显微组织对高强耐候钢腐蚀性能的影响研究

Influence of Microstructure on Corrosion Resistance of High Strength Weathering Steel

通过控轧控冷获得了3种不同珠光体含量的高强耐候钢。采用周浸腐蚀实验研究了高强耐候钢和对比钢Q345B在0.01 mol/L NaHSO_(3)溶液中的腐蚀行为。结果表明:珠光体组织对实验钢耐蚀性存在不利影响,珠光体占比越低,锈层越致密,耐蚀性越好;Cu在锈层与腐蚀坑内富集,有效抑制了S向基体内侵蚀。富Cu相在内锈层形核长大,对内锈层起到锚固作用,抑制了其开裂进程。

Three high-strength weathering steels with different amount of pearlite were obtained through controlled rolling and controlled cooling technology.The corrosion behavior of high-strength weathering steels and a reference steel Q345B were studied comparatively by cyclic immersion corrosion experiments in 0.01 mol/L NaHSO_(3) solution.The results show that the presence of pearlite structure has an adverse effect on the corrosion resistance of the experimental steels.The lower the percentage of pearlite,the denser the rust layer and the better the corrosion resistance of the steels.Cu is enriched in the rust layer and corrosion pits,which can effectively inhibit the inward aggressiveness of S.Cu-rich phase nucleates and grows on the inner rust layer,which anchors the inner rust layer and inhibits its cracking process.