摘要
陕北某油田的钻井废液中富集铁细菌,用Stoke培养基和CGY培养基对其进行筛选、分离与纯化,得到1株铁细菌纯菌株。采用腐蚀失重法、电化学测试法和扫描电镜(SEM)研究铁细菌对J55钢的腐蚀行为。结果表明:筛选的铁细菌具有典型的普鲁士蓝阳性反应。失重分析表明铁细菌对J55钢腐蚀速率的影响先减小后增大,极化曲线和电化学阻抗谱结果表明,试样的自腐蚀电流密度先减小后增大,交流阻抗先增大后减小。扫描电镜结果显示,电极表面形成了致密的腐蚀产物膜。
Iron bacteria were enriched from an oilfield drilling waste in northern Shaanxi,Stoke medium and CGY medium were sued to screen,separatie and purify the baceria,apure iron bacteria strain was obtained.Weight loss method,electrochemical test and scanning electron microscopy（SEM）were used to study the effect of iron bacteria strain on corrosion behavior of J55 steel.The results showed that the iron bacteria strain had typical prussian blue positive reaction.Weight loss method showed that the effect of iron bacteria on corrosion rate of J55 steel decreased and then increased;polarization curves and electrochemical impedance spectroscopy（EIS）results showed that corrosion current density of the sample first decreased and then increased,ac impedance first increased and then decreased.SEM showed that a dense corrosion product film formed on electrode surface.
出处
《腐蚀与防护》
CAS
北大核心
2016年第3期206-209,共4页
Corrosion & Protection
关键词
铁细菌
分离
腐蚀失重
极化曲线
iron bacteria
separation
corrosion weight loss
polarization curve
