研究了低碳钢在点蚀孔/缝隙腐蚀闭塞区模拟溶液中的腐蚀行为.结果表明低碳钢在pH等于2～4的模拟闭塞区溶液中,阴极过程由氢离子的扩散步骤控制,阴极去极化起着主要作用.当pH值小于2时,阴极过程表现为活化特征.阳极溶解过程遵循着Bockris机理.碳钢在闭塞区的腐蚀不存在临界pH值和临界Cl-浓度,腐蚀速度(Vc)的对数与pH值呈线性关系.闭塞区内溶液pH的微小变化,对腐蚀速度有明显的影响.外部溶液中的Cl-离子迁入闭塞区后,会促使溶液pH下降.
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