焊管2026，Vol.49Issue(8)：85-92,8.DOI:10.19291/j.cnki.1001-3938.2026.08.010
壳聚糖缓蚀剂对油井管N80钢细菌腐蚀行为的影响研究
Study on Effect of Chitosan on Bacterial Corrosion Behavior of N80 Steel in Oil Well Pipes
摘要
Abstract
Microbial corrosion induced by sulfate-reducing bacteria(SRB)represents a significant threat to the structural integrity and operational safety of oil and gas pipelines.The addition of corrosion inhibitors is an effective protective measure,but the influence of the surface condition of the substrate on the corrosion inhibition performance of the inhibitors still needs to be further explored.The matching effect of N80 steel and corrosion inhibitor under different surface roughness was studied using weight loss method,surface analysis,and electrochemical testing,as well as the corrosion inhibition effect and mechanism of different concentrations of chitosan on N80 steel in SRB environment.Results indicate that reducing surface roughness is beneficial for removing surface oxides,evenly distributing corrosion inhibitors,and thus reducing corrosion rates.As the chitosan concentration increased from 0.1 g/L to 0.4 g/L,the corrosion of N80 steel shifted from moderate to mild.The self corrosion current and corrosion rate first rapidly decrease and then slowly increase,indicating that the concentration should not be too high.The corrosion inhibition rate is highest at 0.3 g/L,reaching 71%.This is attributed to the lone pair electrons from hydroxyl and amino functional groups in chitosan molecules,which can coordinate with vacant orbitals on the metal surface,leading to the formation of a dense protective film.This film effectively blocks SRB and corrosive organic acids and H2S produced by their metabolism,thereby preventing the formation of active corrosion sites on the steel substrate and effectively inhibiting the corrosion of N80 steel.However,excessive concentration of chitosan can cause molecular chain entanglement and aggregation,resulting in the formation of pores in the membrane layer,which in turn promotes SRB adhesion and corrosion.关键词
N80钢/壳聚糖缓蚀剂/细菌腐蚀/表面粗糙度/缓蚀机理Key words
N80 steel/chitosan corrosion inhibitor/bacterial corrosion/surface roughness/corrosion inhibition mechanism分类
矿业与冶金引用本文复制引用
胥聪敏,杨旭晨,李城臣,马墨涵..壳聚糖缓蚀剂对油井管N80钢细菌腐蚀行为的影响研究[J].焊管,2026,49(8):85-92,8.基金项目
国家自然科学基金项目"(超)深高含硫气井极端工况下TC4油管点蚀机理微观尺度研究"(项目编号51974245) （超）
陕西省重点研发计划项目"MICI生物防治技术控制MIC机制研究与新型生物抑菌研发"(项目编号2026CY-YBXM-691) （项目编号2026CY-YBXM-691）
西安石油大学研究生创新与实践能力培养项目"生物竞争对原油储罐细菌腐蚀行为的影响研究"(项目编号YCX2512054). （项目编号YCX2512054）
