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Corrosion and wear resistant electrodeposited composite coatings

Time:2020-06-16 15:31:35  From:  Author:

 

The need for coatings with improved resistance to highly aggressive environments is high as a result of a growing demand for extended safe service life of industrial objects. In our previous research work the corrosion and wear corrosion resistance of nitrides coatings, (TiCr)N and Ti/TiN PVD coatings, hard chromium coatings,HVOF cermet coatings as well as of composite electrodeposited coatings of nickel and nano-crystals of silicon carbide was studied. The production of nano-composite films can be achieved through electrochemical deposition of the matrix material from a solution containing suspended particles such as: oxides, carbides, nitrides, metal powder and s.a. This technique has been applied in the present work using nanometer size SiC particles for the production of the composite coatings. Ni–SiC composites have been studied extensively and commercialized successfully for the protection of mechanical parts under friction, due to their high wear resistance and the low cost of ceramic powder. The usual dimensions of SiC powder in such applications are in the range of micrometers. The shapes used vary from round to acicular while a mixture of them can also be used. The objective of the present experimental work is the extension of these researches when nano-crystals of silicon carbide (mean diameter 20 nm) are codeposited. Composite electroplating is a method allowing to co-deposit fine particles of metallic or non metallic compounds into the plated layers in order to improve the surface properties. The aim of the present work was to compare the performance of pure nickel and Ni–SiC nano-structured composite coatings as far as corrosion, wear and abrasion resistance were concerned. The characteristics of the coatings were assessed by scanning electron microscopy, micro hardness test, Taber Abrader test, electrochemical impedance spectroscopy and wear corrosion measurements. Additionally accelerated salt spray tests were performed. The results obtained in this study indicate that the co-deposition of nickel and SiC nano-particles leads to uniform deposits possessing better abrasion, wear and corrosion properties.

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