Abstract
To determine whether large sudden pH and Cl
−
concentration changes occur during the crevice corrosion of Fe-16Cr, as in the case of Fe-18Cr-10Ni-5.4Mn, simultaneous measurement of the pH and Cl
−
concentration was performed in 0.01 M NaCl (pH 3.0). The corrosivity of the crevice solution was different before and after crevice corrosion initiation, and the sudden changes in the pH and Cl
−
concentration inside the crevice were the same as those for Fe-18Cr-10Ni-5.4Mn. The incubation period was characterized by weak acidification (pH 1.6−2.0) and a small accumulation of Cl
−
(0.1−0.3 M). The growth period was characterized by strong acidification (pH ≤ 1.0) and a large accumulation of Cl
−
(≥1.0 M). At the crevice corrosion initiation site, a metastable pit was observed and a S signal was detected from the residual in the pit. It can be concluded that the crevice corrosion of Type 430 stainless steels is initiated by Cl
−
, which generates metastable pitting at sulfide inclusions. The effect of the electrode potential on the pH and Cl
−
concentration was investigated in 0.01 M NaCl from −0.05 to 0.1 V. No effect of potential was observed during both the crevice corrosion incubation and growth periods.
Funder
Japan Society for the Promotion of Science
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
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