土壤环境中钢的杂散电流腐蚀研究

Stray Current Corrosion Behavior of Steel in Soil Environments

杂散电流可以造成金属的电解腐蚀侵害,在实验室模拟装置中,采用动电位扫描和恒电流极化法模拟杂散电流,研究了其对土壤环境中钢材的电解腐蚀行为,表征了其腐蚀产物及其表面钝化膜的形貌,探讨了腐蚀机理。结果表明,A3、16Mn和X70钢在土壤环境中的动电位扫描极化过程变化趋势基本相同;在恒电流阳极极化反应初期钢发生阳极溶解过程,待反应达到一定程度后,金属电极表面生成钝化膜,阳极极化电压发生突跃,钝化膜的生成与溶解交替过程造成阳极极化电压的振荡。

Stray current corrosion behavior of steel in soil environments was investigated by using potentiodynamic polarization and constant current polarization methods in laboratory, the corrosion products and surface passive films morphology were observed. The resuhs indicate that the potentiodynamie polarization processes of A3,16Mn and X70 steel in soil environments are sameness. In initial stage of constant current polarization, the steel corrosion occurs, and then, the anodic polarization potential jumps when the passive films are formed. In the end, the electrochemical oscillation behavior of potential is observed because of the alternation process of passive films grow and dis solve.