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Effect of Cl- on the Properties of the Passive Films Formed on 316L Stainless Steel in Acidic Solution

Guozhe Meng1,2), Yuan Li1), Yawei Shao1,2), Tao Zhang1,2), Yanqiu Wang1), Fuhui Wang1,2)   

  1. 1) Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, China
    2) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2012-10-19 Revised:2012-12-13 Online:2014-03-15 Published:2014-03-17
  • Contact: G. Meng
  • Supported by:

    National Natural Science Foundation of China (Nos. 50971050 and 50771038), the Ministry of Science and Technology of China (No. 2012FY113000) and the Fundamental Research Founds for the Central Universities (No. HEUCF101005).

Abstract:

The corrosion behavior of 316L stainless steel (316L SS) has been investigated in solutions containing various concentrations of chloride ions by using potentiodynamic polarization, capacitance measurement and Mott–Schottky relationship analysis (M–S). The result indicates that passive currents change slightly with the addition of chloride ions. The pitting potential (Epit) decreases linearly with log[Cl]. Correspondingly, the point defect diffusion coefficient (Do) of the passive film increases linearly with increasing log[Cl]. The results also indicate that the pitting corrosion of 316L SS follows the adsorption mechanism in NaCl solution.

Key words: 316L stainless steel, Passive film, Pitting corrosion