Abstract: A double loop-electrochemical proteinomimetic reactivation (DL-EPR) method is used to evaluate the intergranular corrosion (IGC) susceptibility of hot rolled and annealed 430 ferrite stainless steel (0. 038% C, 16. 83% Cr). A suitable test parameter- in test solution 0. 05 mol/L H₂SO₄ +0. 001 mol/L KSCN + 0. 10 mol/L Na₂SO₄ with anodic potential scanning rate 5. 0 mV/s and reverse potential scanning rate 1.67 mV7s is determined, and the larger the value Ra (reverse scanning current Ir / anodic scanning current la) the - more serious the intergranular corrosion susceptibility of steel. Test results show that the hot rolled 430 ferritic stainless steel has obvious intergranular corrosion susceptibility and the Ra value of the sample air-cooled after rolling is larger than that of the sample water-cooled after rolling； with annealed treatment at 750 〜850℃ for 10 min the intergranular corrosion susceptibility of hot rolled 430 ferrite stainless steel is effectively reduced and eliminated.

摘要： 采用双环-电化学(DL-EPR)法评价了热轧和退火430铁素体不锈钢(/%:0.038C、16.83Cr)的晶间腐蚀敏感性。确定了一种适合的试验参数,试验溶液为0.05 mol/L H₂SO₄+0.001 mol/L KSCN+0.01 mol/LNa₂SO₄,扫描速率为正扫5.0 mV/s,反扫1.67 mV/s,当Ra值(反扫电流Ir/正扫电流Ia)越高,晶间腐蚀敏感性越严重。试验结果表明,热轧后的430铁素体不锈钢存在明显的晶间腐蚀敏感性,空冷试样的舶值比水冷的高;经过750～850℃10 min退火处理能够有效减轻和消除热轧430铁素体不锈钢晶间腐蚀敏感性。

关键词: 双环-电化学(DI-EPR)法, 晶间腐蚀, 铁素体不锈钢