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Optimization of Process Parameters for Electroless Ni-P Plating on AZ91D Magnesium Alloy by Phosphate Pretreatment

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Abstract:

Electroless nickel plating coatings on AZ91D alloy by phosphate pretreatment were prepared. The coating resembles a cauliflower and is compact. It consists of amorphous Ni-P. Potentiodynamic polarization curves of the Ni-P coatings in 3.5% NaCl show that the electroless Ni-P coating improves the corrosion resistance of AZ91D alloy and the highest corrosion potential reached to -0.513V vs. SCE. The results of the orthogonal experiment of process parameters indicates that temperature 80°C, time 120min and pH 7.5 can be considered as the optimum process parameters for electroless Ni–P plating on AZ91D alloy and pH value in the bath has more effect on corrosion potential than temperature and time.

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Materials Processing Technology, ICAMMP2011 View Preview

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Periodical:

Advanced Materials Research (Volumes 418-420)

Pages:

808-811

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.418-420.808

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Online since:

December 2011

Authors:

Su Qiu Jia, Jing Xin Guan, Zhan Kui Zhao, Hua Chen, Shu Yan Jia

Keywords:

AZ91D, Electroless Ni-P Plating, Optimization, Phosphate Pretreatment

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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