Structure and properties of ceramic coating on Al alloy by plasma microarc oxidation

Author

Huang, Shutao ; Zhou, Li

Author_Institution

Sch. of Mech. Eng., Shenyang Ligong Univ., Shenyang, China

fYear

2010

fDate

26-28 June 2010

Firstpage

3195

Lastpage

3198

Abstract

Microarc oxidation (MAO) coating on 7075 Al alloy were prepared in Na₂SiO₃ electrolytes with and without Na₂WO₄ addition. The effects of Na₂WO₄ with different concentrations on the surface morphology, cross-sectional microstructure and micro-hardness of ceramic coatings have been studied by using SEM and micro-hardness tester, respectively. The results show that the microarc oxidation surface treatment can form a dense ceramic coating on 7075 Al alloy, which has good adhesion with Al alloy substrate. The concentration of Na₂WO₄ solution has significant influence on the color, surface morphology, density and micro-hardness of ceramic coating, but has not much influence on the thickness of the ceramic coating. The addition of Na₂WO₄ into the base Na₂SiO₃ electrolyte resulted in the increase of the microhardness of the ceramic coating.

Keywords

adhesion; aluminium alloys; ceramics; copper alloys; electrolytes; magnesium alloys; microhardness; oxidation; plasma arc sprayed coatings; protective coatings; scanning electron microscopy; surface morphology; surface treatment; zinc alloys; 7075 aluminum alloy; AlZnMgCu; SEM; adhesion; ceramic coating; cross-sectional microstructure; electrolytes; microarc oxidation coating; microhardness; plasma microarc oxidation; surface morphology; surface treatment; Adhesives; Aluminum alloys; Ceramics; Coatings; Microstructure; Oxidation; Plasma properties; Surface morphology; Surface treatment; Testing; Al alloy; ceramic coating; microarc oxidation;

fLanguage

English

Publisher

ieee

Conference_Titel

Mechanic Automation and Control Engineering (MACE), 2010 International Conference on

Conference_Location

Wuhan

Print_ISBN

978-1-4244-7737-1

Type

conf

DOI

10.1109/MACE.2010.5535689

Filename

5535689