Abstract
Underground pipelines buried deeper than 1.5 m or in specific soil conditions are susceptible to microbial corrosion and dynamic alternating current (AC) interference. Yet, research on the coupled effects of these factors remains limited, leaving their mechanisms unclear. The study employed microbial activity tests, electrochemical experiments, and microscopic morphology characterization to elucidate the coupled effect of sulfate-reducing bacteria (SRB) and dynamic AC interference on buried metallic pipelines. Results show that sinusoidal AC significantly reduces SRB growth activity. Initially, the active microbial film produced by microbial metabolism inhibited corrosion but later exacerbating it as the microbial film detachment. Microscopic examination reveals as the interference time increases, the corrosion morphology changed from pitting corrosion to honeycomb/ulcer shapes, under SRB and different AC interference conditions. Moreover, sulfide corrosion products and iron phosphide formation accelerate corrosion, while rectification and alternating electric field effects further aggravate the process. These findings provide insights into the complex mechanisms of microbial and AC corrosion in buried pipelines, aiding in anti-corrosion strategies and layout optimization.
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