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Corrosion Resistance of 2060 Aluminum–Lithium Alloy LBW Welds Filled with Al-5.6Cu Wire

School of Aeronautical Manufacturing and Engineering, Nanchang Hangkong University, Nanchang 330063, China
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Materials 2018, 11(10), 1988; https://doi.org/10.3390/ma11101988
Received: 14 July 2018 / Revised: 15 September 2018 / Accepted: 11 October 2018 / Published: 15 October 2018
(This article belongs to the Special Issue Corrosion and Corrosion Protection for Light Metals/Alloys)
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Abstract

Alloy sheets of type 2060 aluminum–lithium were welded by laser beam welding (LBW) filled with ER2319 Al-5.6Cu wire. Microstructural observations showed the uneven distribution of columnar grains, equiaxed grains and equiaxed dendrite grains in the weld. The θ′(Al2Cu) phase and other phases precipitated in the weld. The θ′(Al2Cu) phase centrally distributed at the grain boundaries. During the immersion corrosion, the pitting corrosion first occurred and then gradually expanded and transformed to intergranular corrosion and exfoliation corrosion. The electrochemical corrosion test showed a higher corrosion tendency of the base metal and heat-affected zone for the lower corrosion potential, but the corrosion current density of the weld was relatively larger. The segregation of Cu, Mg and other elements at the grain boundary aggravated the occurrence of intergranular corrosion. View Full-Text
Keywords: 2060 Al Li alloy; laser welding; element segregation; pitting corrosion; intergranular corrosion 2060 Al Li alloy; laser welding; element segregation; pitting corrosion; intergranular corrosion
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Liu, F.; Wang, X.; Zhou, B.; Huang, C.; Lyu, F. Corrosion Resistance of 2060 Aluminum–Lithium Alloy LBW Welds Filled with Al-5.6Cu Wire. Materials 2018, 11, 1988.

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