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采用腐蚀电位分析和电化学阻抗技术研究了经钝化的镀锌钢在不同浓度的NaCl溶液中的腐蚀行为.结果表明,镀锌钝化层在NaCl溶液中的腐蚀分为三个阶段:钝化膜的溶解、镀锌层的阴极保护和钢基体的腐蚀.浸泡初期主要受Cl-浓度影响,且浓度越高腐蚀越严重;浸泡中期,随着Cl-浓度增加镀锌层耐腐蚀性能先减小后增大,在5%NaCl溶液中耐腐蚀性最差.
The corrosion behavior of passivated galvanized steel in different concentrations of NaCl solution was studied by means of corrosion potential analysis and electrochemical impedance spectroscopy.The results show that the corrosion of galvanized passivation layer in NaCl solution is divided into three stages: The dissolution of the film, the cathodic protection of the galvanized layer and the corrosion of the steel substrate.The initial immersion was mainly affected by the Cl- concentration, and the higher the concentration was, the more severe the corrosion was. In the middle immersion stage, with the increase of Cl- concentration, the corrosion resistance of the galvanized layer Decrease and then increase, the worst corrosion resistance in 5% NaCl solution.