Formation of micro-arc oxidation coatings on AZ91HP magnesium alloys |
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| Authors: | R.F. Zhang S.F. Zhang |
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| Affiliation: | Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi 330013, China;School of Material Science and Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China |
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| Abstract: | In a neutral solution, coating formation by micro-arc oxidation (MAO) on AZ91HP magnesium alloy was studied. The process involved the substrate dissolution and coating development. During the first 5 s, the sample mass decreased, indicating substrate dissolution dominating the process. After 5 s, the sample mass began to increase and the coating development began to predominate the process. The coating was firstly nucleated on α phase and sparks initially appeared mainly on the edges of the sample. With treating proceeded, the coating was becoming uniform; meanwhile, microscopic pores of anodic coatings increased in size and decreased in number. |
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| Keywords: | A. Magnesium B. SEM C. Anodic films C. Oxide coatings |
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