The influence of plastic deformation on the structure of passive films on carbon steel in simulated pore solution

Journal of the Brazilian Chemical Society

Xingguo Feng²  Xiangyu Lu¹  Yu Zuo¹  Da Chen² 

[1] ,Hohai University College of Harbour, Coastal and Offshore Engineering Key Laboratory of Coastal Hazards and Protection of the Ministry of EducationJiangsu,China

关键词: concrete;    carbon steel;    passive films;    Mott-Schottky;    AFM;   

DOI  :  10.5935/0103-5053.20140003

来源: SciELO

【 摘 要 】

The process of passivation of carbon steel when experiencing plastic deformation in simulated pore solution has been studied using electrochemical tests and atomic force microscopy (AFM). The polarization results show that the activity of the carbon steel increased with increasing degree of deformation. Before the passive films were ruptured, the heavily deformed samples presented a high open circuit potential (OCP). On the other hand, the pitting incubation time decreased with increasing plastic deformation. The Mott-Schottky results suggested that the high deformation caused the passive films to be heavily doped. In addition, the space charge layers of passive films were thinned when the plastic deformation increased. The AFM observations indicated that the passive films become more inhomogeneous as the deformation increased. These results demonstrate that passive films on the deformed carbon steel become unstable when the plastic deformation increases.

【 授权许可】

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