高钛耐候钢在模拟海洋气候下的腐蚀行为

Corrosion behavior of high-Ti weathering resistant steel in simulated marine climate

通过光学显微镜、扫描电镜和X射线衍射分析观察并研究自主设计的高钛耐候钢在模拟海洋气候下的耐腐蚀性能及腐蚀产物的形貌和组成。结果表明：高钛耐候钢的腐蚀质量损失率随周期浸润腐蚀次数增加而增大;高钛耐候钢的主要腐蚀产物和Q345钢类似,均为α-FeOOH、β-FeOOH、γ-FeOOH和Fe3O4,但是高钛耐候钢具有保护作用的α-FeOOH和γ-FeOOH峰较高;提高钛含量,可以提高低碳钢的耐蚀性能,其极化曲线的自腐蚀电位明显提高。

The corrosion resistance of self-designed high-Ti weathering resistant steel was investigated in simulated marine climate. The microstructure and composition of corrosion products were examined by optical microscope,scanning electron microscopy（SEM） and Xray diffraction（XRD）. The results show that the corrosion mass loss rate of the high-Ti weathering resistant steel increases with the increasing of cycle soaking time. The corrosion products of the high Ti steel and Q345 steel are both α-FeOOH,β-FeOOH,γ-FeOOH and Fe3 O4,but the contents of α-FeOOH and γ-FeOOH in the high-Ti weathering resistant steel is higher than that in Q345 steel. The results of Tafel polarization curves indicate that the corrosion resistance and corrosion potential increase obviously with the increase of Ti content.