酸化缓蚀剂缓蚀性能的实验和理论评价

Experimental and Theoretical Evaluation of Corrosion Performance for Acidizing Corrosion Inhibitor

雷永永 李继勇 张云芝 渠慧敏 张宏玉

LEI Yongyong LI Jiyong ZHANG Yunzhi QU huimin ZHANG Hongyu

为深入研究酸化缓蚀剂的缓蚀作用机理，将实验方法与量子化学、分子动力学相结合分析缓蚀剂分子结构与缓蚀率之间的关系。采用挂片失重法测得五种酸化缓蚀剂甘氨酸，N-［N-［（苯甲氧基）羰基］氨基乙酰基］-，4-硝基苯酯（A）、Nα，Nω-二苄氧羰基-L-精氨酸（B）、（R）-2-［N-（N-苄基脯氨酰）氨基］二苯甲酮（C）、4-［（4-甲氧亚苄基）氨基］肉桂酸乙酯（D）、5-羟基色氨酸（E）在15% HCl 溶液中的缓蚀率，并用金相显微镜观察了腐蚀后N80 钢挂片的3D形貌，最后用量子力学和分子动力学相结合的模拟方法对5 种缓蚀剂的缓蚀性能进行了理论分析。结果表明，5 种酸化缓蚀剂的缓蚀率均大于93%，酸化缓蚀剂缓蚀效果按缓蚀率大小排序为：B>A>D>C>E，按平均点蚀深度排序为：B>A>D>C>E，按最大点蚀深度排序为：A>B>D>C>E，其中B、D抑制点蚀效果较差；通过量子化学计算得到的酸化缓蚀剂缓蚀性能从大到小依次为：A>B>D>C>E，通过分子力学计算得到的缓蚀性能从大到小依次为：A>B>C>D>E，理论分析与实验结果基本相符。图15 表5 参20

In order to further study the corrosion mechanism of acidizing corrosion inhibitor，the relationship between molecular structure and inhibition efficiency of corrosion inhibitor was analyzed by combining experimental method with quantum chemistry and molecular dynamics. The inhibition efficiency of five acidizing corrosion inhibitors in 15% HCl solution was measured by weight loss method，such as glycine，N-［N-［（phenylmethoxy）carbonyl］glycyl］-，4-nitrophenyl ester（A），Nα，ω-dicarbobenzoxy-L-arginine （B），N-（2-benzoylphenyl）-1-benzylpyrrolidine-2-carboxamide（C），ethyl（E）-3-（4-（（（E）-4-methoxybenzylidene）amino）phenyl） acrylate（D），2-amino-3-（5-hydroxy-1H-indol-3-yl propanoic acid（E）. And the 3D morphology of N80 steel after corrosion was observed by metallographic microscope. Finally，the corrosion inhibition performance of five corrosion inhibitors was analyzed by the combination of quantum mechanics and molecular dynamics. The results showed that the inhibition efficiency of five acidizing corrosion inhibitors was above 93%. The inhibition effects of five acidizing corrosion inhibitors were arranged according to the order of inhibition efficiency in following order：B>A>D>C>E，according to average pitting depth in following order：B>A>D>C>E，and according to maximum pitting depth in following order：A>B>D>C>E. B and D corrosion inhibitor had poor inhibitory effect of pitting corrosion. The corrosion inhibition performances of five corrosion inhibitors were arranged according to the calculated results by quantum chemistry in following order：A>B>D>C>E，and according to the calculated results by molecular mechanics in following order：A>B>C>D>E，which agreed with the experimental results.

10.19346/j.cnki.1000-4092.2018.01.005