Pitting Nucleation of 316L Stainless Steel in Different Environments
Jing WANG1,*(), Xin-chun SHANG1, Min-xu LU2, Lei ZHANG2
1 School of Mathematics and Physical, University of Science and Technology Beijing, Beijing 100083, China 2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Effect of temperature, concentration of chloride ion and dissolved oxygen concentration on pitting nucleation of polished 316L stainless steel was investigated using long-term immersing experiment and cyclic potentiodynamic polarization curves. Pitting initiated time and location in different artificial sea water environments were determined. The results show that pitting nucleation can be inhibited with increasing dissolved oxygen concentration, which is different from effect of temperature and chloride ion. For 316L stainless steel, after immersed in 10% (mass fraction) NaCl solution with 8×10-6 dissolved oxygen concentration at 4℃, local destroy occurs on the surface passive film, pitting nucleation time is 60-70 days, and MgO-Al2O3 series and CaO-SiO2 oxide series non-metal inclusions exist at the pitting nucleation sites. After immersed in artificial sea water at 4℃, and with 0.02×10-6 dissolved oxygen concentration, the time for pitting corrosion appears on the surface of 316 stainless steel is 70-80 days.
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