采用模拟闭塞电池装置研究阴极保护对碳钢局部腐蚀扩展阶段闭塞区化学和电化学状态的影响。对Ａ３钢／ＮａＣｌ水溶液体系（ｐＨ＝１０．００，ｔ＝５０℃）闭塞区进行阴极极化，结果表明：Ｃｌ＾－由闭塞区内向外电迁移，即闭塞区内Ｃｌ＾－浓度下降，ｐＨ值由５．６迅速上升至１１以上，最终可达１２。碳钢表面发生明显钝化，闭塞区的自腐蚀电位Ｅｃｏｒｒ正移，自腐蚀电流密度下降，局部腐蚀受到抑制。
A simulated galavanstatic occluded cell was used to investigate the effects of cathodic protection on chanical and electmchanical states inside occluded cells of localized carrosion for A3 steel in 0.01 ml/L NaCl solution ( pH = 10. 00, t = 50°C ) . It was found that C1- concentration of the occluded solution decreased by electro-migration, solution pH inside occluded cells increased fmn 5.6 to above 12, the surface of A3 steel can fmn passive film, the E, of the occluded cell did rise, cornion rate decreased, so the localized canmion of A3 steel in the solution was retarded.
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