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采用模拟闭塞电池法和模拟闭塞区溶液法测定了０Ｃｒ１８Ｎｉ９奥氏不锈钢０．５ｍｏｌ·Ｌ－１ＮａＣｌ溶液体系在孔蚀的不同阶段孔内外间电流的换向电位ＥＴ．结果表明，在一定的范围内，ＥＴ值随闭塞区溶液组成的变化而变化．将ＥＴ与由孔蚀滞后环法于不同扫描速度和不同回扫电流所测得的孔蚀保护电位ＥＰ值作比较，发现ＥＰ值范围处于ＥＴ值范围之内，定义ＥＴ的下限值－４４０ｍＶ为孔蚀阴极保护电位
The reversing potentials ET of current in and outside the pores of the 0Cr18Ni9 austenitic stainless steel 0.5 mol·L-1NaCl solution system at different stages of pitting corrosion were measured by the simulated occlusion cell method and the simulated occlusion zone solution method. The results show that within a certain range, the ET value changes with the composition of the solution in the occlusion zone. ET is compared with the pitting corrosion potential EP measured by pitting etch-back ring method at different scan rates and different flyback currents. It is found that the range of EP values is within the ET range, and the lower limit of ET is defined as -440 mV Pitting cathodic protection potential