赖氨酸席夫碱合成及缓蚀性能的创新实验设计  

Comprehensive Experiment about Synthesis and Corrosion Inhibition of Lysine Schiff Base

作　　者：田会娟 孟君[1] 吕燕[1] 洪岩 TIAN Hui-juan;MENG Jun;LV Yan;HONG Yan(School of New Material and Chemical Engineering,Tangshan University,Tangshan 063000,China;Qian′an Hongao Industry and Trade Co.Ltd.,Qian′an 063000,China)

机构地区：[1]唐山学院新材料与化学工程学院,河北唐山063000 [2]迁安市宏奥工贸有限公司,河北迁安063000

出　　处：《安徽化工》2024年第2期177-180,200,共5页Anhui Chemical Industry

基　　金：唐山学院校级教育教学改革研究与实践项目(JG22238)。

摘　　要：设计了环保型赖氨酸席夫碱的无溶剂合成及缓蚀性能测试的创新实验。以赖氨酸和香草醛为原料,采用无溶剂法合成赖氨酸席夫碱,并通过外红光谱对产物结构进行了表征。采用失重法和电化学方法研究了赖氨酸席夫碱缓蚀剂在30℃、0.5 mol·L^(-1)的H_(2)SO_(4)溶液中对Q235钢的缓蚀作用,探讨了缓蚀机理,并对赖氨酸席夫碱进行了吸附热力学研究。实验结果表明:与赖氨酸相比,相同添加量时,赖氨酸席夫碱的缓蚀率更高。当赖氨酸席夫碱添加量为500 mg·L^(-1)时,缓蚀率可达到86.09%。赖氨酸席夫碱分子在Q235钢表面的吸附既有物理吸附又有化学吸附。通过同时降低阳极金属溶解和阴极析氢反应,从而降低腐蚀反应速率,由此判断其为混合型缓蚀剂。通过该实验,可激发学生的科研能力,拓展学生的实验思路。Aninnovative experiment was designed about solvent-free synthesis and corrosion inhibition of environmentally friendly lysine Schiff base.Lysine Schiff base was synthesized from lysine and vanillin by solvent-free method.The struc⁃ture of lysine Schiff base was characterized by Fourier transform infrared spectrometer(FTIR).The corrosion inhibition ef⁃fect of lysine Schiff base corrosion inhibitor on Q235 steel at 30℃in 0.5 mol·L^(-1) H_(2)SO_(4) solution was studied by weight loss method and electrochemical method.The corrosion inhibition mechanism was discussed,and the adsorption thermodynamic study of lysine Schiff base was carried out.The experimental results show that the corrosion inhibition efficiency of lysine Schiff base is higher at the same dosage compared with lysine.When the addition of lysine Schiff base was 500 mol·L^(-1),the corrosion inhibition efficiency reached 86.09%.The adsorption of lysine Schiff base molecules on the surface of Q235 steel has both physical adsorption and chemical adsorption,which can reduce the corrosion reaction rate by reducing the anode metal dissolution and cathode hydrogen evolution reaction.It is a mixed corrosion inhibitor.Through this experiment,stu⁃dents′scientific research ability can be stimulated and their experimental ideas can be expanded.

关 键 词：缓蚀剂 赖氨酸席夫碱 失重法 电化学方法 

分 类 号：TG174.42[金属学及工艺—金属表面处理] O641.4[金属学及工艺—金属学]