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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 6/2019

15-05-2019

The Electrochemical Corrosion Behavior of Plasma Electrolytic Oxidation Coatings Fabricated on Aluminum in Silicate Electrolyte

Authors: Zhong Yang, Rui-qiang Wang, Chen Liu, Ye-kang Wu, Dong-dong Wang, Xin-tong Liu, Xu-zhen Zhang, Guo-rui Wu, De-jiu Shen

Published in: Journal of Materials Engineering and Performance | Issue 6/2019

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Abstract

Plasma electrolytic oxidation (PEO) coatings were fabricated on the aluminum in silicate electrolyte. Microstructures and elemental compositions of these PEO coatings were examined by scanning electron microscopy (SEM) equipped with an energy-dispersive x-ray spectroscopy (EDS). Corrosion resistances of the coated samples were evaluated using the measurements of open-circuit potential (OCP), repetitive polarization and electrochemical impedance spectroscopy (EIS) in 3.5 wt.% NaCl solution. The results indicated that the PEO coatings not only act as a physical shield limiting the penetration of corrosive solution, but also establish an anodic location with high concentration of H+ ions and other product ions as pitting corrosion begins. With the development of pitting corrosion, the accumulation of corrosion products inside the pits and pores of the coatings decreases the corrosion process effectively.
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Metadata
Title
The Electrochemical Corrosion Behavior of Plasma Electrolytic Oxidation Coatings Fabricated on Aluminum in Silicate Electrolyte
Authors
Zhong Yang
Rui-qiang Wang
Chen Liu
Ye-kang Wu
Dong-dong Wang
Xin-tong Liu
Xu-zhen Zhang
Guo-rui Wu
De-jiu Shen
Publication date
15-05-2019
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 6/2019
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-019-04099-8

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