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以N-乙烯基咪唑单体为原料,偶氮二异丁腈为引发剂,苯为溶剂,合成聚N-乙烯基咪唑(PVI)。采用静态失重法、Tafel极化曲线以及电化学阻抗法研究不同温度和含量下PVI在HCl溶液中对Q235钢的缓蚀性能,并研究了其缓蚀机理及缓蚀剂吸附方式。结果表明:在298K下,1 mol·L-1HCl溶液中,缓蚀剂浓度为2mg·L-1时,缓蚀效率达到90.1%,在高温(328 K),高酸(2 mol·L-1)下的缓蚀率仍可达到84%以上。电化学测试结果表明,PVI属于混合型缓蚀剂,与金属的吸附符合Langmuir吸附等温关系式;吸附自由能结果表明,缓蚀剂具有强烈的在金属上吸附的倾向,主要以化学吸附方式为主。
Using N-vinylimidazole monomer as raw material, azobisisobutyronitrile as initiator and benzene as solvent, poly-N-vinylimidazole (PVI) was synthesized. The corrosion inhibition behavior of PVI in Q215 steel under different temperature and content was studied by static weight loss method, Tafel polarization curve and electrochemical impedance spectroscopy. The corrosion inhibition mechanism and corrosion inhibitor adsorption mode were also studied. The results showed that under the condition of 1 mol·L-1 HCl at 298K, the corrosion inhibition efficiency reached 90.1% at the concentration of 2 mg · L-1 and at high temperature (328 K) and 2 mol·L- 1) under the corrosion rate can still reach more than 84%. The results of electrochemical tests showed that PVI belongs to a mixed corrosion inhibitor and the adsorption of metal with the metal is in accordance with the Langmuir adsorption isotherm. The results of adsorption free energy show that the corrosion inhibitor has a strong tendency to adsorb on the metal mainly by chemical adsorption the Lord.