硝酸溶液中におけるステンレス鋼の端面腐食機構およびその防止策の検討

概要

論文の詳細を見る
Austenitic stainless steels with low carbon content have good corrosion resistance in nitric acid solutions. However, these steels are susceptible to corrosion in nitric acid solutions which contain highly oxidizing ions such as Cr_2O_7^<2->, Ru^<n+> etc. One of these is called "End Grain Corrosion" or "Tunnelling Corrosion". In this type of corrosion, a part of the cross-section of plate is preferentially attacked severely. In this study, it was clarified that the end grain corrosion was caused by intergranular corrosion (IGC) at phosphorus segregated areas which were induced during casting. And it was also found that the decrease of P content less than 0.015%, and heat treatments to reduce segregation of P were very effective to prevent the end grain corrosion.
社団法人日本鉄鋼協会の論文
1995-08-01