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

Journal Article · Sat Jun 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04099-8· OSTI ID:22970744

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 ^[1]

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1. Yanshan University, State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering (China)

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{sup +} 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.

• OSTI ID: 22970744
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 6 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
COATINGS
CORROSION PRODUCTS
CORROSION RESISTANCE
ELECTROCHEMICAL CORROSION
ELECTROCHEMISTRY
ELECTROLYTES
HYDROGEN IONS 1 PLUS
OXIDATION
OXIDES
PITTING CORROSION
PLASMA SWITCHES
SCANNING ELECTRON MICROSCOPY
SILICATES
SODIUM CHLORIDES
X-RAY SPECTROSCOPY