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通过准分子激光辐照提高6061铝合金与镀锌钢之间密封点焊异种接头的长期可靠性。

Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation.

作者信息

Joo Sung-Min, Kim Young-Gon, Kwak Young-Jin, Yoo Dong Jin, Jeong Chang-U, Park Jeshin, Oh Min-Suk

机构信息

Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 61452, Korea.

EV Component & Materials R&D Group, Korea Institute of Industrial Technology (KITECH), Gwangju 61012, Korea.

出版信息

Materials (Basel). 2021 Nov 9;14(22):6756. doi: 10.3390/ma14226756.

DOI:10.3390/ma14226756
PMID:34832158
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8621934/
Abstract

Structural-adhesive-assisted DeltaSpot welding was used to improve the weldability and mechanical properties of dissimilar joints between 6061 aluminum alloy and galvannealed HSLA steel. Evaluation of the spot-weld-bonded surfaces from lap shear tests after long-term exposure to chloride and a humid atmosphere (5% NaCl, 35 °C) indicated that the long-term mechanical reliability of the dissimilar weld in a corrosive environment depends strongly on the adhesive-Al6061 alloy bond strength. Corrosive electrolyte infiltrated the epoxy-based adhesive/Al alloy interface, disrupting the chemical interactions and decreasing the adhesion via anodic undercutting of the Al alloy. Due to localized electrochemical galvanic reactions, the surrounding nugget matrix suffered accelerated anodic dissolution, resulting in an Al6061-T6 alloy plate with degraded adhesive strength and mechanical properties. KrF excimer laser irradiation of the Al alloy before adhesive bonding removed the weakly bonded native oxidic overlayers and altered the substrate topography. This afforded a low electrolyte permeability and prevented adhesive delamination, thereby enhancing the long-term stability of the chemical interactions between the adhesive and Al alloy substrate. The results demonstrate the application of excimer laser irradiation as a simple and environmentally friendly processing technology for robust adhesion and reliable bonding between 6061 aluminum alloy and galvannealed steel.

摘要

采用结构胶粘剂辅助DeltaSpot焊接工艺来提高6061铝合金与热镀锌高强度低合金钢异种接头的焊接性和力学性能。对搭接剪切试验后的点焊粘结表面在长期暴露于氯化物和潮湿气氛（5%氯化钠，35℃）后的评估表明，在腐蚀环境中异种焊接的长期机械可靠性很大程度上取决于胶粘剂与Al6061合金的粘结强度。腐蚀性电解质渗入环氧基胶粘剂/铝合金界面，破坏化学相互作用，并通过铝合金的阳极咬边降低附着力。由于局部电化学电偶反应，周围的点焊熔核基体遭受加速的阳极溶解，导致Al6061-T6合金板的粘结强度和力学性能下降。在粘结胶粘剂之前，用KrF准分子激光辐照铝合金，去除了结合较弱的原生氧化覆盖层并改变了基体形貌。这使得电解质渗透率较低，并防止了胶粘剂分层，从而增强了胶粘剂与铝合金基体之间化学相互作用的长期稳定性。结果表明，准分子激光辐照作为一种简单且环保的加工技术，可用于6061铝合金与热镀锌钢之间的牢固粘结和可靠连接。

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