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

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 resistance...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2019-06, Vol.28 (6), p.3652-3660
Main Authors: Yang, Zhong, Wang, Rui-qiang, Liu, Chen, Wu, Ye-kang, Wang, Dong-dong, Liu, Xin-tong, Zhang, Xu-zhen, Wu, Guo-rui, Shen, De-jiu
Format: Article
Language:English
Subjects:
ALUMINIUM
Characterization and Evaluation of Materials
Chemistry and Materials Science
COATINGS
Corrosion and Coatings
CORROSION PRODUCTS
CORROSION RESISTANCE
ELECTROCHEMICAL CORROSION
ELECTROCHEMISTRY
ELECTROLYTES
Engineering Design
HYDROGEN IONS 1 PLUS
MATERIALS SCIENCE
OXIDATION
OXIDES
PITTING CORROSION
PLASMA SWITCHES
Quality Control
Reliability
Safety and Risk
SCANNING ELECTRON MICROSCOPY
SILICATES
SODIUM CHLORIDES
Tribology
X-RAY SPECTROSCOPY
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Summary: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.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-019-04099-8