| GAO Huan-fang,ZHAO Chun-xue,LUO Tian-yuan,LI Cong.Study on Phosphate Process for A231B Magnesium Alloy[J],37(4):37-38,56 |
| Study on Phosphate Process for A231B Magnesium Alloy |
| Received:May 19, 2008 Revised:August 10, 2008 |
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| DOI： |
| KeyWord:Phosphating Magnesium alloy Anticorrosion Polarization carre Epoxy coating |
| Author | Institution |
| GAO Huan-fang |
1. School of Chemistry and Biological Engineering, Chongqing Institute of Technology, Chongqing , China;2. Materials Science and Engineering College, Chongqing University, Chongqing , China |
| ZHAO Chun-xue |
School of Chemistry and Biological Engineering, Chongqing Institute of Technology, Chongqing , China |
| LUO Tian-yuan |
The Natural Environmental Test and Research Center of COSTIND, Chongqing , China |
| LI Cong |
School of Chemistry and Biological Engineering, Chongqing Institute of Technology, Chongqing , China |
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| Abstract: |
| The anticorrosive performance of bare AZ31B magnesium alloy at different phosphating times and different phosphating temperature was studied by Tafel, and the effect of the exsited phosphating film on anticorrosion of epoxy coatings on the AZ31B was studied. Results indicate that the phosphating times and phosphating temperature are obvious influence on the anticorrosive performance of AZ31B magnesium alloy, the best phosphating times is 5min and the best phosphating temperature is 50℃ . The corrosion current density of the phosphate fiim is least, the corrosion potential shift positively, and the polarization resistance is most at the best conditions. The corrosion current density of the epoxy coating on AZ31B magnesium alloy declines three orders of magnitude, and the corrosion potentials shifte positively 588mV because of the phosphate film. In other words, the phosphate film can improve the anticorrosive performance of the epoxy coatings on AZ31B magnesium alloy. |
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