炼油装置循环水系统的微生物腐蚀早期损伤及演化模型研究

In this paper，some harmful substances contained in the oil will cause series of corrosion damage in oil refining equipment or pipelines, corrosion failure of equipment may lead to major environmental pollution and fatal accidents. Therefore, the study of corrosion mechanisms and research of anticorrosion technology are very important. In petrochemical industry, microbially influenced corrosion(MIC) is one of a major failure mode in refinery water circulation units. Microbiological induced corrosion is caused mainly by Iron-Oxidizing Bacteria (IOB) and Sulphate-Reducing Bacteria (SRB). The complexity of these substances lead to the interaction of multiple corrosive substances, which causes the investigation of corrosion problems to be very difficult. Focuse on "IOB+SRB+NaCl+H2O" multimedia corrosion solution, electrochemical tests and surface topography were utilized to study the corrosion behaviors. Experimental results show that the corrosion rate of 316L stainless steel increased orderly in IOB, SRB, IOB+SRB and IOB+SRB solution. Then, based on coupling characteristics of the mutlimedia corrosion behavior and Hydra model, a mathematical model was established to explain the evolution of autocatalytic acceleration and inhabitation, the results of theoretic research and numerial simulation show the calculation results based on the model have a good agreement with the experimental results.