蛋氨酸与羧甲基纤维素钠复配缓蚀剂在盐酸介质中对2024铝合金的协同缓蚀作用  

Synergistic Inhibition of Methionine and Carboxymethylcellulose Sodium for 2024 Aluminum in Hydrochloric Acid Solution

作　　者：文家新[1] 张欣[1] 刘云霞[1] 和志强 李应[1] WEN Jia- xin, ZHANG Xin, LIU Yun- xia, HE Zhi - qiang, LI Ying(School of Chemical ＆ Pharmaceutical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China)

机构地区：[1]重庆工业职业技术学院化学与制药工程学院,重庆401120

出　　处：《材料保护》2018年第9期49-53,共5页Materials Protection

基　　金：重庆工业职业技术学院科研项目(GZY201708-ZA);重庆市教委科学技术研究项目(KJ1603011)资助

摘　　要：为拓宽蛋氨酸复配缓蚀剂在金属腐蚀控制领域的应用,研究了蛋氨酸(Met)与羧甲基纤维素钠(CMC)在0.5 mol/L盐酸溶液中对2024铝合金的协同缓蚀效应,通过失重法研究了Met的缓蚀效率与其浓度的关系,采用失重法、极化曲线法和电化学阻抗谱法(EIS)研究了Met与CMC的协同缓蚀效应,并探讨了其对2024铝合金的缓蚀机理。结果表明:单一的Met在0.5 mol/L的盐酸溶液中对2024铝合金具有一定的缓蚀作用,但当Met与60mg/L CMC复配后缓蚀效率明显增加,可高达92.96%~97.58%,表现出良好的协同缓蚀效应;复合缓蚀剂的添加显著增大了腐蚀反应的表观活化能,有效抑制了腐蚀反应的进行,是一种以控制阴极析氢过程为主的混合型缓蚀剂。In order to expand the application of methionine compound corrosion inhibitor in the field of metal corrosion control, the synergistic corrosion inhibition effect of methionine（Met） and carboxymethylcellulose sodium（CMC） for 2024 aluminum in 0.5 mol/L HCl solution was studied through the weight loss method, polarization curves and electrical impedance spectroscopy （EIS）, and the corrosion inhibition mechanism of the synergistic corrosion inhibition effect was also discussed. Results showed that the Met had a certain corrosion inhibition effect for 2024 aluminum in 0.5 mol/L HCl solution. However, the inhibition efficiency was increased significantly, up to 92.96%-97.58% when Met was mixed with 60 mg/L CMC, showing a good synergistic effect of corrosion inhibition. The apparent activation energy of corrosion reaction was signifieantly increased by the addition of the compound inhibitor, which indicated that the process of corrosion reaction was effectively inhibited. Besides, it was a mix-type inhibitor, which had great restraint on cathodic hydrogen evolution.

关 键 词：蛋氨酸 羧甲基纤维素钠 缓蚀剂 2024铝合金 盐酸 协同效应 

分 类 号：TG174.42[金属学及工艺—金属表面处理]