高温酸化环境中吡啶季铵盐与锑离子的协同缓蚀作用

Synergistic Corrosion Inhibition Effects of Pyridine Quaternary Ammonium Salt and Antimony Cation at High Temperature Acidizing

李嘉 孙亚东 王虎

LI Jia SUN Yadong WANG Hu

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Sb2O3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+Sb2O3的成膜性能，并提出了高温酸化条件 下BDJ与Sb2O3协同缓蚀成膜的机理。研究表明：BDJ与Sb2O3协同缓蚀作用明显，且Sb2O3随着浓度增加，缓蚀 效果显著提升，当加入2% BDJ+0.5% Sb2O3时，N80 钢片在20%盐酸中的腐蚀速率可降至18.0 g/（m2·h），远低于 标准要求的腐蚀速率［45 g/（m2·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 Sb2O3 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 Sb2O3was proposed. The results showed that there existed in apparent synergistic corrosion inhibition between BDJ and Sb2O3. With the increase of Sb2O3concentration，the inhibition efficiency was remarkably enhanced. When adding corrosion inhibitor of 2% BDJ + 0.5% Sb2O3，the corrosion rate of N80 steel decreased to 18.0 g/（m2·h），which was far less than the requirement of 45 g/（m2·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.

10.19346/j.cnki.1000-4092.2023.04.023