茴三硫作为一种新型高效缓蚀剂对铜在0.5 mol/L硫酸溶液中的缓蚀性能  

Determination of Corrosion Inhibition of Copper in 0.5 mol/L Sulfuric Acid Solution by Anethole Trithione as a New High-efficiency Corrosion Inhibitor

作　　者：张金亮[1] 梁会军 金向红[1] 刘新文[1] 洪晓波[1] ZHANG Jin-liang;LIANG Hui-jun;JIN Xiang-hong;LIU Xin-wen;HONG Xiao-bo(School of Materials and Chemical Engineering,Ningbo University of Technology,Ningbo 315211,China;Sinopec Oil&Gas Pipe Line Inspection Co.,Ltd,Xuzhou 221000,China)

机构地区：[1]宁波工程学院材料与化学工程学院,浙江宁波315211 [2]中石化长输油气管道检测有限公司,江苏徐州221000

出　　处：《表面技术》2019年第10期292-300,共9页Surface Technology

摘　　要：目的探究茴三硫对铜在硫酸溶液中的缓蚀性能。方法使用电化学阻抗谱和动电位极化曲线,探究在不同温度下茴三硫对铜在硫酸溶液中的缓蚀性能,凭借扫描电子显微镜和原子力显微镜观察铜样品在不同条件下的表面形貌,利用极化曲线数据对多种吸附等温方程进行拟合,探究茴三硫在铜表面的吸附类型。结果电化学测试结果表明,茴三硫浓度为5 mmol/L,温度为25℃时,缓蚀效率高达97.8%,并且随着温度的升高,缓蚀效率增强;在温度为40℃,浓度为5 mmol/L时,利用极化曲线和阻抗谱得到的缓蚀效率分别为98.9%和99.8%。另外,扫描电子显微镜和原子力显微镜的测试结果有力地佐证了茴三硫能够有效地减缓铜在硫酸介质中的腐蚀。观察吸附等温模型发现,茴三硫在铜表面的吸附符合Langmuir单层吸附,在25、30、35、40℃时的DG0 ads值分别为–31.36、–33.80、–36.87、–37.13 kJ/mol。结论茴三硫对铜在硫酸溶液中具有良好的缓蚀作用,并且随着温度的增大,缓蚀性能增强。DG0 ads值表明,茴三硫在铜表面的吸附属于物理和化学吸附的共同作用,并且随着温度的升高,化学吸附的作用更加明显。The work aims to investigate the corrosion inhibition performance of anethole trithione for copper in sulfuric acid solution.Electrochemical impedance spectroscopy and potentiodynamic polarization curves were used to investigate the corrosion inhibition performance of anethole trithione on copper in sulfuric acid solution at different temperature.Scanning electron microscopy and atomic force microscopy were used to observe the surface morphology of copper samples under different conditions.A variety of adsorption isotherms were fitted by polarization curve data to explore the adsorption type of anethole trithione on copper surface.Electrochemical test results showed that when the anethole trithione concentration was 5 mmol/L,the inhibition efficiency was as high as 97.8%at 25℃,and the corrosion inhibition efficiency increased with the increase of temperature.At the temperature of 40℃,the concentration of anethole trithione was 5 mmol/L and the corrosion inhibition efficiencies obtained by polarization curve and impedance spectroscopy were 98.9%and 99.8%,respectively.In addition,the results of scanning electron microscopy and atomic force microscopy strongly supported the fact that anethole trithione could effectively slow the corrosion of copper in sulfuric acid medium.Through the adsorption isotherm model,it was found that the adsorption of anethole trithione on copper surface accorded with Langmuir monolayer adsorption.The values ofDG0 ads at 25,30,35 and 40℃were–31.36,–33.80,–36.87 and–37.13 kJ/mol.Anethole trithione has good corrosion inhibition effect on copper in sulfuric acid solution,and its corrosion inhibition performance increases with increasing temperature.The values ofDG0 ads indicate that the adsorption of anethole trithione on the copper surface is a combination of physical and chemical adsorption,and the effect of chemisorption is more pronounced with increasing temperature.

关 键 词：茴三硫 缓蚀剂 铜 电化学阻抗谱 动电位极化曲线 Langmuir单层吸附 

分 类 号：TG174.42[金属学及工艺—金属表面处理]