Microstructure characteristics and corrosion behavior of metal inert gas welded dissimilar joints of 6005A modified by Sc and 5083 alloys

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2025-01-01 Epub Date: 2025-01-23 DOI:10.1016/S1003-6326(24)66665-3

Guo-fu XU , Liang LIU , Ying DENG , Yu ZENG , Jun-chang CAO , Lei TANG , Xiao-yan PENG , Jia-qi DUAN , Mei-chan LIANG , Qing-lin PAN

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Abstract

The corrosion behavior and microstructure characteristics of metal inert gas (MIG) welded dissimilar joints of the 6005A alloy modified with Sc (designated as 6005A+Sc) and the 5083 alloy were investigated using corrosion tests and microscopy techniques. Results show that the dissimilar joints exhibit strong stress corrosion cracking (SCC) resistance, maintaining substantial strength during slow strain rate tensile tests. Notably, the heat-affected zone (HAZ) and base metal (BM) on the 6005A+Sc side show superior performance in terms of inter-granular corrosion (IGC) and exfoliation corrosion (EXCO) compared to the corresponding zones on the 5083 side. The lower corrosion resistance of the 5083-BM and the 5083-HAZ can be attributed to the presence of numerous Al₂Mg₃ phases and micro-scaled Al₆(Mn,Fe) intermetallics, mainly distributed along the rolling direction. Conversely, the enhanced corrosion resistance of the 6005A+Sc-BM and the 6005A+Sc-HAZ can be attributed to the discontinuously distributed grain boundary precipitates (β-Mg₂Si), the smaller grain size, and the reduced corrosive current density.

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Sc和5083合金改性6005A异种接头金属惰性气体焊接的组织特征及腐蚀行为

采用腐蚀试验和金相技术研究了Sc改性6005A合金（简称6005A+Sc）和5083合金金属惰性气体（MIG）焊接异种接头的腐蚀行为和显微组织特征。结果表明：异种接头具有较强的抗应力腐蚀开裂能力，在慢应变速率拉伸试验中仍能保持较高的强度；值得注意的是，6005A+Sc侧的热影响区（HAZ）和母材（BM）在晶间腐蚀（IGC）和剥落腐蚀（EXCO）方面表现优于5083侧的相应区域。5083-BM和5083-HAZ的耐蚀性较低，主要是由于存在大量的Al2Mg3相和微尺度Al6（Mn,Fe）金属间化合物，这些化合物主要沿轧制方向分布。相反，6005A+Sc-BM和6005A+Sc-HAZ的耐蚀性增强可归因于非连续分布的晶界沉淀（β-Mg2Si）、较小的晶粒尺寸和降低的腐蚀电流密度。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.