用电化学动电位再活化法与草酸浸蚀法研究了1Cr18Ni9Ti不锈钢的晶间腐蚀敏感性,并对动电位再活化法用于评价不锈钢晶间腐蚀敏感性的各种判据进行了综合分析.实验结果表明:各种判据与材料的敏化程度有良好的对应关系,且能灵敏定量地反映低敏化材料的晶间腐蚀敏感性的变化.各种判据中电流比ir/ia,电量比Qr/Qa的数据波动性小,重现性好;而再活化电流ir与再活化电量Qr的数据波动较大,重现性较差.电量判据(包括再活化电量Qr及电量比Qr/Qa)较电流判据(包括再活化峰峰值电流ir/ia)能更灵敏地反映材料晶间腐蚀敏感性的变化.
The susceptibility to intergranular corrosion(IGC)for 1Cr18Ni9Ti stainless steel has been studied by the electrochemical potentiodynamic reactivation(EPR)method and the oxalic acid etch test.Different criteria used in EPR test to evaluate the tendency of IGC have been analyzed in detail.All criteria are well correlated with the degree of sensitization.With increasing sensitization time,the value of criteria increases.Furthermore all criteria can sensitively and quantitatively reflect the diffeerence of material with lower sensitization In all criteria,the current ratio ir/ia and charge ratio Qr/Qa have better repeatability than the reactive current ir or the reactive charge Qr.The criteria of charge (Qr,Qr/Qa)are more sensitive than the criteria of current(ir, ir/ia).
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