Influence of surface pretreatment on phosphate conversion coating on AZ91 Mg alloy

Journal article (2019)

Authors

Chunyan Zhang Chinese Academy of Sciences, Harbin Engineering University
B. Liu Harbin Engineering University
Baoxing Yu Chinese Academy of Sciences
Xiaopeng Lu Northeastern University China
Yong Wei Harbin Engineering University
Tao Zhang Harbin Engineering University, Northeastern University China, Chinese Academy of Sciences
J.M.C. Mol (OLD) MSE-6
Fuhui Wang Northeastern University China
Research Group
(OLD) MSE-6
Copyright: © 2019 Chunyan Zhang, Bin Liu, Baoxing Yu, Xiaopeng Lu, Yong Wei, Tao Zhang, J.M.C. Mol, Fuhui Wang
DOI: https://doi.org/10.1016/j.surfcoat.2018.12.091
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Published Date

2019

Language

English

Research Group

(OLD) MSE-6

Abstract

Surface pretreatment is generally applied before application of protective coatings on Mg alloys, which influences surface microstructure and electrochemical activity of the substrate and has an effect on the coating properties. The effect of various pretreatment processes (sand-blasting, grinding and polishing) on the microstructure and corrosion protection performance of phosphate conversion coating (PCC) on AZ91D Mg alloy was investigated in the present study. Sand-blasting cleaning significantly increases the surface roughness and electrochemical activity of the substrate, leading to formation of a porous PCC with inferior corrosion protection performance. In the case of ground/polished Mg alloy, the uniformity and corrosion resistance of the resultant conversion coating are mainly related to the surface roughness. Relatively low surface roughness of the substrate facilitates formation of a corrosion protective PCC.

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