1.重庆市电力科学研究院 重庆;2.重庆大学材料科学与工程学院 重庆
TG178???????
国家自然科学基金项目（面上项目，重点项目，重大项目）
1.State Grid Chongqing Electric Power Research Institute;2.College of Materials Science and Engineering,Chongqing University
The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
本文通过溶液浸泡和土壤模拟腐蚀试验,初步发现表面形变强化处理对Q235钢的耐蚀性有显著改善。基于此,进一步对其在不同pH值、氯离子()和硫酸根离子()浓度的土壤模拟溶液中的电化学性能进行了研究,采用动电位极化和电化学阻抗谱(EIS)对其腐蚀行为进行分析。研究结果表明,经过表面形变强化处理后的Q235钢(ST-Q235)在不同浓度的氯离子环境中表现出优于Q235的耐蚀性,在高浓度条件下,对氯离子浓度表现出敏感性。对于不同浓度的环境,Q235钢的腐蚀电流密度随着浓度的增加而上升,而ST-Q235在高浓度下形成钝化层,表现出良好的耐蚀性。且在较高pH值(pH 6)下,ST-Q235的腐蚀电流密度显著降低,耐蚀性明显优于Q235。
In this study, preliminary findings from solution immersion and soil simulation corrosion tests reveal a significant improvement in the corrosion resistance of Q235 steel after surface deformation strengthening treatment. Based on these results, further investigations were conducted on its electrochemical performance in soil-simulating solutions with varying pH levels, chloride ions (), and sulfate ions () concentrations. The corrosion behavior was analyzed using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results indicate that surface deformation strengthened Q235 steel (ST-Q235) exhibits superior corrosion resistance compared to Q235 steel in chloride environments of different concentrations, showing sensitivity to high levels. In sulfate environments, the corrosion rate of Q235 increases with higherconcentrations, while ST-Q235 forms a passivation layer in highconcentrations, demonstrating good corrosion resistance. Additionally, at a higher pH value (pH 6), the corrosion rate of ST-Q235 significantly decreases, showing markedly better corrosion resistance compared to Q235.
