轧制工艺对集装箱用SPA-H耐候钢耐蚀性能的影响

Effect of Rolling Process on Corrosion Resistance of SPA-H Container Weathering Steel

摘要: 采用CSP连铸连轧工艺与传统热轧工艺生产的SPA-H耐候钢, 在3.5%NaCl(质量分数)溶液模拟的海洋大气环境中进行周期浸润腐蚀试验, 分别采用扫描电子显微镜和电化学交流阻抗谱法(EIS)对比研究了两种工艺轧制钢试样锈层的形貌和耐腐蚀性能。结果表明: 采用连铸连轧工艺生产的SPA-H耐候钢的显微组织要比传统热轧工艺生产的耐候钢的更为细小均匀; 有Cl-存在的环境下, 连铸连轧工艺生产的SPA-H耐候钢的耐蚀性能优于传统工艺生产的。

Abstract: Two kinds of SPA-H weathering steel were produced by CSP continuous casting and rolling process and traditional hot rolling process. Their behaviors of corrosion resistance in a simulated marine atmosphere environment, 3.5 wt.% NaCl solution, were investigated by a cyclic dry/wet accelerated experiment and electrochemical impedance spectra (EIS). The morphology of rust scale of steel samples rolled by two processes was observed by SEM. The results show that the SPA-H steel prepared by CSP had the finer and evener microstructure than that prepared by traditional hot rolling process. Under the condition of chloride ions, the former possessed better corrosion resistance than the latter.