采用周期浸泡腐蚀试验技术,结合电子探针以及XRD物相分析等手段,研究了桥梁钢Q500qENH及其焊缝和普通Q345B钢在模拟工业大气环境中(0.01 mol/L NaHSO3水溶液)的耐腐蚀性能.结果表明,桥梁钢内外锈层分明,锈层较致密,且在内锈层中检测到Cr有明显富集,其年腐蚀速率也相对较低.Q345B钢的锈层疏松,内外锈层没有明显分界.桥梁钢锈层都是由α-FeOOH、γ-FeOOH和Fe3O4组成的.桥梁钢中物相o-FeOOH含量较多,Cr分布于内锈层的裂纹处,使内锈层更加致密.
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