三嗪二硫醇化合物对铝合金的缓蚀性能  

Corrosion Inhibition of Triazine Dithiol Compound towards Aluminum Alloy

作　　者：樊瑞彬[1] 贾梦珂 徐久帅 王娇龙[1] 李亚辉[1] 王芳[1] 

机构地区：[1]西北农林科技大学理学院,陕西杨凌712100

出　　处：《材料科学与工程学报》2014年第4期577-581,591,共6页Journal of Materials Science and Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(QN2013085)

摘　　要：本研究采用失重法研究了三嗪二硫醇类化合物6-N,N-二丁基胺-1,3,5-三嗪-2,4-二硫醇单盐(DBN)在1mol/L盐酸溶液中对铝合金的缓蚀作用,探讨了缓蚀剂浓度、腐蚀时间和溶液温度对缓蚀效率的影响。结果表明,增大DBN浓度会提高其对铝合金的缓蚀效率,而延长腐蚀时间和升高腐蚀溶液温度都会降低其缓蚀效率。腐蚀反应动力学分析表明,添加DBN后腐蚀反应的表面活化能(Ea)增大,使腐蚀反应变得困难,从而起到缓蚀作用。同时,本研究发现DBN分子在金属表面的吸附行为符合Langmuir吸附等温线,吉布斯自由能计算(Gθads=-30.36kJ/mol)表明该吸附过程是自发的,且同时存在着物理吸附和化学吸附。扫描电子显微镜测定结果表明DBN能够有效地抑制铝合金在酸性介质中的腐蚀。W dibutylamino-1,3,5 eight loss test was employed in this study to investigate the inhibition property of 6-N, N- -triazine-2,4-dithiol monosodium （DBN） towards aluminum alloy in 1 mol/L hydrochloric acid solution. The effect of the DBN concentration, corrosion time and solution temperature on inhibition efficiency were discussed. The results show that the inhibition efficiency has been improved with the increasing of DBN concentration, and decreased with the prolongation of time and the rise of corrosion temperature. The analysis of corrosion reaction kinetics suggests that the activation energy （Ea） for corrosion reaction increases after DBN adding. Therefore, the corrosion reaction becomes difficult, which is thought able to protect the metal from corrosion. The study also indicates that the adsorption isotherm of DBN molecules on the aluminum alloy surface is consistent with the Langmuir adsorption model. The calculation of Gibbs free energy （G^θads, =- 30.36kJ/mol） shows that the adsorption is spontaneous, and both physical and chemical adsorption are existed. Scanning electron microscopy observation （SEM） shows that the corrosion of aluminum alloy can be effectively suppressed in acidic medium by DBN adding.

关 键 词：缓蚀剂 铝合金 失重法 反应动力学 Langmuir吸附模型 

分 类 号：TG174.42[金属学及工艺—金属表面处理]