直流电场对X80钢在硫酸盐还原菌体系中腐蚀行为的影响

doi:10.11896/cldb.24070129

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Abstract As high-voltage transmission lines, rail transit, and oil and gas pipelines share public transportation corridor, the produced electric field envi-ronment has an inevitable influence on the corrosion behavior of sulfate-reducing bacteria (SRB). In this work, the effect of DC electric field on the corrosion behavior of X80 pipeline steel in the sulfate-reducing bacteria environment was investigated. The SRB quantity, the concentration and valence state of sulfide ions, the characteristics of surface biofilm, corrosion rate and electrochemical process, were analyzed by biological culture technology, immersion experiment, electrochemistry and other experimental methods, combined with Na₂S₂O₃ titration technology, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), laser confocal and other analytical methods. The findings show that low voltage applied DC field promotes the growth of SRB, prolongs the life cycle of SRB, facilitates the formation of dense film layer on the surface of the matrix, and further hinders the attack of corrosive ions. While the high voltage applied DC field inhibits the growth of SRB, shortens the life cycle of SRB, and results in the film layer loose and porous. Meanwhile, the applied DC electric field changed the valency state of S element in film, high voltage applied DC field inhibits the S transformation from oxidation state (S⁶⁺) to reduction state (S^2-). The dense film with the hig-hest S^2- content and the lowest substrate corrosion rate can be obtained by applying a voltage of 500 V/m in the tested DC electric field voltage range within 0 —1 200 V/m. When the applied DC field voltage is 1 200 V/m, the content of S^2- is the lowest in the dense film. The directional migration of corrosive ions and electrons is accelerated strongly by higher field strength, and the X80 steel has the highest uniform corrosion rate and pitting corrosion rate.

Key words： sulfate-reducing bacteria electric field X80 biofilm S-ion valence pitting

Published: 10 August 2025 Online: 2025-08-13

CLC number:

TG172

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	Articles by authors
	ZHANG Yani
	DUAN Bowen
	SONG Wei
	ZHANG Chengxin
	FAN Bing
	WANG Simin

Cite this article:

ZHANG Yani,DUAN Bowen,SONG Wei, et al. Effect of DC Electric Field on the Corrosion Behavior of X80 Steel in Sulfate-reducing Bacteria System[J]. Materials Reports, 2025, 39(15): 24070129-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24070129 OR https://www.mater-rep.com/EN/Y2025/V39/I15/24070129

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