期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 52, 期 1, 页码 85-102出版社
SPRINGER
DOI: 10.1007/s10800-021-01610-9
关键词
Aluminum alloy; steel dissimilar joint; Refilled friction stir spot welding; Galvanic corrosion; Polarization curve
资金
- National Natural Science Foundation of China [51674060]
- Collaborative Innovation Center of Major Machine Manufacturing in Liaoning, China
Refilled friction stir spot welding of aluminum alloy to galvanized and uncoated steel was studied for microstructure and corrosion behavior of joints. It was found that Mg and Zn segregated at the grain boundaries of the mixed layer, leading to serious intergranular corrosion. Additionally, the corrosion current density decreased with increasing immersion time due to the passivation films and corrosion products formed on the joint surface.
Refilled friction stir spot welding of aluminum alloy to galvanized and uncoated steel was conducted, and the microstructure and the corrosion behavior of joints were investigated. Al5FeSi phases distributed in TMAZ and broke during tool stirring in NZ, which induced the pitting corrosion in 3.5 wt% NaCl solution. The maximum corrosion depth of ST-Al/ST06 Z joint was up to 21.3 mu m at the mixed layer, which was 2.8 mu m deeper than that of ST-Al/ST16 joint at the interface between aluminum alloy and steel. Zn and Mg segregated at the grain boundaries of the mixed layer, resulting in serious intergranular corrosion. The corrosion current density of ST-Al/ST06 Z joint ((8.1 +/- 0.2) x 10(-6) A/cm(-2)) is higher than that of ST-Al/ST16 joint ((7.9 +/- 0.4) x 10(-6) A/cm(-2)) after immersion for 1 h in 3.5 wt% NaCl solution. The corrosion current densities of samples were minimum for 6 h immersion time, which was related to the passivation films and corrosion products formed on the joint surface. [GRAPHICS] .
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