铁在不同pH值的NaCl溶液中的腐蚀行为

    采用线性扫描伏安法(LSV)和Tafel方法测定铁的极化曲线，研究了铁电极在不同pH值NaCl溶液中，以及在不同浓度NaCl溶液中腐蚀规律.结果表明，酸的浓度越增加，铁的腐蚀越容易；Cl^-对铁有腐蚀促进作用.通过极化曲线得到腐蚀参数和动力学参数，探讨了不同溶液中铁的腐蚀机理：氯离子的存在能够改变钝化膜的组织结构，提高膜的溶解速率.

CORROSION BEHAVIOR OF IRON IN SODIUM CHLORIDE SOLUTIONS WITH DIFFERENT pH VALUE

    Linear sweep voltammetry and Tafel technology were employed to measure the polarization of iron electrode in sodium chloride solutions with different pH value and with different concentration of sodium chloride,so that to study the corrosion regulation of iron.The results indicate that hydrogen ion and chloride ion can accelerate the corrosion of iron as increasing their concentrations.The corrosion mechanisms of iron in deferent solutions are suggested.The addition of chloride ion into the sodium chloride solution can change the structure of the passive film and increase the dissolution rate of the film.