すきま腐食機構と試験法への応用(<特集>ステンレス鋼)

概要

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The mechanism of crevice corrosion in stainless steels has been studied using an electrochemical technique. Experiments were conducted based on the idea that the rate of crevice corrosion could be determined by combining the crevice potential and the polarization curve in low pH, high Cl-solutions simulating the solution within crevice. The crevice potential determined by inserting a luggin capillary into a crevice made by coupling two stainless steel plates is in the range of -250 to -350 mV vs SCE. The rate of dissolution indicated by the polarization curve in 5M NaCl, pH 2, and the measured crevice potential is in good agreement with the corrosion rate obtained by the immersion test of the crevice specimen in neutral 3.5% NaCl solution. It is demonstrated by direct measurements of the crevice specimen and by supplementary experiments using a simulated crevice corrosion system that the electrochemical cell controlling crevice corrosion can be described quantitatively in terms of potentials inside and outside of the crevice, solution resistance in the crevice and the polarization behavior in the crevice solution. The application of the results to crevice corrosion testing is also discussed.
社団法人日本鉄鋼協会の論文
1977-04-01