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在除氧的HCO-3溶液中,采用原位测量开路电位方法研究了HCO-3浓度对低碳钢腐蚀活化/钝化状态的影响,用SEM观察了低碳钢电极在除氧的HCO-3溶液中长期腐蚀后的表面形貌,用电化学阻抗谱(EIS)方法研究了电极的腐蚀演化特征及规律,用XRD方法检测了腐蚀产物的相组成.结果表明,低碳钢的开路电位随浸泡时间的延长以及HCO-3浓度的升高而升高;长期浸泡后,在0.01 mol/L HCO-3溶液中低碳钢的阳极溶解处于极限扩散状态,而在高于0.02 mol/L HCO-3溶液中处于钝化状态;锈层的主要腐蚀产物为a-FOOH和Fe3O4.
The effect of HCO-3 concentration on the corrosion activation / passivation of low carbon steel was investigated by in-situ measurement of open circuit potential in deaerated HCO-3 solution. The effects of HCO- 3 solution after long-term corrosion, the electrochemical corrosion resistance (EIS) method was used to study the evolution characteristics and regularity of electrode corrosion, and the phase composition of corrosion products was detected by XRD.The results showed that the open circuit potential With the prolongation of soak time and the increase of HCO-3 concentration, the anodic dissolution of low-carbon steel in 0.01 mol / L HCO-3 solution was in a state of limit diffusion after long-term immersion, HCO-3 solution in passivation state; corrosion of the main corrosion products of a-FOOH and Fe3O4.