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Dissertations / Theses on the topic 'Magnesium alloys Surfaces'

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Published: 10 December 2022

Last updated: 31 July 2025

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1

Wong, Hoi-man, and 黃凱文. "Surface modification of biodegradable metallic material." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41290689.

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2

Tang, Caixian. "Soldering in magnesium high pressure die casting and its preservation by surface engineering." Swinburne Research Bank, 2007. http://hdl.handle.net/1959.3/22747.

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Thesis (PhD) - Swinburne University of Technology, Industrial Research Institute Swinburne - 2007.<br>[A thesis submitted] for the degree of Doctor of Philosophy, Industrial Research Institute, Swinburne University of Technology - 2007. Typescript. Includes bibliographical references (p. 154-167).

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3

Baliga, Chaitanya B. "Bulk and surface studies of rapidly solidified Mg Al alloys." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843174/.

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The effect of aluminium additions on the structure and morphology of the corrosion products formed on the surfaces of rapidly solidified Mg-Al alloy splats immersed at room temperature in a solution of 3%NaCl saturated with Mg(OH)2; has been studied under different analytical techniques. The adverse effect of contamination from copper particles during processing on the corrosion behaviour of the alloys is also highlighted. Aluminium additions were beneficial to the corrosive behaviour of the alloys with a marked improvement in their anti-corrosion resistance occurring in alloys containing more

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4

Wong, Hoi-man. "Surface modification of biodegradable metallic material." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41290689.

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5

Xin, Yunchang. "Degradation mechanism and surface modification of biomedical magnesium alloy /." access full-text access abstract and table of contents, 2010. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ap-b30011723f.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2010.<br>"Submitted to Department of Physics and Materials Science in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references.

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6

KUPFER, JOHN CARLTON. "A SEARCH FOR CHANGES IN THE BAND STRUCTURE OF EXTREMELY STRAIN-FREE MAGNESIUM-CADMIUM CRYSTALS AS A FUNCTION OF ALLOYING, IN THE DILUTE LIMIT (DE HAAS-VAN ALPHEN, FERMI SURFACE)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187953.

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We report here a study of a specific doublet of de Haas-van Alphen frequencies in pure Mg and very dilute Mg(Cd) alloys with the magnetic field aligned with the c-axis. The work involved three stages. First, the use of extremely strain-free crystals, temperatures down to 40 millidegree Kelvin, large amplitude modulation, and the fast Fourier transform allowed the components of this doublet to be well resolved. This resolution allowed measurement of the changes in the cross-sectional area as a function of magnetic field orientation to verify the assignment of this doublet to the cap and monster

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7

Diplas, Spyridonas. "Bulk surface studies of vapour deposited Mg-V and Mg-Zr alloys." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/844498/.

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Mg-V and Mg-Zr alloys with nominal compositions 1, 6, 17.5, 27 wt% V and 2, 8.6 and 10.6 wt% Zr respectively were produced by PVD. All deposits exhibited compositional inhomogeneity, columnar microstructures and a strong basal texture. The solid solubilities of V and Zr in Mg were extended approximately to 17 wt% V and 10 wt% respectively. Grain refinement occurred with increasing solute content. The solid solution break up temperature decreased as the V and Zr content in the alloys increased. Pure V precipitated when the extended solid solubility of was exceeded. Both c and a lattice paramete

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8

Bhat, Panemangalore Devadas. "Development of magnesium-based alloys for biomedical applications." Thesis, Lille, 2019. http://www.theses.fr/2019LIL1R002.

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Étant donné leur capacité à se dégrader à l'intérieur du corps, les implants biodégradables ont fait l'objet de nombreuses recherches médicales. Parmi tous les matériaux, c'est le magnésium, un élément indispensable du corps humain, qui conduit aux résultats les plus favorables car son module d'Young est similaire à celui de l'os. De ce fait, les méthodes adoptées afin d'améliorer le comportement du magnésium pur vis-à-vis de la corrosion sont les suivantes: a)Ajout d'éléments d'alliage comme le zinc, le calcium et l'erbium (Mg-2Zn-2Er, Mg-2Zn-0.6Ca-1Er, etc.) pour contrôler le comportement de

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9

Bhat, Panemangalore Devadas. "Development of magnesium-based alloys for biomedical applications." Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR002.

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Étant donné leur capacité à se dégrader à l'intérieur du corps, les implants biodégradables ont fait l'objet de nombreuses recherches médicales. Parmi tous les matériaux, c'est le magnésium, un élément indispensable du corps humain, qui conduit aux résultats les plus favorables car son module d'Young est similaire à celui de l'os. De ce fait, les méthodes adoptées afin d'améliorer le comportement du magnésium pur vis-à-vis de la corrosion sont les suivantes: a)Ajout d'éléments d'alliage comme le zinc, le calcium et l'erbium (Mg-2Zn-2Er, Mg-2Zn-0.6Ca-1Er, etc.) pour contrôler le comportement de

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10

Reis, Bárbara Araújo dos. "Avaliação das propriedades de superfície de ligas de titânio anodizadas com elementos bioativos /." Araraquara, 2018. http://hdl.handle.net/11449/153482.

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Orientador: Luis Geraldo Vaz<br>Resumo: O titânio comercialmente puro e suas ligas vêm sendo amplamente utilizados para confecção de implantes dentários e ortopédicos devido à adequada resistência mecânica, resistência à corrosão e biocompatibilidade. Entretanto, para aprimorar o tratamento com o uso de implantes, novas ligas e novos tratamentos de superfície vêm sendo pesquisados. A técnica de funcionalização de superfície, baseada em processos úmidos, é amplamente utilizada para desenvolver superfícies a base de óxido de titânio que induza e aumente a osseocondução. Assim, o objetivo deste e

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11

Kecik, Deniz. "Ab Initio Design Of Novel Magnesium Alloys For Hydrogen Storage." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609722/index.pdf.

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A candidate hydrogen storing material should have high storage capacity and fast dehydrogenation kinetics. On this basis, magnesium hydride (MgH2) is an outstanding compound with 7.66 wt % storage capacity, despite its slow dehydriding kinetics and high desorption temperature. Therefore in this study, bulk and surface alloys of Mg with improved hydrogen desorption characteristics were investigated. In this respect, formation energies of alloyed bulk MgH2 as well as the adsorption energies on alloyed magnesium (Mg) and MgH2 surface structures were calculated by total energy pseudopotential meth

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12

Wu, Tso-chang. "Laser Surface Modification of AZ31B Mg Alloy Bio-Implant Material." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248459/.

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Magnesium and its alloys are considered as the potential biomaterials due to their biocompatibility and biodegradable characteristics but suffer from poor corrosion performance. Various surface modification techniques are employed to improve their corrosion resistance. In present case, laser surface melting was carried out on AZ31B Mg alloy with various laser energy densities using a continuous wave ytterbium laser. Effect of laser treatment on phase and microstructure evolution was evaluated by X ray diffraction and scanning electron microscopy. Multi-physics thermal model predicted time temp

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13

Córdoba, Román Laura Catalina. "Magnesium-based biodegradable materials : from surface functionalization to cellular evaluation." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066237/document.

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Les alliages de Magnésium (Mg) sont une nouvelle génération de matériaux biodégradables ayant une bonne ostéointégration et un module d'élasticité similaire à celle de l'os humain. Ces propriétés rendent ces matériaux attrayant pour produire des implants temporaires pour la réparation osseuse. Toutefois, les alliages Mg se dégradent rapidement in vivo, rendant nécessaire de contrôler leur vitesse de corrosion pour accompagner la régénération tissulaire. Parmi les approches proposées pour réduire la corrosion et la biocompatibilité des alliages Mg, les plus utilisées sont les couches de convers

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14

Amruthaluri, Sushma. "An Investigation on Biocompatibility of Bio-Absorbable Polymer Coated Magnesium Alloys." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1742.

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Advances in biomaterials have enabled medical practitioners to replace diseased body parts or to assist in the healing process. In situations where a permanent biomaterial implant is used for a temporary application, additional surgeries are required to remove these implants once the healing process is complete, which increases medical costs and patient morbidity. Bio-absorbable materials dissolve and are metabolized by the body after the healing process is complete thereby negating additional surgeries for removal of implants. Magnesium alloys as novel bio-absorbable biomaterials, have attrac

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15

Córdoba, Román Laura Catalina. "Magnesium-based biodegradable materials : from surface functionalization to cellular evaluation." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066237.pdf.

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Les alliages de Magnésium (Mg) sont une nouvelle génération de matériaux biodégradables ayant une bonne ostéointégration et un module d'élasticité similaire à celle de l'os humain. Ces propriétés rendent ces matériaux attrayant pour produire des implants temporaires pour la réparation osseuse. Toutefois, les alliages Mg se dégradent rapidement in vivo, rendant nécessaire de contrôler leur vitesse de corrosion pour accompagner la régénération tissulaire. Parmi les approches proposées pour réduire la corrosion et la biocompatibilité des alliages Mg, les plus utilisées sont les couches de convers

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16

Al, Rais Masood. "Effects of hydrogen in an aluminium-magnesium-silicon alloy during the production of extrusion ingots." Thesis, Brunel University, 1995. http://bura.brunel.ac.uk/handle/2438/5020.

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Hydrogen causes defects, for which aluminiurn alloy products are rejected. The behaviour of hydrogen in aluminium-magnesium-silicon alloy extrusion ingots, has been studied throughout the course of manufacture from freshly reduced aluminium. It is shown that hydrogen in the liquid metal is produced by temperature-dependent reaction between the metal and water vapour in the atmosphere. As the metal is received from the reduction cells, its temperature is -850 'C and its hydrogen content, >0.4 cm3/100 g, is too high for casting sound ingots. The metal is transferred first to a so-called melting

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17

ZANOTTO, Federica. "CORROSION BEHAVIOUR OF THE AZ31 MAGNESIUM ALLOY AND SURFACE TREATMENTS FOR ITS CORROSION PROTECTION." Doctoral thesis, Università degli studi di Ferrara, 2010. http://hdl.handle.net/11392/2389286.

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Nowadays environmental conservation forces the transportation industry to manufacture lighter and low emissions transport vehicles. In this contest, magnesium alloys have found increasing attention by the automotive industry because of their low density associated with good mechanical properties. However the low corrosion resistance of magnesium alloys in wet environments is still a limiting factor against their widespread diffusion. The aim of this research is both studying the correlation between microstructure and corrosion behaviour of a AZ31 magnesium alloy and developing eco-friendly pr

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18

Rampton, Travis Michael. "Deformation Twin Nucleation and Growth Characterization in Magnesium Alloys Using Novel EBSD Pattern Analysis and Machine Learning Tools." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/4451.

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Deformation twinning in Magnesium alloys both facilitates slip and forms sites for failure. Currently, basic studies of twinning in Mg are facilitated by electron backscatter diffraction (EBSD) which is able to extract a myriad of information relating to crystalline microstructures. Although much information is available via EBSD, various problems relating to deformation twinning have not been solved. This dissertation provides new insights into deformation twinning in Mg alloys, with particular focus on AZ31. These insights were gained through the development of new EBSD and related machine l

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19

Pu, Zhengwen. "CRYOGENIC MACHINING AND BURNISHING OF AZ31B MAGNESIUM ALLOY FOR ENHANCED SURFACE INTEGRITY AND FUNCTIONAL PERFORMANCE." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/5.

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Surface integrity of manufactured components has a critical impact on their functional performance. Magnesium alloys are lightweight materials used in the transportation industry and are also emerging as a potential material for biodegradable medical implants. However, the unsatisfactory corrosion performance of Mg alloys limits their application to a great extent. Surface integrity factors, such as grain size, crystallographic orientation and residual stress, have been proved to remarkably influence the functional performance of magnesium alloys, including corrosion resistance, wear resistanc

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20

Alias, Juliawati. "The influence of Hot Forming-Quenching (HFQ) on the microstructure and corrosion performance of AZ31 magnesium alloys." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-hot-formingquenching-hfq-on-the-microstructure-and-corrosion-performance-of-az31-magnesium-alloys(01193b94-bcbd-452a-a4cb-2d2e93cd1afd).html.

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The hot forming-quenching (HFQ) process has introduced grains and subgrain growth, accompanied with modification of the intermetallic particle distribution in AZ31 magnesium alloys. Each region of the HFQ component represents significant grain structure variation and surface conditions that contributed to the corrosion susceptibility. The homogeneous grain structure significantly ruled the corrosion propagation features by filiform-like corrosion. Immersion of AZ31 alloys in 3.5 wt.% NaCl indicated higher corrosion rate of HFQ TRC (corrosion rate: 10.129 mm/year), a factor of 10 times, higher

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21

Gawlik, Marcjanna Maria [Verfasser]. "The influence of surface defects on the degradation behaviour of magnesium alloys for medical applications / Marcjanna Maria Gawlik." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/119008662X/34.

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22

Jay, Olivier. "Magnesium for biomedical applications as degradable implants : thermomechanical processing and surface functionalization of a Mg-Ca alloy." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI104/document.

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Depuis la dernière décennie, les implants dégradables pour fixation de fracture connaissent un intérêt grandissant. Parmi tous les matériaux, le magnésium apparait comme un candidat prometteur dû à une combinaison unique de propriétés. Le magnésium est très bien toléré par le corps, il a une tendance naturelle à la dégradation et son faible module élastique peut aider à réduire le stress-shielding durant la reconstitution de l'os. Cependant, une combinaison optimale entre les propriétés mécaniques et la vitesse de dégradation doit être obtenue. Le calcium étant biocompatible et procurant diffé

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23

Bergstedt, Edwin. "A Study in How Welding Parameters Affect the Porosity in Laser Welded High Pressure Die Cast AM50 Magnesium Alloy." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291119.

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There are a need for reducing the weight of vehicles, one solution is to implement cast lightweight materials such as the high pressure die cast AM50 magnesium alloy. The weldability of this cast alloy is poor and to implement the use of the alloy commercially a welding process is needed that limits the porosity of the weld. The aim of this thesis is to study the effect of the welding parameters on the porosity in the weld, for three laser welding methods. The welding methods examined are single spot and twin spot laser using either a beam splitter or separate optics. The microstructure of the

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24

Mohammed, Ibrahim Jamesh. "Plasma surface modification of degradable magnesium alloy and non degradable stainless steel: enhanced corrosion resistance, antimicrobial properties, cytocompatibility and covalent immobilization of protein molecules." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13366.

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Surface modification is the viable approach to improve the surface properties of the biomaterials. Plasma treatments used in this thesis are plasma ion implantation, cathodic arc deposition and plasma assisted chemical vapor deposition (PACVD) which is explained detail in chapter (c) 1. Mg alloys possess good mechanical properties and degrades in physiological environment which makes them attractive biodegradable biomaterials. However, their degradation rate is rapid. In c 2, we investigate the corrosion behavior of WE43 and ZK60 Mg alloys in Ringer's solution and simulated body fluids (SBF).

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Ho, Yee Hsien. "In Vitro Behavior of AZ31B Mg-Hydroxyapatite Metallic Matrix Composite Surface Fabricated via Friction Stir Processing." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc862762/.

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Magnesium and its alloys have been considered for load-bearing implant materials due to their similar mechanical properties to the natural bone, excellent biocompatibility, good bioactivity, and biodegradation. Nevertheless, the uncontrollable corrosion rate in biological environment restrains their application. Hydroxyapatite (HA, Ca10(PO4)6(OH)2) is a widely used bio-ceramic which has bone-like mineral structure for bone fixation. Poor fracture toughness of HA makes it not suitable for load-bearing application as a bulk. Thus, HA is introduced into metallic surface in various forms for impro

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26

Wahman, Clarence. "Corrosion of additively manufactured magnesium alloy WE43 : An investigation in microstructure and corrosion properties of as built samples manufactured with Powder Bed Fusion-Laser Beam." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448525.

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The work presented in this thesis was conducted at Uppsala University and at Swerim AB. The study aims to broaden the knowledge about the corrosion of additively manufactured bioresorbable alloy WE43 in humanlike conditions for future applications. Biodegradable metal implants are implants meant to stay in the body and support the wounded bone for a certain time period, and then degrade as new, healthy bone forms in its place. Magnesium alloys have properties that are desired for these kind of implants as it is biodegradable, non-toxic and matches the mechanical properties of bone. Furthermore

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Albo, Zieme Louise, and Pontus Bergstedt. "A pre-study for functional coatings evaluated on light metals to be applied on a new HPDC Mg-alloy : Investigating tribological and thermophysical properties, as-cast and coated." Thesis, Jönköping University, JTH, Industriell produktutveckling, produktion och design, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-53096.

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Magnesium with two-thirds of the density compared to aluminium and one-quarter of steel, intrigues product developers and material scientists due to the light metal’s excellent combination of strength to weight ratio as well as their capability of being produced as a High Pressure Die Cast component compared to other ferrous or light metal alloys. However, a magnesium alloy inherits some concerning drawbacks, limiting the exploitation in structural applications and mechanical design such as automotive, heavy machinery and aerospace components. The need for a magnesium alloy that could withst

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28

Ghaffari, Tari Dariush. "Room and Elevated Temperature Constitutive Response of Polycrystalline Materials Exhibiting Tension-Compression Asymmetry under Monotonic Loading." Thesis, 2014. http://hdl.handle.net/10012/8432.

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A continuum plasticity yield function is developed that captures tension/compression asymmetry and its evolution as exhibited by HCP materials such as magnesium alloy sheet. The model, referred to herein as “CPB06ex3ev”, is based upon the CPB06 [1] yield surface which is extended in this research to consider evolution of asymmetry and anisotropy under monotonic loading. The model is further modified to incorporate thermal softening and strain rate effects. Mechanical characterization experiments are performed to acquire uniaxial tensile and compressive stress-strain data along a range of in-p

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29

Chen, Yuan-Ming, and 陳遠銘. "Electrochemical Surface Treatment of Magnesium Alloys." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/91594123739413034244.

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碩士<br>明志科技大學<br>化工與材料工程研究所<br>97<br>Effects of electrolyte composition, pH, potential and reaction time applied during anodizing, corrosion of anodic films formed on AZ91D magnesium alloy were investigated in this study. Corrosion potential of Mg alloy was examined by current-potential relationship. Microstructures of Mg alloy and anodic film were examined by optical microscopy; the gloss of anodic film was determined by gloss meter; the surface roughness of anodic film was determined by surface roughness tester and atomic force microscope (AFM). Protection of anodized film was evaluated by el

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Rapheal, George. "Corrosion And Wear Behaviour of Plasma Electrolytic Oxidation And Laser Surface Alloy Coatings Produced on Mg Alloys." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2716.

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In the present investigation, surface coatings employing laser surface alloying (LSA) and plasma electrolytic oxidation (PEO) processes have been prepared on Mg alloys. The coatings have been investigated for corrosion and wear behaviour. Two important Mg alloys based on Mg–Al system were selected namely, MRI 230D and AM50 as substrates. LSA coatings have been prepared employing Al and Al2O3 as precursors using different laser scan speeds. PEO coatings were prepared in standard silicate and phosphate based electrolytes employing unipolar, pulsed DC. Hybrid coatings using a combination of the t

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Rapheal, George. "Corrosion And Wear Behaviour of Plasma Electrolytic Oxidation And Laser Surface Alloy Coatings Produced on Mg Alloys." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2716.

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In the present investigation, surface coatings employing laser surface alloying (LSA) and plasma electrolytic oxidation (PEO) processes have been prepared on Mg alloys. The coatings have been investigated for corrosion and wear behaviour. Two important Mg alloys based on Mg–Al system were selected namely, MRI 230D and AM50 as substrates. LSA coatings have been prepared employing Al and Al2O3 as precursors using different laser scan speeds. PEO coatings were prepared in standard silicate and phosphate based electrolytes employing unipolar, pulsed DC. Hybrid coatings using a combination of the t

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32

Garcia, Mónica Pereira. "Biological response to surface modified magnesium alloys-based biodegradable implants." Doctoral thesis, 2016. https://repositorio-aberto.up.pt/handle/10216/83539.

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Garcia, Mónica Pereira. "Biological response to surface modified magnesium alloys-based biodegradable implants." Tese, 2016. https://repositorio-aberto.up.pt/handle/10216/83539.

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張景翔, Ching-Hsiang Chang, and 張景翔. "Surface Processing of Magnesium Alloy in Organic Acid Solutions." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/92086828605214117579.

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碩士<br>淡江大學<br>化學工程與材料工程學系碩士班<br>98<br>In the trend of lightweight and energy-saving demands, magnesium alloys become important materials. However, magnesium alloys are susceptible to corrosion and this has limited the wide-spread application. Then a number of coating or surface processing for magnesium and its alloy are studied. This work used A and B to remove impurities and to level surface of magnesium alloys, AZ31; immersion, ultrasonic treatment or chemical mechanical polishing were conducted. The experimental results show that the removal amount of magnesium alloys was more in B than tha

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Chen, Kung-Liung, and 陳光亮. "An investigation of copper electroplating on surface of magnesium and its alloys." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/45128813147978998961.

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Tsai, Hao-Jan, and 蔡浩然. "The Heat Treatment & Surface Treatment of AZ91D Magnesium Alloy." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/spjz4t.

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碩士<br>國立東華大學<br>材料科學與工程學系<br>95<br>AZ91D has higher content of aluminums, it can precipitate the β phase(Al12Mg17) of BCC structure in the magnesium base of HCP with the proper heat treatment. Because of this precipitates are located slip plane（0001）under the room temperature, this kind of precipitates can not resisted the dislocation to slide very effective and it caused the purpose of precipitation hardening are very limited. In consequence, this study will use the different heat treatment ways which like T6 treatment（solid solution＋aging hardening）、T8 treatment（solid solution＋TMT＋aging

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Chen, Bo-you, and 陳柏佑. "Surface Hardness Improvement in Magnesium Alloy byMetallic-Glass Sputtered Film." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/06128961540532745719.

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碩士<br>國立中山大學<br>材料與光電科學學系研究所<br>99<br>The Pd77Cu6Si17 (PCS) thin film metallic glasses (TFMGs) with high glass forming ability and hardness are selected as a hard coating for improving the surface hardness of the AZ31 magnesium alloy. Both micro- and nano-indentation tests are conducted on the specimens with various PCS film thicknesses from 30 to 2000 nm. The apparent hardness and the relative indentation depth (β) are integrated by a quantitative model. The involved interaction parameters and relative hardness values are extracted from iterative calculations. According to the results, surfac

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Chen, Jie-Ming, and 陳介銘. "Preparation of Magnesium-Substituted Hydroxyapatite Powder and Coating on Magnesium Alloy AZ91 Surface by the Hydrothermal Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/49qq8c.

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碩士<br>國立虎尾科技大學<br>材料科學與綠色能源工程研究所<br>100<br>This study is divided into two parts. First, using dicalcium phosphate dehydrate (CaHPO4‧2H2O, DCPD) and Calcium Hydroxide (Ca(OH)2) as starting material, mixed with DI water. The Ca/P ratios in the starting slurry was 1.67. This study intends to optimize the synthesis parameters of hydroxyapatite (HAp) powders by hydrothermal method. All conditions of HAp powder prepared by this method is composed of sheet particle with size about 20 to 70μm. The optimized synthesized of HAp powder without magnesium doping at 175℃ for 20 hours has best crystallinity

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Liu, Gang-Wei, and 劉剛瑋. "A study of connecting surface-treated aluminum-magnesium alloy 5052 with plastics." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/v74tjf.

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碩士<br>國立臺北科技大學<br>資源工程研究所<br>100<br>A study of fixing plastics to an aluminum-magnesium alloy 5052. First, the aluminum-magnesium alloy 5052 was surface-treated via electropolishing reaction. While the surface roughness of the aluminum-magnesium alloy 5052 was 16.3 mm before electropolishing, the roughness of the electropolished surface was 3.1 nm. We find that the surface morphology was uniform. The aluminum-magnesium alloy 5052 was further surface-treated via anodic treatment. After that, we observed self-organized formation of nanopores arrays in aluminum-magnesium alloy 5052, and the diame

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Bing-Ci, Shih, and 施並奇. "Micro-Arc Oxidation Surface Treatment of AZ31 Magnesium Alloy for Enhancing Osseointegration." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/57325062510574467094.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>102<br>This study aims to utilize surface modified technology to manufacture medical magnesium alloy implant with uniform biodegradation and bone healing advantages which break through the current medical magnesium alloy technical obstacles: biodegradation rate unbalance and biodegradation speed problems. Furthermore, it can promote bone healing and also making a progress for medical material research of magnesium alloy. Research paper is divided into two parts: the first part is research micro-arc oxidation technologycan control and uniform degradable magnes

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Lee, Ya-Ju, and 李雅茹. "Effect of Cold-Spray Treatment on Surface Properties of AZ80 Magnesium Alloy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/32726028278919498101.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>100<br>It is commonly recognized that magnesium possesses poor corrosion resistance because of its high oxidation potential and porous oxide structure. The corrosion resistance is the most important topic for magnesium alloys application. The thesis aims to investigate how cold spray influences the properties of magnesium alloy, including microstructure, mechanical and corrosion property. The sprayed substrate is AZ80 magnesium alloy. IN625, 301 stainless steel and aluminum powder is used to spraying on the surface. In the study, the coating formed by cold spray

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Wang, Tsung-Hsing, and 王宗薪. "Development and study of copper electrodeposition on the surface of the magnesium alloy." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23979991401152526351.

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博士<br>長庚大學<br>機械工程研究所<br>96<br>Owing to high specific strength and low density, magnesium alloys have been widely applied as the construction materials in 3C products, automobile and leisure products. However, surface treatments and coatings are needed for the magnesium alloys, because of their low corrosion resistance. In this study, an environmental-friendly alkaline copper-sulfate electroplating bath was proposed for obtaining a well adherent copper deposit on pure magnesium and its alloys (AZ31, AZ61 and AZ91). The copper-deposited magnesium specimens would be further electroplated in acid

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Chu, Chi-Hua, and 朱紀華. "The Improvement of Surface Roughness and Corrosion Resistance for Biodegradable AZ61 Magnesium Alloy." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/15380113027554326577.

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碩士<br>國立成功大學<br>製造資訊與系統研究所<br>102<br>In biomaterials , the mechanical properties of magnesium alloy is closest to human bone. In addition, its excellent of biodegradablility tends to be more appropriate than Titanium and Cobalt-chromium. Besides, it could decrease the damage to the human body through its degradation to motivate osteoclasts activity and it is decomposable to digestive system. Nevertheless, magnesium is susceptible to corrosion as revealed by experiments using simulation liquid immersing or clinic. Meanwhile, it could reflect resistance reaction from human body. The fast degrada

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Li, Wei-Cheng, and 李偉誠. "The Influence of Different Cobalt Electrolyte on Magnesium Alloy Coating Surfaces by Micro-Arc Oxidation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5za3tx.

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碩士<br>龍華科技大學<br>化工與材料工程系碩士班<br>107<br>Magnesium alloys have been widely used in 3C products, automotive industry and leisure products due to their low density, heat resistance and heat dissipation. Most of the AZ series of magnesium alloys are favored on the market, but magnesium alloys have high chemical activity and are prone to corrosion in the atmosphere, which makes magnesium alloys extremely limited in application. Surface treatment is one of the methods to effectively improve the corrosion resistance of magnesium alloys. Therefore, this study used micro-arc oxidation technology to prepa

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Lai, Yen-Tze, and 賴延則. "The Study of Corrosion Resistance on the Surface of ZK60 Magnesium Alloy Formed by MAO." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/33803835571763218133.

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碩士<br>龍華科技大學<br>化工與材料工程系碩士班<br>104<br>In all metal materials, magnesium is the most chemically active. Oxidation can occur at room temperature. But magnesium oxide film is porous and corrosion resistance is poor. Poor corrosion resistance limits the development of magnesium alloy.; therefore, the magnesium alloy surface treated to enhance corrosion resistance is significant. This study attempts to use micro arc oxidation method to fabricate the micro-arc oxidation coating to improve the corrosion resistance of magnesium alloy. This study was proceeded by changing the different power modes (DC,

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Ho, Jen-Chih, and 何仁智. "Study on the Corrosion Resistance of AZ31 Magnesium Alloy with Micro-Arc Oxidation Surface Treatment." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50289834341633344088.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>101<br>This study uses micro-arc oxidation process to improve the corrosion quality of magnesium alloy AZ 31, the solution for this process consists of 60 g/L of silicate, 80 g/L of citrate, 70 g/L of NaOH and 20 g/L of phosphate. In order to find the optimal treatment condition for improving the impedance resistance of the oxide film , the oxide films formed on the substrate under different solution temperature, working voltage, and treatment time are investigated, the results indicate that 30℃, 90V, and 15 min is the optimum operation parameter. The oxide fi

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Lee, Hsien-Hsueh, and 李咸學. "Application of the Solders with Magnesium Alloy to Joining and to Surface Metallization of Alumina." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/92433261447935595541.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>97<br>In this study, Sn3Ag0.5Cu lead-free solder with the addition of magnesium alloy was developed and used to join ceramics. The active solders can wet the ceramics at low temperature (<250℃) in air. Thus, the soldering process can be applied to metallize the ceramics for electric and heat conduction and electroplating. The addition of magnesium from 1wt% to 2.6wt% into the Sn3Ag0.5Cu alloy caused decreasing the liquidus from 220.2℃ to 207.8℃. An addition of AZ31 magnesium alloy into the Sn3Ag0.5Cu alloy would form (Ag,Mg)3Sn and Mg2Sn intermetallic compounds. T

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Da-JunLin and 林大鈞. "The effect of surface treatment on the biocompatibility and corrosion resistance of biodegradable AZ61 magnesium alloy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/81433935362164024805.

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碩士<br>國立成功大學<br>生物醫學工程學系<br>100<br>Magnesium (Mg) and its alloys are new biomaterials which have been studied recently for hard-tissue replacement. The advantages of magnesium alloy compared to other metal traditionally used in implant, such as stainless and titanium alloy. Magnesium alloy have good mechanical properties and biodegradable. In addition, magnesium is an essential component in human metabolism, and magnesium is known to play an important role in the bone formation. However, owing to high electrochemical corrosion, the poor corrosion resistance of magnesium alloy hinders their use

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Szu-JungPan and 潘思蓉. "Co-electrodeposition Behavior and Material Characterization of AlZn Coatings Formed in Ionic Liquid on AZ91D Magnesium Alloy Surface." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/68220355549141159647.

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Da-JunLin and 林大鈞. "Effects of Microstructure Modification and Surface Treatment on the Biodegradable Characteristics and Biocompatibility of Bio-Magnesium-Zinc alloy." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/hx59pd.

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