| LI Yong.Study on the Optimum Range of Technical Parameters of Chronuum-free Conversion Treatment Solution for Magnesium Alloy[J],37(4):49-51,62 |
| Study on the Optimum Range of Technical Parameters of Chronuum-free Conversion Treatment Solution for Magnesium Alloy |
| Received:April 18, 2008 Revised:August 10, 2008 |
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| KeyWord:Magnesium alloy Conversion coating Treatment sotluion Acidity ratio Corrosion resistance |
| Author | Institution |
| LI Yong |
Zhejiang Industry & Trade Polytechnic, Wenzhou , China |
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| Abstract: |
| In order to know the optimum range of technical parameters of chromium-free conversion treatment solution which produce good quality coating, a new conversion treatment solution for magnesium alloy was analyzed, the relation between the acidity ratio as well as pH value and conversion coating quality was researched systematically. The results demonstrate that the values of total acidity and pH increase with the increase of the area of magnesium alloy specimen treated in solution. However, the value of free acidity is just the reverse. The surface morphology of conversion coating produced by treatment solution with different acidity ratio had been studied by means of SEM. The results indicate that the conversion coating treated by solution with too high and low acidity ratio is not completed and the uniform and complete conversion coating will be produced on condition that the acidity ration of treatment solution ranged from 8. 2 to 9.4. Morever. Its corrosion area ratio is low based on the results of 72h salt spray testing. |
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