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.
出处
《腐蚀与防护》
CAS
北大核心
2013年第9期811-814,共4页
Corrosion & Protection
关键词
碳钢
3％NaCl溶液
锈层
腐蚀行为
carbon steel
3% NaCl
solution
rust layerl corrosion behavior
