| YANG Tian-yuan,SONG Ying-wei,DONG Kai-hui,CHEN Rong-shi,HAN En-hou.Preparation of Ceramic Conversion Coatings on AZ80 Magnesium Alloy and Its Corrosion Resistance[J],50(8):318-326 |
| Preparation of Ceramic Conversion Coatings on AZ80 Magnesium Alloy and Its Corrosion Resistance |
| Received:January 26, 2021 Revised:March 02, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.08.030 |
| KeyWord:magnesium alloy ceramic conversion coating oxidant corrosion resistance hexafluoro-zirconate/titanate |
| Author | Institution |
| YANG Tian-yuan |
Key Laboratory for Nuclear Materials and Safety Evaluation, Institute of Metals Research, Chinese Academy of Sciences, Shenyang , China;College of Materials Science and Engineering, University of Science and Technology of China, Hefei , China |
| SONG Ying-wei |
Key Laboratory for Nuclear Materials and Safety Evaluation, Institute of Metals Research, Chinese Academy of Sciences, Shenyang , China |
| DONG Kai-hui |
Key Laboratory for Nuclear Materials and Safety Evaluation, Institute of Metals Research, Chinese Academy of Sciences, Shenyang , China |
| CHEN Rong-shi |
Key Laboratory for Nuclear Materials and Safety Evaluation, Institute of Metals Research, Chinese Academy of Sciences, Shenyang , China |
| HAN En-hou |
Key Laboratory for Nuclear Materials and Safety Evaluation, Institute of Metals Research, Chinese Academy of Sciences, Shenyang , China |
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| Abstract: |
| This work aims to obtain a uniform and dense ceramic conversion coating by adding a suitable oxidant to the Zr-Ti basic coating-forming solution and improve the corrosion resistance of AZ80 magnesium alloy. The optimal bath solution was obtained based on the results of salt spray tests and SEM observation; the optimal pH and treatment time were selected according to the polarization curves of the ceramic conversion coating in 3.5%NaCl solution; XRD and XPS were used to analyze the chemical composition of the coating; the corrosion resistance was characterized by salt spray and electrochemical tests. When the mass concentration ratio of the oxidants of KMnO4 and NH4VO3 in the basic bath solution was 3∶1, the pH of the bath solution was 2.5, the treatment time was 3.5 min, and the coating was uniform and dense, which was mainly composed of ZrO2, TiO2, MgO, MgF2 and V2O3. The addition of the oxidants can suppress the adverse effect of the excessively fast hydrogen evolution reaction on the precipitation phases during the coating formation process, and realize the uniform deposition of the coating. The ceramic conversion coating increasess the salt spray resistance time of AZ80 magnesium alloy from 4 h to 48 h. The Zr-Ti ceramic conversion coating with suitable oxidants can significantly improve the corrosion resistance of AZ80 magnesium alloy. |
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