Abstract
The microbiologically influenced corrosion (MIC) behavior of the copper-nickel (Cu-Ni) alloy welded joint induced by Desulfovibrio vulgaris was investigated. Distinct gradient changes in MIC behavior were observed in different regions, with the heat-affected zone (HAZ) consistently exhibiting higher localized corrosion sensitivity. Specifically, the asymmetric corrosion of HAZ was attributed to the galvanic effect between HAZ and welding zone (WZ). On a submicroscopic scale, the WZ acted as a cathode, mitigating corrosion in the later stages of Desulfovibrio vulgaris incubation. Additionally, the deep corrosion propagation at the HAZ/WZ interface was caused by the combined action of galvanic effect and Desulfovibrio vulgaris.
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