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Microstructure and corrosion resistance of Ni–P gradient coating/stannate conversion film on magnesium alloy

Published online by Cambridge University Press:  15 February 2019

Xiao-jia Liu
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
Wan-chang Sun*
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
Ya-ru Dong
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
Min Ma
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
Ya-gang Zhang
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
Fei Yang
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
Yu-yao Ruan
Affiliation:
College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: sunwanchang@tsinghua.org.cn
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Abstract

A kind of novel Ni–P gradient coating/stannate conversion film was deposited on AZ91D magnesium alloy (AZ91D alloy) by an integrative method involved stannate conversion and electroless plating. The results indicated that using sodium hypophosphite concentrations varied as 5, 10, 22, 46, and 60 g/L in the bath, the electroless Ni–P gradient coating with typical cell morphologies was successfully prepared, and the structures transited from crystalline → microcrystalline → amorphous were obtained as increasing P content from 3.31 to 12.58 wt%. Furthermore, the corrosion morphologies, polarization curves, and the electrochemical impedance spectroscopy result indicated that the corrosion resistance of AZ91D alloy substrate was significantly improved and the corrosion resistance of Ni–P gradient coating was superior than that of stannate conversion film, which might be attributed to the gradient structure and rising P content with unique function.

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Article
Copyright
Copyright © Materials Research Society 2019 

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