TA1高频感应焊接头和基体在NaCl溶液中的电化学腐蚀行为

Electrochemical corrosion behavior of TA1 weldedjoints and substrate by frequency induction welding in NaCl solution

高频感应焊TA1薄壁管的焊接接头和基体在微观结构方面存在差异,电化学腐蚀行为往往是不同的。采用动电位极化技术和电化学阻抗谱(EIS),分析了TA1基体和焊接接头在不同浓度NaCl溶液中的电化学腐蚀行为。实验结果表明,随着氯离子浓度的增加,TA1基体和焊接接头的腐蚀电位呈负偏移,极化电阻逐渐减小,腐蚀速率增大。相比基体,焊接接头的腐蚀电位更高、极化电阻更大、腐蚀速率更低,表明耐腐蚀性能更好。实验可为高频感应焊TA1薄壁管在海水环境中的实际应用提供一定的理论依据。

High-frequency induction welding of TA1 thin-walled pipes there are differences in terms of the microstructure of the welded joint and the substrate,the electrochemical corrosion behavior is often different.The electrochemical corrosion behavior of TA1 substrate and welded joints in different concentrations of NaCl solutions was analyzed by using the dynamic potential polarization technique and electrochemical impedance spectroscopy(EIS).The experimental results showed that with the increase of chloride ion concentration,the corrosion potential of TA1 substrate and welded joints were negatively shifted,the polarization resistance gradually decreased,and the corrosion rate increased.Compared with the substrate,the welded joint has hiqher corrosion potential,larger polarization resistance and lower corrosion rate,indicating better corrosion resistance.The experiment can provide a certain theoretical basis for the practical application of high-frequency induction welding TA1 thin-walled pipe in seawater environment.