采用扫描电镜对矫直前后热轧H型钢表面氧化皮的形貌进行了观察, 结果表明, 在矫直外力的作用下, 氧化皮易破损脱落。采用自腐蚀电位、极化曲线和电化学阻抗谱等方法, 研究了H型钢表面氧化皮矫直前后耐腐蚀性能的变化; 结果表明, 矫直过程破坏了氧化皮的致密结构, 使其对基体的保护作用下降, 导致耐蚀性能下降。

Surface oxide scale morphologies of hot-rolled H-beams before and after straightening were observed by scanning electron microscopy (SEM ). The results show that oxide scales are easily broken off under the action of straightening force. Also, the changes in corrosion resistance of the surface oxide scales on H-beams were studied by free corrosion potential, polarization curves and electrochemical impedance spectroscopy. The results indicate that the straightening process destroys the compact structure of oxide scales, resulting in the decrease of the protection effect on the matrix and the decrease of the corrosion resistance.