通过周期浸润和长时浸泡试验模拟了海洋环境, 利用腐蚀形貌观察和电化学分析等手段对耐候桥梁钢Q420qENH在模拟海洋环境中的腐蚀行为进行了研究, 并与传统耐候钢09CuPCrNi进行了对比。结果表明: Q420qENH钢在模拟海洋环境中的耐蚀性优于09CuPCrNi钢的; 周期浸润试验后, Q420qENH钢表面形成的锈层均匀致密、保护性较强; 在模拟海洋环境中, 随浸泡时间的延长, Q420qENH钢和09CuPCrNi钢的电化学阻抗先增大后减小, 最后增大至相对稳定的值。

The corrosion behavior of weathering steel Q420qENH for bridge in ocean environment simulated by cyclic immersion and longtime immersion experiments was studied through observation of corrosion morphology and electrochemical analysis. And traditional weathering steel 09CuPCrNi was studied comparatively. The results indicate that the corrosion resistance of Q420qENH steel was better than that of steel 09CuPCrNi in simulated ocean environment. The rust layer in the surface of Q420qENH steel after cyclic immersion experiment was uniform and compact, and had a strong protection. The electrochemical impedance of both Q420qENH steel and 09CuPCrNi steel increased first and then decreased, finally increased to a relatively stable value with the prolongation of immersion time in the simulated ocean environment.