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| XPS/SERS STUDY OF ELECTROCHEMICALLY MODIFIED PASSIVE FILM ON STAINLESS STEEL |
| Ronggang Hu;Changjian Lin |
| 厦门大学化学化工学院 固体表面物理化学国家重点实验室 |
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Abstract In order to make further insight into the mature of passivity,the combination of XPS and SERS was employed to ex-situ and in-situ characterize the chemical composition and structure of electrochemically modified passive film of 18/8 stainless steel.It was evidenced that the electrochemical modification gave rise to dehydration of the passive film.There existed an abundance of CrO3 in the outer layer of passive film ,but no CuO42- was sensed by XPS measurements.The enrichment of Cr apeared throughout the passive film, and the maximum of it did mot locate at the outmost layer.It implied that the preferential solvating hapned during the electrochemical modification.Like the coexistence of Cr2O3 and CrO3 in the barrier layer, the oxides of Fe(Ⅱ) and Fe(Ⅲ) species at the outer ayer played a beneficial role in the formation of non-crystalline passive film.It was revealed that from in-situ SERS and ion selective screen of CrO42- may be formed on the surface, which repulsed the attack of the aggressive ions and strengthened the stability of the electrochemically modified passive film of 18/8 stainless steel.
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Received: 05 July 1999
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Corresponding Authors:
Ronggang Hu
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