Corrosion Studies on Nickel-Silicon Nitride Composite Coatings
作者:
RameshC. S.,
SeshadriS. K.,
IyerK. J. L.,
期刊:
Surface Engineering
(Taylor Available online 1991)
卷期:
Volume 7,
issue 3
页码: 216-220
ISSN:0267-0844
年代: 1991
DOI:10.1179/sur.1991.7.3.216
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractThe electrochemical behaviour of sediment electrodeposited nickel-silicon nitride composite coatings on mild steel has been studied. These composite coatings provide better corrosion resistance in both 3.5% NaCl and 0.5M H2SO4solution than nickel coatings. The higher the percentage of silicon nitride in the composite, the better is the corrosion resistance. Microstructural studies on these composite coatings have revealed the retention of silicon nitride particles in the coating after corrosion tests, which was indicative of very little or no galvanic corrosion. A reduced tendency to pitting of the composite coatings as compared to nickel coatings was also observed. X-ray analysis of composite coatings exposed to 0.5M H2SO4revealed the presence of silicon dioxide in them, leading to enhanced passivation of the composite coatings with respect to pure nickel.
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