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| Effect of Chloride on Semiconducting Properties of Passive Films Formed on Supermartensitic Stainless Steel in NaHCO3 Solution |
| HAN Xiao-chen1,LI Jun1,ZHAO Kun-yu1,ZHANG Wei2,SU Jie3 |
1. College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2. CISRI Qingdao Marine Corrosion Institute, Qingdao 266071, Shandong, China
3. Institute of Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The effects of chloride ion on the electrochemical behavior and the semiconducting properties of the passive film on supermartensitic stainless steel in 0. 5 mol/L NaHCO3 solution were investigated using potentiodynamic polarization, the potentiostatic current transients and Mott-Schottky analysis. The results indicated that chloride ion narrowed passivation region and improved pitting susceptibility. The steady state current densities were independent of film-formed potentials, which was in good agreement with the assumption of the point defect model (PDM). The capacitance results showed the fact that the passive films had a multilayer character. The defect density decreased with increasing passive film formation potential. The chloride ion induced changes of the acceptor densities and donor densities of the passive films.
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Received: 23 July 2012
Published: 15 May 2013
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2013, Vol. 20 
