Title :
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
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;
Conference_Titel :
Mechanic Automation and Control Engineering (MACE), 2010 International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-7737-1
DOI :
10.1109/MACE.2010.5535689