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Dissertations / Theses on the topic 'Ni-P alloy coatings'

Author: Grafiati
Published: 6 September 2023

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1

Buchtík, Martin. "Příprava povlaků na bázi Ni-P na tvářených hořčíkových slitinách." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240523.

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The aim of this diploma thesis was summary of all steps and knowledge necessary to deposition of quality Ni-P coatings deposited on wrought magnesium alloys AZ31 and AZ61. There is the treatise about wrought magnesium alloys AZ31 and AZ61. Thesis includes its phase composition in the theoretical part. There are given its possible processing methods too. Next, there is desribed the mechanism of deposition of Ni-P coatings, components required to electroless deposition and factors affecting the quality and properties of these coatings. The theoretical part is ended by serie of reviews. Authors o
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2

Zahálka, Martin. "Galvanické pokovování hořčíkové slitiny s Ni-P bond coat." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401926.

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Cílem této diplomové práce jse najít nejnižší možnou tloušťku nikl-fosforového povlaku, který může být galvanicky pokoven mědí bez defektů na horčíkové slitině, nikl-fosforového nebo měděného povlaku. V teoretické části jsou shrnuty poznatky o hořčíkových slitinách a jejich korozi. Navíc se teoreticá část zaměřuje na popis procesu bezproudého niklování a elektrochemického pokovování mědí a jejich porovnání. Na konci teoretické části je shrnut současný výzkum o elektrochemickém pokovování hořčíkových slitin. V experimentální části byl popsán proces přípravy povlaků Ni-P a Cu na horčíkové slitin
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3

Hsiao, Yu-Cheng, and 蕭又誠. "Microstructure and Characterization ofSputtered Ternary Ni-Ru-P Alloy Coatings." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82863128421470179006.

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碩士<br>國立聯合大學<br>材料科學工程學系碩士班<br>99<br>In the study, the ternary Ni-Ru-P alloy coatings are fabricated by magnetron dual-gun co-sputtering technique. The chemical composition variation of the coatings in terms of sputtering parameters, including input power, process temperatures and Ar gas flow rate are investigated. The Ni-Ru-P coatings with a Ru content <38.9 at.% remain an amorphous/nanocrystalline feature under a vacuum annealing temperature up to 500oC. On the other hand, Ni(Ru) and Ni-P precipitation phases form as annealing temperature is raised to 550oC. With Ru content >52.7 at.%, the a
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4

Huang, Chi-Ming, and 黃琦銘. "Study of Electroless Ni-Mo-P Alloy Coatings on AA5083 Aluminum Alloy and their Wear Corrosion Properties." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83596025698111772888.

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碩士<br>健行科技大學<br>機械工程系碩士班<br>103<br>Ni-Mo-P alloy coatings were deposited on AA5083 aluminum alloy by electroless deposition for wear and corrosion properties. we hope Ni-Mo-P alloy coatings more hard and smooth then before by vacuum heat treatment . The AA5083 aluminum alloy is widely used for many application in automotive , marine , aircraft body sheet due to its excellent combination of strength, corrosion resistance . Research step : 1. Ni-Mo-P and Ni-P coatings were deposited on AA5083 aluminum alloy by electroless deposition . 2. Different temperature and time variables in vacuum heat tr
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5

Ezhiselvi, V. "Development of Corrosion Protective Coating Systems for AZ31B Magnesium Alloy." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3786.

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Magnesium and its alloys are extensively used for various industries such as aerospace, automobile and electronics due to their excellent properties such as low density, high strength and stiffness and electromagnetic shielding. However, the wide spread applications of these alloys are limited due to the undesirable properties such as poor corrosion, wear and creep resistance and high chemical reactivity. These alloys are highly susceptible to galvanic corrosion in sea water environment due to their high negative potential (-2.37 V vs SHE). The effective way of preventing corrosion is through
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6

Ezhiselvi, V. "Development of Corrosion Protective Coating Systems for AZ31B Magnesium Alloy." Thesis, 2016. http://etd.iisc.ernet.in/2005/3786.

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Magnesium and its alloys are extensively used for various industries such as aerospace, automobile and electronics due to their excellent properties such as low density, high strength and stiffness and electromagnetic shielding. However, the wide spread applications of these alloys are limited due to the undesirable properties such as poor corrosion, wear and creep resistance and high chemical reactivity. These alloys are highly susceptible to galvanic corrosion in sea water environment due to their high negative potential (-2.37 V vs SHE). The effective way of preventing corrosion is through
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7

Liu, Jian Hong, and 劉建宏. "Effect of Electroless Ni-P/nano-CNT and Ni-P/nano-TiO2 Composite Coatings on the Wear and Corrosion Characteristics of AA6061 Alloy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/85042963499850268342.

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8

Meshram, Atul P. "Correlation between Morphology, Microstructure and Corrosion Behaviour of Nickel-Phosphorous (Ni-P) Based Electrodeposited Coatings." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6039.

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The Ni-P alloy coatings are widely studied due to their superior mechanical and tribological properties. Ni-P coatings are also considered to be a viable alternative to the chromium (Cr) coatings which utilize environmentally hazardous and toxic carcinogenic electrolytic solutions. The current work focuses on strategies to enhance the corrosion resistance performance of electrodeposited Ni-P coatings primarily by incorporation of foreign additives (carbon nanotubes (CNTs) and graphene) and by engineering of the Ni-P micro-texture and phase fraction (crystalline and amorphous phases). Nickel-ph
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9

Liu, Chen-Wei, and 留振威. "Effect of Electroless Ni-P-Cu Coatings on the Stress Corrosion Cracking Susceptibility of 7075-T6 Aluminum Alloy." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/98447742644803820009.

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碩士<br>健行科技大學<br>機械工程系碩士班<br>103<br>This study used electroless plating process to prepare Ni-P-Cu composite coating on AA7075 aluminum alloy surface after anodizing treatment. The Stress-Corrosion Cracking (SCC) charactenrstics for the coating in 3.5%NaCl aqueous solution via slow strain rate test was also studied. The surface morphology, element composition and surface hardness of the coatings were analyzed by SEM, EDS and Vicker’s hardness tester. The corrosion and wear-corrosion resistance of electrolessplating Ni-P-Cu composite coating in 3.5% NaCl aqueous solution was evaluated, and als
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10

yang, chia-wei, and 楊佳偉. "The study of the Wear-Corrosion Properties of the Electroless Ni-P Nanoparticles Composite Coatings on 5083 Aluminum Alloy." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/92164234861230364188.

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碩士<br>清雲科技大學<br>機械工程研究所<br>98<br>The purpose of this study is to evaluate the corrosion and wear-corrosion resistance properties of electroless Ni/nano-TiO2 and Ni/CNT plated nano-composite coatings on AA5083 alloy in 3.5 wt.% NaCl solution. The nano-composite coatings were prepared by electroless plating method that the nano-TiO2 (15 nm) and Carbon nano-tube (CNT, 5nm) particles were added into the eletroless Ni plating solution with a low and a high concentration of 1 g/L and 10 g/L for comparison, respectively. The corrosion resistance properties of the nano-composite coatings were examined
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11

Chan, Tsung-Yen, and 詹宗諺. "Improved SCC Properties of 70Cu-30Zn Alloy by Electroless Plated Ni-P/nano-TiO2 Composite Coatings in Fluoride Solutions." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97819017844389130659.

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碩士<br>清雲科技大學<br>機械工程所<br>100<br>The present study used electroless plating techniques by adding nano-TiO2 in the plating solution with various concentrations of 1 g/L, 5 g/L, 10 g/L and 15 g/L to form Ni-P/nano TiO2 composite coatings on the 70Cu-30Zn brass alloy substrate. The corrosion resistance behavior was evaluated by potentiodynamic measurement and the susceptibility of the stress corrosion cracking (SCC) was evaluated by slow strain rate test (SSRT) in 0.1 M NaF solution. The surface morphology, element analysis and surface microhardness of the electroless Ni-P composite coatings were
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12

Wu, Chia-Che, and 吳佳哲. "Investigation on Microstructure, Phase Transformation, Thermal Stability, Morphological and Mechanical Characteristics of the Sputtered Binary Ni-Al and Ternary Ni-P-Al Alloy Coatings." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65760556042978923394.

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碩士<br>國立聯合大學<br>材料科學工程學系碩士班<br>97<br>Binary Ni-Al alloy coatings were fabricated by magnetron co-sputtering technique with multi targets of pure Ni and Al metals. The chemical composition variation of the coatings in terms of sputtering input power modulation and substrate deposition temperature variation was investigated. The Ni-Al coatings with Al contents ranged from approximately 2.7 to 62.9 at.% could be manipulated through multi-gun sputtering. The as-deposited Ni-Al coatings possessed crystalline and nano-crystalline microstructures with respect to deposition input powers, substrate tem
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13

Chin, Shu-Chen, and 秦淑珍. "Research on the Wear Corrosion Characterization of 7075 High Strength Aluminum Alloy Surface Electroplating Ni-P-Al2O3 Nano-particles Composite Coatings." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/99199272317344172981.

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碩士<br>清雲科技大學<br>機械工程研究所<br>95<br>This thesis uses electroplating process to prepare Ni-P-Al2O3 composite coating on 7075 Aluminum Alloy surface by means of adding different concentrations of alumina powder (0 g/L to 50 g/L) to Ni plating solution, analysis mechanical properties in addition to evaluate the corrosion and wear-corrosion resistance of electroplating Ni-P-Al2O3 composite coating in 3.5% NaCl solution, also discussing with related micro-structural analysis results. Experimental results indicated that electroplating Ni-P-Al2O3 composite coating high hardness and wear-corrosion resist
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14

Huang, Chang-Chuh, and 黃章智. "Wear and Corrosion Resistance Properties of Electroless Ni-P-Cu/Graphene Composite Coatings Deposited on Aluminum Alloy in 0.5M H2SO4 Solutions." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/53163149895738408512.

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碩士<br>健行科技大學<br>機械工程系碩士班<br>104<br>This study using electroless-plating techniques to deposit the Ni-P-Cu/Graphene composite coatings on AA6061 aluminum alloy substrate after pre-treatment including thermal oxidation or anodizing evaluates the structure, mechanical properties of the composite coatings as well as their corrosion and wear resistance in 0.5M H2SO4 solution. The corrosion resistance behavior of the composite coatings was performed by using electrochemical polarization measurements. The surface morphology and elemental analysis and surface hardness of the composite coatings before
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15

Chou, Hung-Tao, and 周弘道. "Study on the Mechanical Properties of Ni-W-P Alloy Coating Electrodeposited from Modified Watts Bath." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/4ts9qg.

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碩士<br>國立臺北科技大學<br>製造科技研究所<br>101<br>The main purpose of this study is to investigate the effects of various process parameters electrodeposited Ni-W-P alloy on the surface treatment using. The modified Watts bath consisted of nickel sulfate, phosphorous acid and Sodium tungstate solution. The Alpha-Step profilometer, FESEM, XRD were employed for observation and analysis of material microstructure in order to determine the critical factor which inference the coating hardness, such as element content and microstructure of the coating. The experimental results showed that coating hardness, he
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16

Wu, Fan-Bean, and 吳芳賓. "Surface Characteristics, Microstructure, Microhardness, and Strengthening Mechanism of Electroless and Sputtered Ni-P-W Alloy Coating." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/67567123498366371411.

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博士<br>國立清華大學<br>材料科學工程學系<br>91<br>Electroless nickel (EN) deposit is frequently employed for many industrial applications due to its various excellent properties. The electroless Ni-P deposit can be strengthened by the precipitation of Ni-P compounds after heat treatment. Nevertheless, the hardness of Ni-P films degrades with excessive annealing. It is thus critical to increase the crystallization temperature so that the Ni-P deposit can withstand sufficient or even superior hardness at elevated temperatures. To enhance the thermal stability, the addition of a third element in the Ni-P coa
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17

Su, Yu-Ming, and 蘇有銘. "Investigation on Phase Transformation, Thermal Stability, Surface and Mechanical Properties of Sputtering Ni-P-Al Ternary Alloy Coating with Improved High Phosphorus Content Electroplating Ni-P Thick Film Target Design." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/21750804093636050533.

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碩士<br>國立聯合大學<br>材料科學工程學系碩士班<br>96<br>Electroplating Ni–P coatings had been used in various industrial applications due to its excellent corrosion and wear resistance, and mechanical and surface properties. After adequate heat treatment, Ni-P precipitation and Ni crystallization formed, leading to the increase of surface hardness upto 800Hv. For electroplating process, the current density is frequently increased to increase deposition rate. However the irregularity in edge region was significant subsequently, especially on sharp edge geometries. Non-homogeneity in composition and thickness d
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