Q235钢在含硫污水中的腐蚀行为研究  

Corrosion Behavior of Q235 Steel in Sour Water

作　　者：王际东[1] 陈旭[1] 王志斌 张玉刚 WANG Jidong CHEN Xu WANG Zhibin ZHANG Yugang(College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China Jinzhou Petrochemical Company, PETRO China, Jinzhou 121000, China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,抚顺113001 [2]中国石油锦州石化公司,锦州121000

出　　处：《腐蚀科学与防护技术》2017年第5期485-491,共7页Corrosion Science and Protection Technology

基　　金：国家自然科学基金(51201009);辽宁省自然科学基金(2013020078)~~

摘　　要：利用电化学阻抗和动电位极化技术,研究了Q235钢在不同浓度的S2-、Cl-及NH4+作用下的电化学行为,并对离子协同作用下Q235钢的腐蚀敏感性影响进行了比较分析。结果表明:Q235钢在S2-或NH4+作用下阳极极化过程呈钝态,Cl-作用下表现为活化极化。Q235钢腐蚀电流密度随Cl-或NH4+浓度的增加而增大,但随S2-浓度的增加而减小。Q235钢在碱性硫化物环境中能生成保护性钝化膜。溶液中的Cl-和S2-在钝化膜的缺陷部位吸附,破坏了钝化膜的进一步生成,使膜下金属处于活化状态,加速了腐蚀过程。Corrosion behavior of Q235 steel in solutions with different concentrations of S2-, Cl-and NH4＋was studied by means of electrochemical impedance spectroscopy（EIS） and potentiodynamic polarization technology etc. It is found that the anodic polarization process of Q235 steel was passivatedin the solution with NH4＋or S2-, and it was actively polarized in the solution with Cl-. The corrosion current density of Q235 steel increased with the increasing concentration of Cl-or NH4＋, but it decreased with the increasing concentration of S2-. The protective passivation film formed on Q235 steel in the alkaline sulfide environment. The Cl-and S2-were adsorbed at the defect of the passive film and there with the formation of the passive film was blocked, which resulted in the steel being activated under the film and the corrosion process was accelerated.

关 键 词：Q235钢 含硫污水 钝化 点蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]