Abstract: In recent years, pipeline leakage accidents occurred frequently in the process of oil and gas transportation, which not only threatens the safe operation of pipelines, but also causes environmental pollution and huge economic losses. Corrosion is the main reason of pipeline leakage. Pipeline steels are widely laid in soils and undersea environments. There are always complex corrosion characteristics in these environments. Corrosive anions, microbes, temperature, dissolved oxygen, pH, and other factors can cause the corrosion of pipeline steels. Therefore, under the combined action of these factors, corrosion of pipeline steels is unavoidable. Among them, anions and sulfate-reducing bacteria (SRB) are the main reason for the corrosion of pipeline steels. In the service environment of pipeline steel, there may be corrosive anions like Cl-, SO42-, CO32-, NO3-, S2-, etc. Among them, Cl- and SO42- are the most common, and related researches on these two kinds of anions are more adequate. There is a gene-ral consensus among the researchers about the effect of Cl- on the corrosion of pipeline steel. Namely, with the increase of Cl- concentration, the corrosion rate of pipeline steel will be accelerated. However, there is still no unified view regarding to the effect of SO42- on the corrosion of pipeline steel. Besides, great efforts have been put into the research work about the influence of SRB on the corrosion behavior of pipeline steel. Some results indicate that the metabolism of SRB will accelerate the corrosion of pipeline steel, and others suggest that SRB will generate biofilm on the surface of pipeline steel, protecting metal and slowing down the corrosion of pipeline steel. Nowadays, researchers begin to realize that the influencing factors of pipeline steel corrosion are the result of the combination of environmental factors instead of a single environmental factor. Therefore, the synergistic effect of anions and SRB on the corrosion behavior of pipeline steel has become the focus of current research. It has been found that when anions coexist with SRB, anions can affect the corrosion behavior of pipeline steel by changing the activity of SRB. The current research mainly focuses on the coexistence of Cl- and SRB. The salinity of the medium can be reflected by Cl- concentration, and the salts can alter the microbial activity by changing the osmotic pressure in water containing microorga-nisms, affecting the transport of bacterial substances. When the content of Cl- in the corrosive medium is high, the growth and reproduction of SRB will be inhibited, most of the SRB cells will dehydrate and die, and no obvious microbial corrosion occur. While in the environment where the content of Cl- is not high enough for the growth of SRB, SRB will work together with Cl- to induce significant microbial corrosion of metals. In this article, the effects of anions and SRB on corrosion behavior of pipeline steels are reviewed. The synergistic effects of SRB and anions on the corrosion behavior of pipeline steel are summarized. The existed defects and deficiencies were analyzed and the further research direction on these issues was also prospected.
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