Experimental Design and Research on Hydrogen Diffusion in FSW Joints of Titanium/Aluminum Dissimilar Metals

Yuhua CHEN; Ziying GONG; Timing ZHANG; Jilin XIE; Shanlin WANG; Yinan XU

doi:10.7512/j.issn.1001-2303.2022.06.12

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Experimental Design and Research on Hydrogen Diffusion in FSW Joints of Titanium/Aluminum Dissimilar Metals
Vol. 52, Issue 6, Pages: 99-104(2022)
DOI： 10.7512/j.issn.1001-2303.2022.06.12

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陈玉华，龚资颖，张体明，等.钛/铝异种金属FSW接头的氢扩散试验设计与研究［J］.电焊机，2022，52（6）：99-104.

CHEN Yuhua, GONG Ziying, ZHANG Timing, et al.Experimental Design and Research on Hydrogen Diffusion in FSW Joints of Titanium/Aluminum Dissimilar Metals[J].Electric Welding Machine, 2022, 52(6): 99-104.
陈玉华，龚资颖，张体明，等.钛/铝异种金属FSW接头的氢扩散试验设计与研究［J］.电焊机，2022，52（6）：99-104. DOI： 10.7512/j.issn.1001-2303.2022.06.12.

CHEN Yuhua, GONG Ziying, ZHANG Timing, et al.Experimental Design and Research on Hydrogen Diffusion in FSW Joints of Titanium/Aluminum Dissimilar Metals[J].Electric Welding Machine, 2022, 52(6): 99-104. DOI： 10.7512/j.issn.1001-2303.2022.06.12.

摘要

钛/铝异种金属焊接结构因兼具两种材料各自的优势，在航空航天、汽车制造等领域有着广阔的应用前景。但异种金属在涉海等潮湿环境中极易发生由电偶腐蚀引发的氢扩散问题，造成钛合金的氢致脆化。本文提供了一种基于丝束电极理念的异种金属焊接接头重构方法，可以实现异种金属焊接接头各个亚区之间的偶接测试。在此基础上设计了异种金属焊接接头的氢扩散行为监测装置，通过试验验证获得了氢在金属材料中的扩散系数、吸附氢浓度等参数，为揭示异种金属焊接结构的环境氢脆问题奠定了基础。提出的异种金属焊接接头氢渗透测试方法可以推广应用于铝/钢、镁/钢等异种金属焊接接头氢扩散行为的检测，为评价电偶腐蚀中的氢致脆化影响提供了理论指导，弥补了现有方法仅能研究阳极溶解行为的不足。

Abstract

Titanium/aluminum dissimilar metals welding structures with respective advantage of the two materials has broad application prospects in aerospace, automobile manufacturing and other fields. However, these dissimilar metals are prone to hydrogen diffusion caused by galvanic corrosion in wet environments such as sea, resulting in hydrogen embrittlement of titanium alloys. A reconstruction method of welded joints of dissimilar metals based on the concept of wire beam electrode is electrode, which can realize the coupling test between various sub-regions of dissimilar metal welded joints. Subsequently, a hydrogen diffusion behavior monitoring device is designed. Through experimental verification, the parameters such as hydrogen diffusion coefficient and adsorbed hydrogen concentration of hydrogen in metals are obtained, which lays a foundation for revealing the environmental hydrogen embrittlement of dissimilar metals welded structures. The hydrogen permeation test method for dissimilar metal welded joints proposed in this paper can be extended to detect the hydrogen diffusion behavior of dissimilar metal welded joints such as aluminum / steel and magnesium / steel, which provides a theoretical guidance for evaluating the effect of hydrogen embrittlement in galvanic corrosion, and makes up for the deficiency that the existing methods can only study the anodic dissolution behavior.

关键词

电化学测试电偶腐蚀氢扩散Ti/Al异种材料连接搅拌摩擦焊

Keywords

electrochemical testgalvanic corrosionhydrogen diffusionTi/Al dissimilar material connectionfriction stir welding

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