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本文采用动电位极化、电化学阻抗谱、微观形貌观测等方法研究了不同表面粗糙度的4130X钢在质量分数为0.5%NaCl溶液中的腐蚀行为。实验结果表明,随表面粗糙度下降,试样表面积变化不大,其自然腐蚀电位下降,然腐蚀电流密度降低,电荷转移电阻降低,腐蚀反应剧烈程度整体有所下降。微观形貌显示,在反应发生初期,试样表面首先于凸起位置发生腐蚀,并且随腐蚀反应的进行逐渐扩展至试样整体表面。表面粗糙度对腐蚀反应影响主要来源于试样表面的几何形状差异、电化学活性差异和表面状态差异。
In this paper, the corrosion behavior of 4130X steel with different surface roughness in 0.5% NaCl solution was studied by potentiodynamic polarization, electrochemical impedance spectroscopy and micro-morphology observation. The experimental results show that as the surface roughness decreases, the surface area of the sample does not change much, and the natural corrosion potential decreases. However, the corrosion current density decreases, the charge transfer resistance decreases, and the severity of the corrosion reaction decreases. The microscopic morphology shows that the initial surface of the sample is corroded at the convex position and gradually extended to the whole surface of the sample as the corrosion reaction progresses. The influence of surface roughness on the corrosion reaction mainly comes from the difference of the geometric shape, the electrochemical activity and the surface state of the sample surface.