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Licensed Unlicensed Requires Authentication Published by De Gruyter February 23, 2021

The corrosion behavior of marine aluminum alloy MIG welded joints in a simulated tropical marine atmosphere

Lihua Gong, Weimin Guo and Feng Pan
From the journal Materials Testing

Abstract

The influence of metal inert-gas arc welding (MIG) on the corrosion behavior of 6061-T6 aluminum alloy in a simulated tropical marine atmospheric environment (related to high temperature, high humidity and high salt spray) were examined by dry-wet alternate immersion corrosion tests. The equivalent conversion was used to design the accelerated test time. The results show that in the initial stage, the intermetallic compound, rich in Fe, Si and Cu, had little influence on corrosion resistance in the heat-affected zone. For a corrosion time of 3 days in a tropical marine atmospheric environment, the corrosion rate of the welded joint increased rapidly, even reaching 3.5 times that of the base metal. Though the corrosion products had significant impact on slowing down the corrosion rate, as with the base metal, the corrosion rate of the welded joint was nearly double that of the base metal during the longest cycle period involving alternate immersion corrosion tests for 20 days.


State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI) Aoshanweiwenhai Road, Jimo District, Qingdao City, Shandong Province, China

Acknowledgment

This investigation was financially supported by the Research Fund of State Key Laboratory for Marine Corrosion and Protection of Luoyang Ship Material Research Institute (LSMRI) under contract No. KF190409.

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Published Online: 2021-02-23

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