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1 mol/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(G(a)dsθ=-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.
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