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Zairyo-to-Kankyo Vol. 61 (2012), No. 5

ISIJ International
belloff
ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480
Publisher: Japan Society of Corrosion Engineering

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Zairyo-to-Kankyo Vol. 61 (2012), No. 5

Effects of Metal Ions on Pitting Potential and Pit Growth Behavior for 316L Stainless Steel

Yoshinori Isomoto, Shinya Matsuo

pp. 213-218

DOI:

10.3323/jcorr.61.213

Abstract

A potentiostatic method was used to measure pitting potential for SUS316L stainless steel and compared with a potentiodynamic polarization method standardized by JIS G 0577. Test conditions were sodium chloride solutions from 0.008 to 1 M containing metal ions less than 110 ppm at temperatures of 300 and 323 K. The pitting potentials of SUS316L steel decreased with the increases in concentration of chloride ions and in temperature. The test results of pitting potential were consistent between the potentiostatic and potentiodynamic polarization methods. The presence of metal ions in a 0.08 M sodium chloride solution greatly decreased the pitting potential of SUS316L steel. Pits were grown from a steel surface by using a galvanostatic method proposed in this study, and observed in a cross-sectional surface after the growth tests. As a results, it is found that the low current density or metal irons of Mn2+ and Cr3+ added in the sodium chloride solution changed the aspect ratio of cross-sectional pit morphology and promoted deeper pit growth. Mechanisms of pit initiation and growth were discussed in this study.

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Effects of Metal Ions on Pitting Potential and Pit Growth Behavior for 316L Stainless Steel

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Corrosion Behavior of Austenitic Stainless Steels on the Cut Edge Surface

Tomoaki Saida, Takuya Yamamoto, Katsuaki Sato, Shigeru Nakamura, Masazumi Okido

pp. 219-226

DOI:

10.3323/jcorr.61.219

Abstract

The cut edge surface of the stainless steel sheet is susceptible to corrosion compared with the surface of the sheet. At the cut edge surface, red rust easily tends to occur by the attack of chloride ion. However, there are still a lot of points not clear about the cause of the cut edge corrosion.
The salt spray test and the immersion test using NaCl solutions were conducted to evaluate corrosion resistance for the shear cut edge of SUS304 (18Cr-8Ni) and SUSXM7 (18Cr-9Ni-3Cu) cold rolled strips. It was found that transverse section (T section) corroded easier than longitudinal section (L section). In addition, the rust at the machined edge was less than shear cut edge.
The difference of the corrosion behavior in each section, L and T, was investigated by the electrochemical method. In anodic polarization curves at T section, the current density rose gradually at the less-noble potential than the L section. By the SEM observation and EPMA elemental mappings after anodic polarization measurement, it was considered that non-metallic inclusions (MnS etc.) extended along the metal flow of rolling direction influenced on the initiation and the growth of pitting corrosion.

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Corrosion Behavior of Austenitic Stainless Steels on the Cut Edge Surface

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