通过测量循环极化曲线和电化学阻抗谱, 研究不同焊接工艺制备的超级双相不锈钢焊接接头电化学特征, 探讨其耐蚀性. 结果显示,较低的线能量输入可导致较快速的冷却, 使奥氏体相和铁素体相中元素含量相近而表现出较好的耐点蚀性, 接头的整体表现良好; 加填含有较高含量的奥氏体稳定元素的焊丝以及利用背面氮气保护的焊接工艺均可以减小对焊接接头耐点蚀性的不利影响; 而在近似于海水介质的浸泡中,本研究所采用的焊接工艺虽然使钝化膜在浸泡过程中有不同的变化, 但均处于较稳定的状态.
Electrochemical characteristics of welded joints of a super-duplex stainless steel prepared by different welding procedures were studied by cyclic anodic polarization curves and EIS, meanwhile the changes of corrosion resistance were put forward. The results showed that lower line energy input could result in rather rapid colling rate and in rather equal content of alloying elements in austenite and ferrite phases, which then showed more or less the same pitting corrosion resistance, so that made the whole welded joint a better pitting corrosion resistance. Furthermore, the application of filler wire and of nitrogen as shielding gas could reduce the pitting corrosion sensitivity of the joints. The welding procedures used in this article all made the passive film of welded joints show better stability though different changes during the course of immersion in seawater.
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