pH值和溶解氧对低碳钢点蚀诱发的影响  

Effects of pH Value and Dissolved Oxygen on Pit Initiation Behavior of Mild Steel

作　　者：曹国良[1] 李国民[1] 常万顺[1] 陈珊[1] 陈学群[1] 

机构地区：[1]海军工程大学理学院化学与材料系,武汉430033

出　　处：《装备环境工程》2009年第6期9-12,共4页Equipment Environmental Engineering

摘　　要：选择了2种低碳结构钢,在除氧及不除氧的3%NaCl溶液中进行了不同pH值条件下的极化试验,测定了钢的点蚀电位,并利用电子探针分析了腐蚀形貌。结果表明,随溶液的pH值的升高,钢更容易钝化,点蚀诱发敏感性降低。在相同的pH值条件下,溶液中的溶解氧可促进钢的钝化,导致点蚀电位变正。溶解氧降低了pH值对点蚀电位测定的敏感程度,使钢的临界钝化pH值降低。The pitting potential of mild steel was determined by means of polarization experiments in 3% NaCl solution under deaerated and non-deaerated condition with different the pH value. Pitting corrosion characteristics were analyzed with electron probe micro-analyzer （EPMA）. The results showed that passivation of the steel become easier and the pitting sensitivity decreases when the pH value of the solution increases; dissolved oxygen can cause pitting potential increase and help to produce protective film; dissolved oxygen can also reduce the sensitivity of pitting potential to pH value and cause the critical passivation pH value decrease.

关 键 词：碳钢 点蚀电位 PH 

分 类 号：TG172.5[金属学及工艺—金属表面处理]