碳含量对430铁素体不锈钢耐晶间腐蚀性能的影响

利用双环动电位再活化法(DL-EPR)、扫描电子显微镜(SEM)和能谱仪(EDS)研究了碳含量对430铁素体不锈钢耐晶间腐蚀性能的影响。结果表明:单纯的再活化率不能评价430铁素体不锈钢的晶间腐蚀敏感性,需要结合DL-EPR试验后材料表面形貌的电镜观察结果进行综合判断;对430铁素体不锈钢来说,碳含量越高,敏化时间越长,其晶间腐蚀倾向越大。

Effect of Carbon Content on Intergranular Corrosion of 430 Ferritic Stainless Steel

The effect of carbon content on the intergranular corrosion of 430 ferritic stainless steel was studied by double loop-electrochemical potentiokinetic reactivation (DL-EPR),SEM and EDS.The results indicate that the susceptibility to intergranular attack of 430 ferritic stainless steel cannot be measured by DL-EPR testing results simply.So it should be judged comprehensively in combination with observation of surface morphology of material after DL-EPR testing.The higher the carbon content or the longer the sensitization time,the greater the tendency to intergranular corrosion of 430 ferritic stainless steel.