電気化学的再活性化法による硫安液の粒界腐食作用の評価(<小特集>腐食防食小特集号)

概要

論文の詳細を見る
The electrochemical Potentiokinetic Reactivation method (EPR) which evaluates the intergranular corrosion susceptibility of stainless steel was applied to the intergranular corrosion test of Type 316 SS in saturated ammonium sulfate solutions with different pH at 80℃. The corrosion behavior was evaluated with the critical passivation current (I_a), the maximum reactivation current (I_r), and the reactivation ratio (I_a/I_r). The immersion test of the specimens, both solution-treated and sentitized, was conducted for 150 hrs, and the surface was observed by a scanning electron microscope (SEM). Type 316 SS was attacked by the test solution when the solution pH was lower than 2. The corrosion was stimulated by sensitization of heat treatment at 650℃, that is, the reactivation ratio was as high as 40%. It is concluded that the EPR method is feasible to evaluate the intergranular corrosion of austenitic stainless steel in corrosive chemicals.
社団法人日本材料学会の論文
1991-08-15