用模拟闭塞电池恒电流实验研究了低碳钢(A3钢)在0.o1mo·L~(-1)NaCl溶液中闭塞区内化学状态的变化.对内试件通入阳极电流后,闭塞区内溶液pH值随时间的延长和电量的增加而迅速下降,当pH值约为6之后下降缓慢,pH值与电量的对数呈直线关系.CI~-向闭塞区内电迁移,每迁入Cl~-1 mol需要电量1.5～1.6F(法拉第),该关系不随时间长短和电流密度大小而变化. The change of chemical state in the occluded area of ​​low carbon steel (A3 steel) in 0.1 mol · L ~ (-1) NaCl solution was studied by simulating the constant current test of the closed cell.After the anodic current was applied to the inner sample, the occluded area The pH value of the solution decreased rapidly with the increase of the time and the amount of electricity, then dropped slowly when the pH value was about 6, and the pH value was in a linear relationship with the logarithm of the amount of electricity. Cl ~ -1 mol requires 1.5-16F power (Faraday), the relationship does not change with the length of time and the size of the current density.