Investigation on the nickel content design and the corrosion resistance of low alloy steel welded joint in tropical marine atmosphere environment,Materials and Corrosion

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Investigation on the nickel content design and the corrosion resistance of low alloy steel welded joint in tropical marine atmosphere environment
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-05-15 , DOI: 10.1002/maco.202112433
Tianyi Zhang ₁ , Wei Liu ₁ , Baojun Dong ₁ , Yongjun Wu ₁ , Yueming Fan ₁ , Yonggang Zhao ₁ , Longjun Chen ₁

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In this study, three kinds of welding materials (WMs) with different Ni contents were designed for low alloy steel welded joints made by CO₂ gas-shielded welding technique. The corrosion resistance of welded joint was studied through the atmosphere exposure test in Trat, Thailand. Results show that there was a hardening in the heat-affected zone after welding, and the average hardness slightly increased with the increase of Ni in WM. The electrochemical activity at the fusion line zone enhanced with the addition of Ni in WM, indicating a more obvious local galvanic corrosion effect there. Ni promoted the generation of NiFe₂O₄ and the transformation from γ-FeOOH to α-FeOOH, which increased the impedance modulus of the rust film on WM. More important, the corrosion performance assessment illustrated that the addition of Ni in WM hardly had an effect on the corrosion step values after half a year test, which confirmed that there is no need to add excessive content of Ni.

中文翻译：

热带海洋大气环境下低合金钢焊接接头镍含量设计及耐蚀性研究

在本研究中，针对采用 CO ₂气体保护焊接技术制造的低合金钢焊接接头，设计了三种不同 Ni 含量的焊接材料 (WMs) 。焊接接头的耐腐蚀性通过在泰国达叻府进行的大气暴露试验进行研究。结果表明，焊后热影响区出现硬化，平均硬度随着WM中Ni含量的增加而略有增加。随着WM中Ni的加入，熔合线区的电化学活性增强，表明那里有更明显的局部电偶腐蚀效应。Ni促进NiFe ₂ O ₄的生成以及从 γ-FeOOH 到 α-FeOOH 的转变，这增加了 WM 上锈膜的阻抗模量。更重要的是，腐蚀性能评估表明，经过半年的试验，在WM中添加Ni对腐蚀步长值几乎没有影响，这证实没有必要添加过量的Ni。

更新日期：2021-05-15

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