Unique corrosion reinforcement mechanism of pipeline oil sludge with sulfate-reducing bacteria on X60 steel and the targeted long-term inhibition of dazomet delivery

Abstract

The mutual promotion behavior of pipeline oil sludge and wild SRB on pipeline steel corrosion was investigated. The resistance probe technique was used for long-term monitoring of MIC underneath SRB oil sludge. Corrosion of pipeline steel under oil sludge was the result of multifactorial coupling. SRB biofilm enhanced the conductivity of the oil sludge that serves as an electron transfer "bridge" between the SRB and carbon steel, accelerating the extracellular electron transfer process of MIC, and hence the dissolution of the carbon steel. Delivery of dazomet (DMTT) was a long-term strategy for mitigating pipeline corrosion under SRB oil sludge.