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Studies on Ni-Mo-P Coatings by Electroless Deposition

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Abstract:

This paper describes the performance of Ni-P and Ni-Mo-P alloy coatings deposited by electroless plating on the aluminum alloy 5052 to evaluate the corrosion resistance, thermal stability and electro-conductivity of coating assemblies. Corrosion behaviors of the obtained deposits in a 0.5M H2SO4 environment were investigated. The crystalline state and morphologies of Ni-P and Ni- Mo-P alloys were examined by field emission scanning electron microscopy (FE-SEM). The experimental results indicate that the Ni-Mo-P coating operated at 70°C and pH 9.0 has a nanocrystalline structure and its corrosion resistance in a 0.5M H2SO4 environment can be enhanced by the co-deposition of Mo as compared to Ni-P films. It has also been found that the Ni-Mo-P ternary alloys reveal good thermal stability after annealing at 400°C. Based on the excellent performance of Ni-Mo-P ternary alloys, these alloys have a potential to be applied to precision mould, optical parts mould, and surface metallization of substrates.

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Periodical:

Key Engineering Materials (Volumes 364-366)

Pages:

333-339

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.364-366.333

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Online since:

December 2007

Authors:

Yu Hsien Chou, Ching Yuan Bai, Ming Der Ger, Shuo Jen Lee, Chi Yuan Lee, Chu Lung Chao

Keywords:

Corrosion Resistance, Electroless Plating (EP), Ni-Mo-P Alloys, Surface Treatment, Thermal Stability

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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