Abstract
Functional performance of components can be increased by the surface coating techniques. Most of the industries need to improve the components performance using several coating techniques. To improve the mild steel surface hardness duplex Ni-P-ZnO/Ni-P-SiC and Ni-P-Al2O3/Ni-P-SiC coatings were tried on it in this investigation. In this study by using dual electroless bath multi-layer coatings is developed. Microhardness of duplex coating measured with assistance of the Vickers microhardness tester. The above mentioned coatings subjected to heat treatment at a temperature of 400oC to enhance the microhardness of the deposit. A comparative study was carried out between both the coatings to know the better alternative to achieve good surface hardness. Results confirm that Ni-P-SiC outer layer duplex coating offers good microhardness. After Heat treatment process, microhardness of the deposit has been increased because of Phase transmission occurs to hard Ni3P from unstructured to structured hard Ni3P.
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