| TANG Ya-lu,WANG Wen-bing.Study on the Citric Acid Passivation for Stainless Steel[J],37(5):68-70 |
| Study on the Citric Acid Passivation for Stainless Steel |
| Received:June 24, 2008 Revised:October 10, 2008 |
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| DOI： |
| KeyWord:Stainless steel, Citric Acid Passivation Pitting corrosion EIS XPS |
| Author | Institution |
| TANG Ya-lu |
Huaiyin Institute of Technology, Huaian , China |
| WANG Wen-bing |
Guangda Shanghai Manufacturing City, Shanghai , China |
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| Abstract: |
| The citric acid passivation process for stainless steel was studied. The anti-corrosion performance of passive film was studied by chemical immersion method and electrochemical method, the surface state of passive film was studied by XPS technology. The results show that passive film is formed with metallic oxides, metallic hydroxides, a spot of metals and crystal water. After passivation, the sample s pitting potential reaches llOOmV, the corrosion rate in FeCl3 solution is smaller obviously than untreated sample. The optimum parameters of passivation in citric acid solution are 4% citric acid, 65℃ , 15min, and the time of post-treatment in 500/o HN03 is llruinutes. |
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