Corrosion resistance of micro-arc oxidation coatings formed on aluminum alloy with addition of Al2O3

被引：8

作者：

Zhang, Y. ^{[1
,2
]}

Chen, Y. ^{[1
]}

Du, H. Q. ^{[1
]}

Zhao, Y. W. ^{[2
]}

机构：

[1] Zhejiang Ind Polytech Coll, Sch Mech Engn, Shaoxing 312000, Peoples R China

[2] Zhejiang Univ Technol, Key Lab E&M, Minist Educ & Zhejiang Prov, Hangzhou 310014, Zhejiang, Peoples R China

来源：

MATERIALS RESEARCH EXPRESS | 2018年 / 5卷 / 03期

基金：

中国国家自然科学基金;

关键词：

aluminum alloy; micro-arc oxidation; ceramic coatings; EIS; corrosion process; PLASMA ELECTROLYTIC OXIDATION; MAGNESIUM ALLOYS; CURRENT-DENSITY; BEHAVIOR; MICROSTRUCTURE; TITANIUM;

D O I：

10.1088/2053-1591/aab732

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Micro-arc oxidation (MAO)coatings were formed on the aluminum alloy in silicate-based electrolyte without and with the addition of Al2O3. It is showed that the coating produced in 7 g l(-1) Al2O3-containing electrolyte was of the most superior corrosion resistance. Besides, the corrosion properties of the coatings were studied by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) test in both 0.5 M and 1 M NaCl solution. The results proved that the coating is capable to protect the substrate from the corrosion of aggressive Cl- in 0.5 M NaCl after 384 h immersion. However, it can not offer protection to the aluminum alloy substrate after 384 h immersion in 1 M NaCl solution. The schematic diagrams illustrate the corrosion process and matched well with the corrosion test results.

引用

页数：13

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