高濃度カセイソーダ溶液中でのインコネル600合金の腐食

概要

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Corrosion of Inconel 600(I-600) in concentrated NaOH(1〜20 M) solutions was studied under various temperatures (50〜140℃) and potentials. The solution treated(1050℃, 15 min) and sensitized (1) The polarization curves for the both specimens showed no change in electrochemical behavior in various corrosive environmental conditions at 50℃. However, the both specimens showed three peaks at higher temperatures than 50℃. The solution treated specimen showed slightly low current density in the primary passive region and slightly high current density in the secondary anodic peak, compared with those of the sensitized specimen. (2) The films formed on the specimen surface during corrosion tests in 20 M NaOH solution at 140℃ were made of NiO, Cr_2O_3 and Fe_3O_4. (3) The tests of crevice corrosion of I-600 and carbon steel (S15C) showed that general corrosion took place on the solution treated specimen, but the intergranular corrosion under the oxide films took place and it propagated to the crevice in the sensitized specimen.
社団法人日本材料学会の論文
1988-02-15