スペクトル解析による応力腐食割れに関する研究(<小特集>腐食防食小特集)

概要

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Stress corrosion cracking (SCC) was investigated by spectral analysis of corrosion potential signals. Caustic cracking of carbon steel (S10C) and SCC of stainless steel (SUS304) in various chloride solutions were studied. The marked change of the power spectral density (PSD) in the frequency domain was observed in the vicinity of 5 mHz for caustic cracking of carbon steel and in the frequency range from 10 to 100 mHz for SCC of stainless steel. It was also observed that the corrosion potential signal in 20%NaCl + 1%Na_2Cr_2O_7 solution was bigger than in 42%MgCl_2 solution or 60%CaCl_2 solution for SCC of Stainless steel. By comparing PSD with the changes of elongation and corrosion potential, the following conclusion was obtained: the increase of PSD might be related to the break-down of passive film and the generation of cracks for caustic cracking of carbon steel, while its increase might be attributed to the localized change in the passive film for SCC of stainless steel.
社団法人日本材料学会の論文
1988-01-15