インヒビターによるCr-Mo鋳鋼の清水中腐食疲労防止効果に及ぼすすき間の影響

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Corrosion tests were carried out in fresh water containing sodium nitrite inhibitor at 80℃ using a Cr-Mo cast steel specimen and a specimen with a crevice which had been introduced artificially. The characteristics of corrosion inhibition of sodium nitrite inhibitor were then investigated. Fatigue tests were carried out in fresh water containing sodium nitrite inhibitor at 80℃ using a relatively large specimen with a crevice. The effect of crevice on corrosion fatigue prevention was then investigated. The results obtained were as follows. The critical concentration of sodium nitrite inhibitor required for corrosion inhibition of Cr-Mo case steel was found to be 1000 ppm. Even though sodium nitrite inhibitor was added above the critical concentration level, crevice corrosion occurred on the specimen with a crevice. The specimen had a clear fatigue limit in air or in fresh water containing sodium nitrite inhibitor over the critical concentration level. The fatigue strength of the specimen with a crevice became markedly low due to the crevice corrosion. Corrosion fatigue crack initiated from corrosion pits cased by crevice corrosion. Crevice corrosion also occurred in the crack propagation area near the crack initiation site, because hardly any fresh water was able to flow on to the crack surface due to obstruction by the O-ring bound to the specimen. On the initial crack propagation area where crevice corrosion occurred, striation was not clear and partial intergranular fracture was observed. Ductile patterns were predominant on the subsequent crack propagation area.
社団法人日本材料学会の論文
1985-04-15

インヒビターによるCr-Mo鋳鋼の清水中腐食疲労防止効果に及ぼすすき間の影響

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