含水量对连铸铜包钢在大港土壤中腐蚀行为的影响简

采用极化曲线和电化学阻抗技术对连铸铜包钢在含水量20%~30%(质量分数)的大港滨海盐渍土中的腐蚀电化学行为进行研究。结果表明:埋样初期,连铸铜包钢腐蚀速率大致相等,含水量对其腐蚀行为影响较小,电极过程主要为活化控制;埋样后期,连铸铜包钢腐蚀速率先减小后趋于平稳,这是含水量对电极过程两个相反作用(氧浓度降低的阻滞作用和环境水化的促进作用)的综合作用结果,电极过程表现为阴极的氧扩散控制。

Influence of Water Contents on Corrosion Behavior of Continuous Casting Copper-clad Steel in Dagang Soil

The corrosion behavior of continuous casting copper-clad steel in Dagang soil with 20%~30% water contents was studied by polarization curve measurement and EIS. It is shown that during the initial corrosion stage, the corrosion rates of continuous casting copper-clad steel are almost equal, which imply the water contents have little influence on the corrosion behavior. The control step for corrosion of continuous casting copper-clad steel in the soil is activation polarization process at the initial stage. During the later stage, the corrosion rates of continuous casting copper-clad steel decrease and then tend to be stable with the increase of water contents, which may be due to the synergistic effect of the two opposite factors i.e. the block effect with reducing oxygen and the stimulation effect with environmental water on the electrode process. However the corrosion behavior is mainly affected by oxygen diffusion control.