强酸环境中溴化-N-烷基炔醇吡啶对X70钢的缓蚀性能  

Corrosion inhibition of N-alkyl alkynyl pyridinium bromide on X70 steel in high acidic media

作　　者：涂胜 李鹏熙 汤琪 饶晓蓓 TU Sheng;LI Pengxi;TANG Qi;RAO Xiaobei(School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 402247,China;Environment and Quality Test Department,Chongqing Chemical Industry Vocational College,Chongqing 401228,China)

机构地区：[1]重庆交通大学材料科学与工程学院,重庆402247 [2]重庆化工职业学院环境与质量检测学院,重庆401228

出　　处：《高校化学工程学报》2024年第6期941-950,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：重庆市自然科学基金(cstc2021jcyj-msxmX0242)。

摘　　要：为防止X70钢在强酸环境中的腐蚀行为,开发新的缓蚀剂成为迫切需求。以2-氯甲基吡啶、炔丙醇和溴代十四烷为原料,经炔化、季铵化得缓蚀剂溴化-N-烷基炔醇吡啶(NTHPB),其结构经核磁共振谱(^(1)H-NMR、^(13)C-NMR)、质谱(MS)和红外光谱(FTIR)证实。采用失重法、极化曲线法和交流阻抗法评价了NTHPB在5 mol·L^(-1) HCl中对X70钢的缓蚀性能,用扫描电镜、X-衍射仪、紫外光谱和接触角研究了NTHPB在X70钢表面的吸附行为。结果表明,NTHPB对X70钢的缓蚀性能非常优异,5×10^(-5 )mol·L^(-1)的NTHPB在60℃、5 mol·L^(-1) HCl中对X70钢的缓蚀率高达99.54%,且缓蚀率随NTHPB浓度的增加而增加,随温度的升高而降低。NTHPB在X70钢表面的吸附属于物理和化学混合吸附的自发放热过程,遵循Langmuir等温吸附规律。本研究为抗强酸、高性能缓蚀剂的开发设计指明了新的方向。To prevent corrosion of X70 steel in high acidic media,N-alkyl alkynyl pyridinium bromide(NTHPB)was synthesized by acetylation and quaternary ammonium reaction using 2-chloromethyl pyridine,propargyl alcohol and tetradecane bromide as start materials,and its structure was confirmed by ^(1)H-NMR,^(13)C-NMR,MS and FTIR.The corrosion inhibition performance of NTHPB on X70 steel in 5 mol×L^(-1) HCl was evaluated by weight loss,polarization curve and AC impedance methods,the adsorption behavior of NTHPB on X70 Steel was investigated by SEM,XRD,UV and contact angle.The results show that NTHPB has excellent corrosion inhibition performance on X70 steel.The inhibition efficiency of NTHPB at 5×10^(-5)mol×L^(-1) reached 99.54%at 60℃in 5 mol×L^(-1) HCl,and the inhibition efficiency increased with the increase of concentration of NTHPB and decreased with the increase of temperature.The adsorption of NTHPB on X70 steel was a spontaneous exothermic adsorption process,which is due to the combination of physical and chemical adsorption and conforms to the Langmuir isothermal adsorption rule.This study presents a new direction for the development and design of corrosion inhibitors with strong acid resistance and high performance.

关 键 词：溴化N-烷基炔醇吡啶 缓蚀剂 X70钢 吸附 缓蚀机理 

分 类 号：O626.32[理学—有机化学] TG174.42[理学—化学]