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利用动电位极化曲线、电化学阻抗谱和电流-时间响应曲线对高氮钢在不同pH值NaCl溶液中的电化学行为进行了研究。结果表明,高氮钢在酸性NaCl溶液中处于非稳定状态,出现3个自腐蚀电位,在碱性NaCl中发生阳极钝化,腐蚀速率随溶液pH值的增加而降低;在阳极极化条件下,高氮钢在中性NaCl溶液中生成的膜疏松多孔,对基体的保护性较差;而酸性和碱性NaCl溶液中,生成的钝化膜比中性NaCl中的致密。H+和OH-参与了钝化膜的成膜过程。
The electrochemical behavior of high nitrogen steel in NaCl solutions with different pH values was studied by potentiodynamic polarization curves, electrochemical impedance spectroscopy and current-time response curves. The results showed that high nitrogen steel was unstable in acid NaCl solution and three self-corrosion potentials appeared, and anodic passivation occurred in alkaline NaCl. The corrosion rate decreased with the increase of solution pH. Under anodic polarization , And the films formed by high nitrogen steel in neutral NaCl solution were loose and porous, which had poor protective effect on the matrix. However, the passivation film formed in acid and alkaline NaCl solutions was denser than neutral NaCl. H + and OH- involved in the formation of the passivation film.