带锈层碳钢在3% NaCl溶液中的腐蚀电化学行为  

Electrochemical Corrosion Behavior of Carbon Steel Covered by Rust Layer in 3% NaCl Solution

作　　者：吴善宏 肖丽 尹力[2] 胡家元[2] 

机构地区：[1]浙江浙能乐清发电有限公司,温州325609 [2]武汉大学动力与机械学院,武汉430072

出　　处：《腐蚀与防护》2013年第9期811-814,共4页Corrosion & Protection

摘　　要：采用失重法、红外光谱、电化学阻抗谱等方法研究了碳钢在3%NaCl溶液中的腐蚀行为。结果表明,锈层会显著影响碳钢的腐蚀过程。锈层由γ-FeOOH及Fe_3O_4构成;其中γ-FeOOH易被还原而起氧化剂作用,Fe_3O_4层起大阴极作用,氧可直接在锈层表面还原。锈层不仅不能阻碍碳钢腐蚀过程,而且将加速其腐蚀,最终碳钢腐蚀速率由溶液中的氧极限扩散速率所决定。The corrosion behavior of carbon steel in 3% NaCl solution was studied by weight-loss method, infrared spectroscopy （IR） and electrochemical impedance spectroscopy（EIS）. The results indicate that the corrosion process of carbon steel is affected by rust layer significantly. The rust layer is composed of γ-FeOOH and Fe3 O4. γ-FeOOH can be reduced easily and work as oxidant. The Fe3 O4 layer provides a large cathodic area and oxygen can be reduced on the surface of rust layer. As a result, the rust layer can not prevent the corrosion of carbon steel and even can accelerate the corrosion process. The corrosion rate of carbon steel is determined by the limiting diffusion rate of oxygen.

关 键 词：碳钢 3％NaCl溶液 锈层 腐蚀行为 

分 类 号：TG174[金属学及工艺—金属表面处理] O646[金属学及工艺—金属学]