Abstract
Galvanic corrosion and localized corrosion behavior of AA5052/weld seam/304SS tri-metallic couples were examined by EIS, ZRE, SKP and SVET tests after tungsten inert gas (TIG) arc welding. The results showed that the weld seam had a relatively high corrosion susceptibility. The asymmetric corrosion of weld seam was attributed to the macro-galvanic effect between the weld seam/AA and the weld seam/SS. Localized corrosion of Zn in δ-FeZn10 induced the corrosion trenches and channels initiation. The deep corrosion propagation at the weld seam/SS interface was brought on by local acidity and micro-galvanic effect.
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