https://scholars.lib.ntu.edu.tw/handle/123456789/641936
標題: | Mn oxide conversion coating on AZ31B Mg alloy with hexafluorozirconate as an inhibitor in the permanganate conversion bath | 作者: | Hsiao, Ting Hsuan CHAO-SUNG LIN |
關鍵字: | Corrosion inhibitor | Electrochemical test | Galvanic coupling | Magnesium | Passive films | 公開日期: | 1-七月-2024 | 卷: | 660 | 來源出版物: | Applied Surface Science | 摘要: | Surface modification is essential for Mg alloys, including conversion coating, plasma electrolytic oxidation, organic coating, and plasma spraying. Permanganate conversion coating is a potential alternative to chromate coating for Mg alloys. A continuous MnO2 coating on commercial Mg alloys, which generally contain micrometric secondary phase particles, is still challenging. A thin, continuous MnO2 conversion coating layer on AZ31B Mg alloy was successfully prepared by adding hexafluorozirconate anions (ZrF62−) to an acidic permanganate conversion bath. AZ31B Mg alloy comprised α-Mg matrix and micrometric Al8Mn5 particles. In addition to MnO2 and MgO/Mg(OH)2, MgF2 was present in the coating formed in the presence of ZrF62−, but the amount of ZrO2 was scarce. The average thickness of the coating was reduced from 665 to 66 nm when 0.02 M ZrF62− was added. As a result, the contact resistance was reduced from 367 to 8.59 mΩ. Meanwhile, the corrosion resistance was improved. The uniformity of MnO2 coating was discussed, focusing on the Al8Mn5/Mg galvanic coupling effect. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/641936 | ISSN: | 01694332 | DOI: | 10.1016/j.apsusc.2024.159960 |
顯示於: | 材料科學與工程學系 |
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