摘要
吡啶季铵盐和锑盐常常作为高温酸化缓蚀剂的组分,将两者复配协同增效也常常被应用于高温酸化的缓蚀剂应用中。运用高温高压化学浸泡和电化学测试技术,研究了2-甲基吡啶季铵盐(BDJ)与不同浓度Sb_(2)O_(3)在20%HCl中对N80钢的协同缓蚀作用,并通过接触角测试、扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射技术(XRD)及全反射红外光谱(ATR)探究了高温高压下缓蚀剂BDJ+Sb_(2)O_(3)的成膜性能,并提出了高温酸化条件下BDJ与Sb_(2)O_(3)协同缓蚀成膜的机理。研究表明:BDJ与Sb_(2)O_(3)协同缓蚀作用明显,且Sb_(2)O_(3)随着浓度增加,缓蚀效果显著提升,当加入2%BDJ+0.5%Sb_(2)O_(3)时,N80钢片在20%盐酸中的腐蚀速率可降至18.0 g/(m^(2)·h),远低于标准要求的腐蚀速率[45 g/(m^(2)·h)],且缓蚀效率超过95%。混合缓蚀剂导致腐蚀电位正移,降低了腐蚀反应的热力学倾向。缓蚀剂协同作用形成了锑单质+BDJ的复合相膜,进而有效地增加界面接触角,抑制酸腐蚀。
As important ingredients in corrosion inhibitor at high temperature acidizing,pyridine quaternary ammonium salt and antimony salt have been universally used in application.In this paper,chemical soaking at high temperature and high pressure and electrochemical measurements was carried out to investigate the synergistic corrosion inhibition effects between pyridine quaternary ammonium salt(BDJ)and Sb_(2)O_(3) on N80 steel in 20%HCl solution.The performance of the formed film at different conditions was analyzed using contact angle,scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),X-ray diffraction(XRD)and attenuated total reflectance(ATR).The mechanism of film forming process of acidizing corrosion inhibitor relating BDJ and Sb_(2)O_(3) was proposed.The results showed that there existed in apparent synergistic corrosion inhibition between BDJ and Sb_(2)O_(3).With the increase of Sb_(2)O_(3) concentration,the inhibition efficiency was remarkably enhanced.When adding corrosion inhibitor of 2%BDJ+0.5%Sb_(2)O_(3),the corrosion rate of N80 steel decreased to 18.0 g/(m^(2)·h),which was far less than the requirement of 45 g/(m^(2)·h),as a result,the inhibition efficiency increased over 95%.The mixture inhibitor shifted the potential positively and decreased the corrosion tendency thermodynamically.The protective film was consisted of compound film with Sb and BDJ inside,which effectively enlarged the contact angle and inhibited the acid corrosion.
作者
李嘉
孙亚东
王虎
LI Jia;SUN Yadong;WANG Hu(Sichuan Chuanqing Downhole Technology Company Ltd,Deyang,Sichuan 618000,P R of China;School of Materials Science and Engineering,Southwest Petroleum University,Chendu,Sichuan 610500,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2023年第4期716-722,735,共8页
Oilfield Chemistry
关键词
酸化缓蚀剂
吡啶季铵盐
锑离子
协同作用
corrosion inhibitor in acidizing
pyridine ammonium quaternary salt
antimony cation
synergistic effect
