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首页> 外文期刊>Applied Surface Science >Microstructure and corrosion properties of diode laser melted friction stir weld of aluminum alloy 2024 T351*
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Microstructure and corrosion properties of diode laser melted friction stir weld of aluminum alloy 2024 T351*

机译：铝合金2024 T351 *的二极管激光熔融摩擦搅拌焊的组织和腐蚀性能

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摘要

Friction stir welding is a promising solid state joining process for high strength aluminum alloys. Though friction stir welding eliminates the problems of fusion welding as it is performed below melting temperature (T_m), it creates severe plastic deformation. Friction stir welds of some aluminum alloys exhibit relatively poor corrosion resistance. This research enhanced the corrosion properties of such welds through diode laser surface melting. A friction stir weld of aluminum alloy 2024 T351 was laser melted using a 1 kW diode laser. The melt-depth and microstructure were investigated using optical and scanning electron microscopy. The melt zone exhibited epitaxially grown columnar grains. At the interface between the melted and the un-melted zone, a thick planar boundary was observed. Energy dispersive spectroscopy analyzed the redistribution of elemental composition. The corrosion properties of the laser melted and native welds were studied in aqueous 0.5 M sodium chloride solution using open circuit potential and cyclic potentiody namic polarization. The results show noticeable increase in the pit nudeation resistance (390 mV) after the laser surface treatment The repassivation potential was nobler to the corrosion potential after the laser treatment, which confirmed that the resistance to pit growth was improved.
机译：搅拌摩擦焊接是用于高强度铝合金的有前途的固态连接工艺。尽管在低于熔化温度（T_m）的情况下进行摩擦搅拌焊接可以消除熔融焊接的问题，但会产生严重的塑性变形。一些铝合金的搅拌摩擦焊表现出较差的耐腐蚀性。这项研究通过二极管激光表面熔化增强了此类焊缝的腐蚀性能。使用1 kW二极管激光器对铝合金2024 T351的摩擦搅拌焊缝进行激光熔化。使用光学和扫描电子显微镜研究熔体深度和微观结构。熔融区显示出外延生长的柱状晶粒。在熔化区和未熔化区之间的界面处，观察到较厚的平面边界。能量色散光谱分析了元素组成的重新分布。在0.5 M氯化钠水溶液中，采用开路电势和循环电势极化作用，研究了激光熔化和自然焊缝的腐蚀性能。结果表明，在激光表面处理后，抗坑蚀性（390 mV）显着提高。再钝化电位对激光处理后的腐蚀势较弱，这证实了对蚀坑生长的抗性得到了改善。

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