高氮钢激光电弧复合堆焊层的电化学腐蚀性能

doi:10.3969/j.issn.1004-132X.2021.12.015

摘要/Abstract

摘要： 采用电化学腐蚀方法研究了不同焊接参数对堆焊表层腐蚀行为的影响。研究结果表明，堆焊层耐蚀性随堆焊电流I、激光功率P、堆焊速度v的增大呈现先升高后降低的趋势；I=220 A，P=3.2 kW，v=0.8 m/min时，焊缝氮含量较高，试样表面钝化膜稳定性较好，抗点蚀能力最强。观察试样腐蚀形貌发现，I=260 A或v=0.6 m/min时，焊缝表面点蚀坑大而密集，并形成腐蚀沟，焊缝中的树枝晶有连续生长并向外扩展的趋势；P增至3.2 kW时，焊缝中的粗大柱状树枝晶变为均匀细小的条状枝晶，改善了耐蚀性。

关键词: 高氮钢, 电化学腐蚀, 堆焊, 点蚀, 树枝晶

Abstract: The effects of different welding parameters on surface corrosion behavior of surfacing weld were studied by electrochemical corrosion method. Research results show that corrosion resistance of surfacing layers increases firstly and then decreases with the increase of surfacing current I, laser power P, and surfacing speed v. Nitrogen content of welds is higher as I=220 A, P=3.2 kW, v=0.8 m/min, passive film on sample surfaces has better stability and the strongest pitting resistance. It is found from the corrosion morphology of the sample as I=260 A or v=0.6 m/min, pitting pits on the weld surfaces are large and dense, and corrosion ditch is formed, the dendrites in the welds tend to grow continuously and expand outward. When power increases to 3.2 kW, coarse columnar dendrites in the welds transforme into uniform and fine dendrites, which improves the corrosion resistance.

Key words: , high nitrogen steel, electrochemical corrosion, surfacing, pitting corrosion, dendritic crystal

中图分类号:

TG457.11

芮蔚, 白頔, 齐彤, 杜劭峰, 杨炙坤, 刘凤德, 张宏. 高氮钢激光电弧复合堆焊层的电化学腐蚀性能[J]. 中国机械工程, 2021, 32(12): 1503-1511.

RUI Wei, BAI Di, QI Tong, DU Shaofeng, YANG Zhikun, LIU Fengde, ZHANG Hong. Electrochemical Corrosion Performance of Laser-arc Hybrid Surfacing Layers for High Nitrogen Steel#br#[J]. China Mechanical Engineering, 2021, 32(12): 1503-1511.

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链接本文: http://www.cmemo.org.cn/CN/10.3969/j.issn.1004-132X.2021.12.015

http://www.cmemo.org.cn/CN/Y2021/V32/I12/1503

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