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本文采用扫描Kelvin探针、扫描振动电极等方法表征了NaCl液滴覆盖下Q235钢表面的微区电化学参数分布的特征.结果证实,NaCl液滴下碳钢表面的电位分布和电流密度分布是不均匀的,中心为阳极区,边缘为阴极区.液滴中心和边缘阴阳极电位相差0.4 V,阴阳极电流密度相差0.9μA/cm2.NaCl液滴下碳钢表面电化学参数的不均匀分布导致液滴边缘发生强烈的阴极极化,导致附近区域碱性化是微液滴形成的主要原因.
In this paper, the scanning electron microscopy (SEM), scanning vibrating electrode and other methods were used to characterize the distribution of electrochemical parameters on the surface of Q235 steel covered with NaCl droplets.The results show that the potential distribution and current density distribution on the surface of Q235 steel under NaCl droplet is not The center is the anode area and the edge is the cathode area.The potential difference between the anode and cathode of the droplet is 0.4 V and the current density of the anode and cathode differs by 0.9 μA / cm2.Uniform distribution of the electrochemical parameters of the surface of the carbon steel under the NaCl drop results in that the liquid A strong cathodic polarization occurs at the edge of the droplet, leading to alkalization in the vicinity of the area, which is the main reason for the formation of microdroplets.