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以氯甲基吡啶、炔丙醇和溴代十六烷为原料,经炔化、季铵化反应合成了一种高温型酸化缓蚀剂:溴化-N-十六烷基-2-(4-羟基丁-2-炔)吡啶(O-16),其结构通过1HNMR、13CNMR和MS表征。用失重法、极化曲线法和交流阻抗法评价了O-16在HCl介质中对X70钢的缓蚀性能。结果表明,O-16对X70钢具有优异的缓蚀效果。在60℃,w(HCl)=20%的水溶液中,缓蚀率随O-16浓度的增加而增大,当O-16浓度为3×10-5mol/L时,缓蚀率达到99%。极化曲线法表明,O-16是以阴极抑制为主的混合型缓蚀剂。协同效应研究表明,O-16缓蚀剂分子内协同效应大于分子间协同效应,这为进一步寻找高温强酸型缓蚀剂指明了方向。同时用SEM观察了X70钢表面的形貌特征。
Chloromethyl pyridine, propargyl alcohol and hexadecyl bromide were used as raw materials to synthesize a high-temperature acidification inhibitor through alkynylation and quaternization: N-hexadecyl-2- (4 Hydroxybut-2-yne) pyridine (O-16) whose structure is characterized by 1H NMR, 13CNMR and MS. The corrosion inhibition performance of O-16 on X70 steel in HCl medium was evaluated by weight loss method, polarization curve method and AC impedance method. The results show that O-16 has excellent corrosion inhibition effect on X70 steel. The corrosion inhibition rate increases with the increase of O-16 concentration in aqueous solution of w (HCl) = 20% at 60 ℃. When the concentration of O-16 is 3 × 10-5mol / L, the corrosion inhibition rate reaches 99% . Polarization curve method shows that O-16 is a mixed-type corrosion inhibitor mainly based on cathodic inhibition. The synergistic effect shows that the intramolecular synergistic effect of O-16 inhibitor is larger than that of intermolecular synergistic effect, which indicates the direction for further searching for high temperature and strong acid corrosion inhibitor. Meanwhile, the surface features of X70 steel were observed by SEM.