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首页> 外文期刊>International Journal of Electrochemical Science >A Study on Effect of Intergranular Corrosion by Heat Input on Inconel 625 Overlay Weld Metal
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A Study on Effect of Intergranular Corrosion by Heat Input on Inconel 625 Overlay Weld Metal

机译：热输入对晶界腐蚀对Inconel 625堆焊金属的影响研究

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This study discusses the effect of welding heat input on intergranular corrosion of the weld metal ofInconel 625 alloy. A specimen of Inconel 625 overlay with a weld metal that controlled welding heatinput was manufactured, and aging heat treatment was conducted to investigate sensitization bychromium carbides. The electrochemical single-loop (SL) and double-loop (DL) electrochemicalpotentiokinetic reactivation (EPR) experiments, together with the chemical ferric sulfate-sulfuric acidand nitric acid tests, were conducted to determine intergranular corrosion susceptibility between thespecimens. In the SL and DL EPR experiments, specimens were stabilized in the weld metal, andtherefore intergranular corrosion susceptibility could not be determined. However, in the ferric sulfate- sulfuric acid and nitric acid tests, the corrosion speed increased as heat input increased. This wasbecause the amount of diluted Fe increased as the welding heat input increased, leading tomicrosegregation between the dendrites, which had a negative effect on the corrosion resistance.
机译：本研究讨论了焊接热量输入对Inconel 625合金焊接金属的晶间腐蚀的影响。制造了具有可控制焊接热输入的焊接金属的Inconel 625覆盖层样品，并进行了时效热处理以研究碳化铬引起的敏化。进行了电化学单环（SL）和双环（DL）电化学势动能再活化（EPR）实验，以及化学硫酸铁-硫酸和硝酸试验，以确定样品之间的晶间腐蚀敏感性。在SL和DL EPR实验中，试样被稳定在焊缝金属中，因此无法确定晶间腐蚀敏感性。但是，在硫酸铁，硫酸和硝酸测试中，腐蚀速度随着热量输入的增加而增加。这是因为随着焊接热输入的增加，稀释的Fe的量增加，导致枝晶之间发生微偏析，这对耐腐蚀性产生了负面影响。

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