Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings
碩士 === 清雲科技大學 === 機械工程研究所 === 93 === Electroless nickel coatings have been widely used in the mechanical, chemical and electronic industries owing to their higher wear, abrasion and corrosion resistance. Electroless nickel composite coatings incorporated with PTFE and /or SiC particles exhibited a s...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | zh-TW |
Published: |
2005
|
Online Access: | http://ndltd.ncl.edu.tw/handle/53365468104384357699 |
id |
ndltd-TW-093CYU00489003 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-093CYU004890032015-12-25T04:10:28Z http://ndltd.ncl.edu.tw/handle/53365468104384357699 Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings 無電鍍鎳陶瓷複合鍍層之磨耗腐蝕研究 cheng-lin chuang 莊政霖 碩士 清雲科技大學 機械工程研究所 93 Electroless nickel coatings have been widely used in the mechanical, chemical and electronic industries owing to their higher wear, abrasion and corrosion resistance. Electroless nickel composite coatings incorporated with PTFE and /or SiC particles exhibited a significantly beneficial effect of impoving mechanical and tribological properties, as well as low surface energy which are desired for anti-sticking and wear resistant applications. However, the wear-corrosion resistance of these composite coating has not been systematically studied and compared. The purpose of this study is to investigate the wear, corrosion and wear-corrosion resistance of electroless nickel composite coatings containing Al2O3 powder additive with different concentration (1~25g/L) and diameter (1μm and 0.3μm), and also adding the diamond powder with different diameter (0~2μm and 0~0.5μm) for compared. Using a block-on ring surface friction method to evaluate the dry wear and wear-corrosion behavior of these composite coatings in air and 3% NaCl solution, respectively. The friction ring counterpart is made of a sintered Al2O3. Electrochemical polarization measurements are performed for analyzing both corrosion and wear-corrosion characteristics under static and wearing conditions, respectively. Surface morphologies, element compositions and surface roughness of the composite coatings before and after all tests are analyzed by scanning electron microscopy (SEM), X-ray energy dispersive analyzer (EDS) and atomic force microscopy (AFM). Also, the surface hardness of these composite coatings is measured by a precision nano-indentation test instrument. The experimental results indicated that all the electroless nickel composite coatings posses a beneficial effect to improve the corrosion protection, wear and wear-corrosion resistance for the AISI 4140 steel substrate. The corrosion resistance of the composite coatings increases with increasing concentration of Al2O3 powder, and a critical concentration of 16.65 g/L) with the maximum corrosion resistance is found, the maximum corrosion resistance value is more significant as less powder diameter, also it is comparable with the diamond powder addition at a concentration of 1.67g/L. The hardness of composite coatings increases with increasing Al2O3 powder concentrations, a critical maximum value of Hv 816 is obtained at concentration of 10 g/L, which also exhibited the best wear-corrosion resistance and its effect is comparable with the diamond powder addition at the concentration of 1.67g/L. Cheng-Kuo Lee 李正國 2005 學位論文 ; thesis 73 zh-TW |
collection |
NDLTD |
language |
zh-TW |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 清雲科技大學 === 機械工程研究所 === 93 === Electroless nickel coatings have been widely used in the mechanical, chemical and electronic industries owing to their higher wear, abrasion and corrosion resistance. Electroless nickel composite coatings incorporated with PTFE and /or SiC particles exhibited a significantly beneficial effect of impoving mechanical and tribological properties, as well as low surface energy which are desired for anti-sticking and wear resistant applications. However, the wear-corrosion resistance of these composite coating has not been systematically studied and compared. The purpose of this study is to investigate the wear, corrosion and wear-corrosion resistance of electroless nickel composite coatings containing Al2O3 powder additive with different concentration (1~25g/L) and diameter (1μm and 0.3μm), and also adding the diamond powder with different diameter (0~2μm and 0~0.5μm) for compared. Using a block-on ring surface friction method to evaluate the dry wear and wear-corrosion behavior of these composite coatings in air and 3% NaCl solution, respectively. The friction ring counterpart is made of a sintered Al2O3. Electrochemical polarization measurements are performed for analyzing both corrosion and wear-corrosion characteristics under static and wearing conditions, respectively. Surface morphologies, element compositions and surface roughness of the composite coatings before and after all tests are analyzed by scanning electron microscopy (SEM), X-ray energy dispersive analyzer (EDS) and atomic force microscopy (AFM). Also, the surface hardness of these composite coatings is measured by a precision nano-indentation test instrument.
The experimental results indicated that all the electroless nickel composite coatings posses a beneficial effect to improve the corrosion protection, wear and wear-corrosion resistance for the AISI 4140 steel substrate. The corrosion resistance of the composite coatings increases with increasing concentration of Al2O3 powder, and a critical concentration of 16.65 g/L) with the maximum corrosion resistance is found, the maximum corrosion resistance value is more significant as less powder diameter, also it is comparable with the diamond powder addition at a concentration of 1.67g/L. The hardness of composite coatings increases with increasing Al2O3 powder concentrations, a critical maximum value of Hv 816 is obtained at concentration of 10 g/L, which also exhibited the best wear-corrosion resistance and its effect is comparable with the diamond powder addition at the concentration of 1.67g/L.
|
author2 |
Cheng-Kuo Lee |
author_facet |
Cheng-Kuo Lee cheng-lin chuang 莊政霖 |
author |
cheng-lin chuang 莊政霖 |
spellingShingle |
cheng-lin chuang 莊政霖 Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
author_sort |
cheng-lin chuang |
title |
Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
title_short |
Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
title_full |
Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
title_fullStr |
Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
title_full_unstemmed |
Study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
title_sort |
study on the wear - corrosion properties of electroless nickel-ceramic composite coatings |
publishDate |
2005 |
url |
http://ndltd.ncl.edu.tw/handle/53365468104384357699 |
work_keys_str_mv |
AT chenglinchuang studyonthewearcorrosionpropertiesofelectrolessnickelceramiccompositecoatings AT zhuāngzhènglín studyonthewearcorrosionpropertiesofelectrolessnickelceramiccompositecoatings AT chenglinchuang wúdiàndùniètáocífùhédùcéngzhīmóhàofǔshíyánjiū AT zhuāngzhènglín wúdiàndùniètáocífùhédùcéngzhīmóhàofǔshíyánjiū |
_version_ |
1718157280722026496 |