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The effects of anodic and cathodic processes on the characteristics of ceramic coatings formed on titanium alloy through the MAO coating technology by Xuetong Sun; Zhaohua Jiang; Zhongping Yao; Xuelin Zhang is a Materials Science article available to read on EtoBox.

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This paper reports on the investigation into the effects of the different anodic j a and cathodic j c current densities on the variations of the anodic and cathodic processes and the associated changes in the characteristics of the coatings synthesized on Ti-6Al-4V alloy substrate by microarc oxidation technique. The coated samples were subjected to coating thickness and crosssection fracture observation. Phase and elemental composition at different depth of the coatings were evaluated through X-ray diffraction and energy dispersive spectrum analyses. The experimental results indicate that the increase of j a leads to the increasing slope of anodic voltage U + versus oxidation time plots, the larger coating thickness and the more coarse surface morphology of MAO coatings; while the aggrandizement of the cathodic process results in the lower growth rate and more uniform structure of coatings. The changes of the elements distribution from the interface towards the coating surface with variation of j a and j c are affected by the Ti anodic dissolution and the electromigration of electriferous particles, such as Al(OH) 4 À , in electrolytes.

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Author

Xuetong Sun; Zhaohua Jiang; Zhongping Yao; Xuelin Zhang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0169-4332)

Published

2005

Language

EN

Field

Materials Science (Physical Sciences)