交直流干扰下L355管线钢的电化学腐蚀行为研究
Study on Electrochemical Corrosion Behavior of L355 Pipeline Steel under AC and DC Current Interference
DOI: 10.12677/ms.2025.157161, PDF,   
作者: 陈 佳, 唐 乐, 王珮旋, 冯睿宇：成都工贸职业技术学院机械工程学院，四川 成都；汤伟杰：深圳职业技术大学工程训练中心，广东 深圳；靳军军, 孙 万：西南交通大学材料科学与工程学院，四川 成都
关键词: L355管线钢；交直流；电化学腐蚀；焊接接头；氢损伤；L355 Pipeline Steel； AC and DC Current； Electrochemical Corrosion； Welded Joint； Hydrogen Damage
摘要: 本研究通过电化学极化曲线和电化学阻抗谱(EIS)测试方法研究了L355管线钢母材及焊接接头在强酸性溶液(0.5 mol/L H2SO4 + 0.2 g/L CH4N2S)中的极化行为与阻抗特性，重点探讨了交流(AC)和直流(DC)电流干扰对其电化学性能的影响。结果表明，L355管线钢母材的耐蚀性能优于焊接接头，交流电流对极化机制的影响较小，而直流充氢导致极化曲线显著负移并形成钝化区(ΔE ≈ 150 mV)，自腐蚀电流密度显示母材(0.60 × 10−4 A/cm2)的耐蚀性优于焊接接头(5.46 × 10−5 A/cm2)。EIS分析显示，焊接接头的容抗弧半径在充氢后减小(由126.8 Ω·cm2到50.2 Ω·cm2)，直流充氢条件下的电荷转移电阻明显低于交流充氢。焊接接头耐蚀性优于母材，但对氢损伤更敏感。直流充氢通过阴极析氢促进氢损伤，而交流电流主要通过双电层扰动影响腐蚀过程。
Abstract: This research investigated the corrosion behavior and impedance characteristics of L355 pipeline steel base metal and welded joints in a strong acidic environment (0.5 mol/L H2SO4 + 0.2 g/L CH4N2S) through electrochemical polarization curves and electrochemical impedance spectroscopy (EIS) test methods, focusing on the effects of alternating current (AC) and direct current (DC) current interference on their electrochemical properties. The results showed that the L355 pipeline steel base metal exhibited superior corrosion resistance compared to the welded joint, AC current had minimal influence on polarization mechanisms, while DC hydrogen charging significantly shifted the polarization curve negatively and formed a passivation zone (ΔE ≈ 150 mV), and the self-corrosion current density showed that the corrosion resistance of the base metal (0.60 × 10−4 A/cm2) was better than that of the welded joint (5.46 × 10−5 A/cm2). EIS analysis revealed that the tolerable arc radius of the welded joint decreased after hydrogen charging (from 126.8 Ω·cm2 to 50.2 Ω·cm2), and the charge transfer resistance (Rt) under DC hydrogen charging conditions was significantly lower than that under AC hydrogen charging. The corrosion resistance of the welded joint was better than that of the base metal, but they are more sensitive to hydrogen damage. DC hydrogen charging promoted hydrogen damage through cathodic hydrogen evolution, whereas AC current affected the corrosion process mainly through double-layer disturbance.
文章引用：陈佳, 唐乐, 王珮旋, 冯睿宇, 汤伟杰, 靳军军, 孙万. 交直流干扰下L355管线钢的电化学腐蚀行为研究[J]. 材料科学, 2025, 15(7): 1512-1521. https://doi.org/10.12677/ms.2025.157161

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