The secondary passive film for type 304 stainless steel in 0.5 M H2SO4

被引:45
作者
Atrens, A [1 ]
Baroux, B [1 ]
Mantel, M [1 ]
机构
[1] UGINE RES CTR,F-73400 UGINE,FRANCE
关键词
D O I
10.1149/1.1838078
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
An examination has been carried out of the secondary passive film on Type 304 stainless steel in 0.5 M H2SO4. The characterization techniques used were electrochemical (potentiodynamic; potentiostatic, and film reduction experiments) and surface analytical. A bilayer model for the secondary passive film is proposed. It appears that next to the metal, there is a modified passive film which controls the electrochemical response; i.e., governs the current for any applied potential. On top of this modified passive film, the experimental data are consistent with a ''porous'' corrosion-product film which adds to the total film thickness but has little influence on the electrochemical response. The composition of the secondary passive film corresponds most probably to a mixed Fe/Cr oxide/hydroxide enriched in Cr3+, With a composition similar to a primary passive film.
引用
收藏
页码:3697 / 3704
页数:8
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