| LI Ling-jie,LEI Jing-lei,QU Wei-Juan,ZHAO Chuan,ZHANG Sheng-tao,PAN Fu-sheng.Inhibition of Molybdate Salt on Dissolution of Magnesium Alloys in Phosphoric Acid[J],36(1):16-18 |
| Inhibition of Molybdate Salt on Dissolution of Magnesium Alloys in Phosphoric Acid |
| Received:October 25, 2006 Revised:February 10, 2007 |
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| DOI： |
| KeyWord:Magnesium alloy Phosphoric acid Molybdate salt Inhibition |
| Author | Institution |
| LI Ling-jie |
1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing , China; 2. College of Materials Science and Engineering, Chongqing University, Chongqing , China |
| LEI Jing-lei |
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing , China |
| QU Wei-Juan |
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing , China |
| ZHAO Chuan |
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing , China |
| ZHANG Sheng-tao |
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing , China |
| PAN Fu-sheng |
College of Materials Science and Engineering, Chongqing University, Chongqing , China |
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| Abstract: |
| Corrosion inhibition of AZ61 magnesium alloys in phosphoric acid solution by molybdate salt is studied with gravimetric and corrosion potential measurements. Results show that the dissolution of magnesium alloys in 0.50mol•L-1 phosphoric acid is reduced by the addition of molybdate salt. The inhibition efficiency and the concentration of inhibitor follow linear function within the experimental concentration range. The molybdate salt mainly inhibits the cathodic reactions of magnesium alloy through forming a passive layer and covering the cathodic active sites. The apparent activation energy for AZ61 magnesium alloys in 0.50mol•L-1 phosphoric acid solution with and without 0.10mol•L-1 molybdate salt is respectively 2499 J×mol-1 and 1092 J×mol-1. Increasing the temperature is not helpful to improve the inhibition efficiency while it can fasten the occurrence of inhibition. |
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