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

被引：16

作者：

Liu, Fencheng ^{[1
]}

Wang, Xiaoguang ^{[1
]}

Zhou, Baosheng ^{[1
]}

Huang, Chunping ^{[1
]}

Lyu, Feiyue ^{[1
]}

机构：

[1] Nanchang Hangkong Univ, Sch Aeronaut Mfg & Engn, Nanchang 330063, Jiangxi, Peoples R China

来源：

MATERIALS | 2018年 / 11卷 / 10期

基金：

中国国家自然科学基金;

关键词：

2060 Al Li alloy; laser welding; element segregation; pitting corrosion; intergranular corrosion; LOCALIZED CORROSION; MECHANICAL-PROPERTIES; POROSITY FORMATION; MICROSTRUCTURE; BEHAVIOR; MG;

D O I：

10.3390/ma11101988

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (Al2Cu) phase and other phases precipitated in the weld. The (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.

引用

页数：12

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