温度对管线钢在SRB/CO<sub>2</sub>环境中的腐蚀影响

doi:10.11896/cldb.23070058

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Abstract The present work explored the effect of temperature on its corrosion performance, and investigated the corrosion characteristics of X65 pipeline steel in sulfate reducing bacteria (SRB)/saturated CO₂ environment. Immersion and electrochemical tests were conducted on X65 pipeline steel at three temperature levels of 20 ℃, 40 ℃, and 60 ℃. The changes in SRB in the solution at high temperature were detected through 16S rRNA gene sequencing, and the surface morphology and pitting characteristics after corrosion were observed. The results showed that as temperature of the solution increased, SRB metabolism accelerated. Thermophilic SRB preferentially proliferated at high temperatures, and together with other thermophilic bacteria that produce S^2-, it accelerated the generation of S^2-, promoting the transition of S from an oxidizing state to a reducing state, and depositing it in corrosion products. At 40 ℃, the number of SRBs was the highest and the pitting rate was the highest, which could be attributed to the adsorption of SRBs on the surface of the sample. In the adsorption area of the SRB community, the reduction effect on the sample surface was enhanced, local cathodic reactions were accelerated too, and corrosion pores were generated. At 60 ℃, the uniform corrosion rate was the highest, the ion mass transfer was accelerated, and the thermophilic SRB genus largely proliferated. The combined action of microorganisms and CO₂ caused severe uniform corrosion.

Key words： microbial corrosion sulfate-reducing bacteria biofilm temperature pitting

Published: 10 December 2024 Online: 2024-12-10

CLC number:

TG172.4

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	Articles by authors
	PEI Wenxia
	ZHAO Guoxian
	DING Langyong
	FANG Kun
	WANG Fan
	LIU Ranran

Cite this article:

PEI Wenxia,ZHAO Guoxian,DING Langyong, et al. Effect of Temperature on Corrosion of Pipeline Steel in SRB/CO₂ Environment[J]. Materials Reports, 2024, 38(23): 23070058-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23070058 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23070058

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