Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Research Paper
Influence of Sulfur Content on the Pitting Corrosion Behavior of the Surface and the Cross Section of Type 304 Stainless Steel Plate
Tomoaki SaidaSohei NakaiKatsuaki SatoKensuke KurodaMasazumi Okido
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2013 Volume 62 Issue 7 Pages 259-266


In order to clarify the influence of sulfur content on the pitting corrosion behavior of surface, L-section (longitudinal section)and T-section(transverse section)of stainless steel plate, cyclic corrosion test(CCT)and anodic polarization measurement in 0.85 M NaCl aqueous solution have conducted. Thick plate specimens (t 25 mm)of type 304 stainless steels containing 7, 29 and 57 ppm S were subjected to these tests. In CCT, rusting was more significant over T-section than surface and L-section. However, the number of initial rust spots over the T-section decreased with a reduction of S content. In pH 7 solution, the pitting potential(Epit)for 57 ppm S specimen was less noble at T-section than surface and L-section. But Epit at the T-section was shifted toward noble side with a reduction of S content. On the other hand, in pH 1 solution, Epit was low value regardless of S content. Furthermore, the cross-sectional shape of pits originated from MnS inclusion at the T-section was investigated. The MnS inclusion stretched into the steel matrix along the rolling direction and the growth of pitting corrosion along the MnS inclusion were observed.

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© 2013 Japan Society of Corrosion Engineering
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