通过中性盐雾腐蚀试验、电化学测试等手段研究了Q420qD超低碳贝氏体高强桥梁钢和其对比材料F500L-Z普钢在中性介质中的腐蚀行为.结果表明：Q420qD超低碳贝氏体高强桥梁钢的耐腐蚀性优于F500L-Z普钢;其电化学阻抗值随金属材料浸泡时间的延长而增大，说明随着浸泡时间的延长，金属材料表面锈层不断加厚，逐渐增加了阻挡电解液对金属材料的侵蚀及金属材料表面金属原子失去电子向溶液中迁移的过程.
The corrosion resistance of Q420qD Ultra-low carbon bainitic high strength steel for bridge and F500L-Z steel was studied by means of neutral salt spray test and electrochemical measurement.The results shown that corrosion resistance of Q420qD steel was better than that of F500L-Z steel by comparative neutral salt spray tests for 1440 h.The fact was also proved that corrosion resistance of Q420qD steel was better than that of F500L-Z steel by electrochemical tests for different times in the neutral media in terms of their-free corrosion potentials,linear polarization curves and the electrochemical impedance spectroscopy(EIS).Furthermore,electrochemical impedance for Q420qD steel increased with the immersion time,which illuminated that the rust layer of which was also getting thicker with immersion time.So a thicker and compact rust layer on its surface may become a good barrier to the corrosive spices from the electrolyte so that to suppress the corrosion of steel substrate.
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