Effect of current density on structure and property of coloured coating on aluminium via micro-arc oxidation. (April 2015)

• Record Type: Journal Article
• Authors: Liu, J. A.; Zheng, Z. B.; Li, J. Q.; Zhu, X. Y.; Liu, Y.; Bi, G. L.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 1
• Page Start: S1-79
• Page End: S1-82
• Publication Date: 2015-04
• Subjects: Micro-arc oxidation -- Coloured ceramic coating -- Aluminium -- Microstructure -- Corrosion resistance; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000001373
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : The coloured ceramic coating was prepared by using micro-arc oxidation technology on aluminium. CuSO4 was used as the colourant to produce the brown micro-arc oxidation coating. The effects of the applied current density on characteristics and properties of the micro-arc oxidation coating were studied. The results showed that there were significant changes on colour, surface morphology, thickness and corrosion resistance of the micro-arc oxidation coating when the current density increased: The colour deepened, and the pore size increased. In addition, the thickness of the micro-arc oxidation coating rose, and the roughness of the coating increased gradually. But the corrosion resistance of the micro-arc oxidation coating increased when the current density increased from 4 to 7 A dm −2, and then it dropped when the current density increased from 7 to 8 A dm −2 .