摘要
目的制备高效、经济的邻菲罗啉衍生物缓蚀剂。方法采用失重法、极化曲线、电化学阻抗法研究邻菲罗啉(PHEN)及其衍生物2-苯基-1H-咪唑[4,5-f]-1.10邻菲罗啉(PIPH)在不同浓度、不同温度下,在盐酸溶液中对低碳钢的缓蚀性能。采用扫描电镜(SEM)观测了未添加和添加不同缓蚀剂时低碳钢表面的腐蚀形貌。利用量子化学计算初步探讨了PHEN和PIPH分子结构与缓蚀效能的关系。结果 PHEN和PIPH的缓蚀效率均随着浓度的增加而增加,随着温度的升高而降低,在相同条件下,PIPH的缓蚀性能好于PHEN。30℃、缓蚀剂浓度为1mmol/L时,PHEN和PIPH的缓蚀效率最高,分别为97.4%和99.5%。缓蚀剂在低碳钢表面遵循Langmiur吸附,△G_(ads)^-分别为-21.44和-24.28 kJ/mol。电化学测试结果显示,二者均为以阳极抑制为主的混合型缓蚀剂。扫描电镜结果显示,缓蚀剂有效抑制了盐酸对低碳钢的腐蚀。结论 PHEN和PIPH这两种缓蚀剂在1 mol/L盐酸介质中均表现出良好的缓蚀性能,且含有多氮吸附中心的PIPH缓蚀效果明显好于PHEN。
The work aims to prepare an effective and economical inhibitor of phenanthroline derivative.The corrosion inhibition ability of 1,10-phenanthroline(PHEN)and its derivative 2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline(PIPH)on mild steel in HCl solution was investigated at various concentrations and temperatures by weight loss,polarization curves and electrochemical impedance spectroscopy.The surface morphology of mild steel without and with different corrosion inhibitors was observed by scanning electron microscope(SEM)and then the relationship between the molecular structure of PHEN and PIPH and their inhibitory properties was discussed with theoretical calculations.Inhibition efficiency of the PHEN and PIPH increased with the increase of concentration,but decreased as the temperature increased.In the same condition,the corrosion inhibition of PIPH was better than that of PHEN.The PHEN and PIPH showed the maximum inhibition efficiencies of 97.4%and 99.5%at 30℃with the concentration of 1 mol/L.PHEN and PIPH obeyed the Langmuir adsorption isotherm on metal surface and△Gads^■was respectively-21.44 and-24.28 kJ/mol.From the results of electrochemical experiment,both inhibitors were the mixed-type inhibitor mainly focusing on cathodal depression.The SEM observations showed that the inhibitors could inhibit corrosion of mild steel in HCl effectively.The inhibitors PHEN and PIPH show excellent corrosion performance in 1.0 mol/L HCl and PIPH with multiple adsorption centers has better inhibition property than PHEN.
作者
吕艳丽
王艳秋
周丽
汪琦
金辉
李晓
LYU Yan-Li;WANG Yan-qiu;ZHOU Li;WANG Qi;JIN Hui;LI Xiao(School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2018年第10期51-58,共8页
Surface Technology
基金
辽宁省教育厅科技计划项目(2016TSPY09)~~
关键词
低碳钢
缓蚀剂
邻菲罗啉
盐酸溶液
吸附机理
缓蚀性能
mild steel
corrosion inhibitors
phenanthroline
HCl solution
adsorption mechanism
inhibitory property
