摘要
目的合成一种新型的环境友好型缓蚀剂,并研究缓蚀剂对Q235低碳钢在1 mol/L盐酸溶液(25℃)中的缓蚀性能。方法将AM(丙烯酰胺)、MAA(甲基丙烯酸)、AMPS(2-丙烯酰胺-2-甲基丙磺酸)、AMHB(3-(丙烯酰胺基甲基)-2-羟基苯甲酰胺)和SMA(甲基丙烯酸十八酯)按照一定配比,通过加热搅拌合成出一种新型含有辣椒素衍生单体的疏水缔合物PAMAAS。利用失重法、电化学方法、表面分析手段以及理论计算评估PAMAAS的缓蚀效率。结果PAMAAS对低碳钢具有优异的缓蚀性能,当质量浓度为2 g/L时,失重缓蚀效率最高能达到92.56%。单体对照的失重实验结果表明,聚合物的缓蚀效率高于单体的缓蚀效率。电化学实验测试表明,当缓蚀剂质量浓度为2 g/L时,缓蚀效率可以达到92%左右。通过交流阻抗测试分析以及接触角测试可知,PAMAAS缓蚀剂在碳钢表面形成了一层高疏水性(141.2°)的吸附膜。扫描电镜和激光共聚焦显微镜发现,在有缓蚀剂存在下,碳钢表面得到了非常好的保护。通过吸附模型的拟合分析得知,缓蚀剂PAMAAS是以化学吸附为主的混合吸附方式吸附在低碳钢表面,并且其吸附模型遵循Langmuir吸附等温线,其拟合回归系数达到0.9999。对聚合物单体的量子化学计算表明,聚合物的缓蚀性能要优于单体的缓蚀性能,这与单体对照的失重实验结果相一致。结论PAMAAS是一种高效环保的混合抑制型缓蚀剂。
The work aims to synthesize a new type of environmentally friendly corrosion inhibitor,and study the corrosion inhibition performance of corrosion inhibitor on Q235 mild steel in 1 mol/L hydrochloric acid solution at 25℃.AM(acrylamide),MAA(methacrylic acid),AMPS(2-acrylamide-2-methylpropanesulfonic acid),AMHB((3-acrylamidomethyl)-2-hydroxybenzamide)and SMA(octadecyl methacrylate)were heated and stirred to synthesize a new type of hydrophobic association complex containing capsaicin-derived monomer PAMAAS according to a certain ratio.The weight loss experiment,electrochemical method,surface analysis method and theoretical calculation were used to evaluate the corrosion inhibition efficiency of PAMAAS.PAMAAS had excellent corrosion inhibition performance on mild steels.When the mass concentration was 2 g/L,the weight loss inhibition efficiency reached 92.56%.The weight loss experiment results of monomer control showed that the efficiency of polymer was higher than that of the monomer.Electrochemical experiments showed that when the inhibitor mass concentration was 2 g/L,the corrosion inhibition efficiency reached about 92%.According to the analysis of electrochemical impedance spectroscopy test and contact angle test,PAMAAS corrosion inhibitor formeda highly hydrophobic(141.2°)adsorption film on the surface of mild steel.From the scanning electron microscopy and laser confocal microscopy,the surface of mild steel was well protected in the presence of corrosion inhibitors.According to the fit analysis of the adsorption model,it was found that the inhibitor PAMAAS was adsorbed on the surface of mild steel by chemical adsorption-based mixed adsorption,and its adsorption model followed the Langmuir adsorption isotherm,and its fitting regression coefficient reached 0.9999.Quantum chemical calculations of the polymer monomers showed that the corrosion inhibition performance of the polymer was better than that of monomer,which was consistent with the results of weight loss experiments of the monomer control.PAMAAS is a
作者
饶兴兴
王璇
王言建
夏树伟
于良民
RAO Xing-xing;WANG Xuan;WANG Yan-jian;XIA Shu-wei;YU Liang-min(Ocean University of China,Qingdao 266100,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第11期252-261,共10页
Surface Technology
基金
国家自然科学基金委员会-山东省人民政府联合基金(U1706225)
中央高校基本科研业务费专项资金(201762029)。
关键词
缓蚀剂
环境友好
吸附
电化学
表面分析
聚合物
corrosion inhibitor
environmentally friendly
adsorption
electrochemical
surface analysis
polymer
