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采用失重法与电化学方法研究了咪唑和2-苯基-2咪唑啉对Cu在5%H_2SO_4水溶液中的缓蚀性能、吸附行为及缓蚀机理.结果表明,2种化合物对Cu均具有显著的缓蚀作用,且2-苯基2-咪唑啉的缓蚀效率大于咪唑.同时,分别采用腐蚀反应中的活化能E_a,吸附过程中的Gibbs自由能△G_m和吸附焓△H_m判断了2种化合物在Cu表面上的吸附特性.结果表明,咪唑和2苯基-2咪唑啉在Cu表面上的吸附过程为放热过程,均为单层化学吸附,服从Langmuir吸附等温式.此外,研究了咪唑和2-苯基-2-咪唑啉分子在Cu表面形成吸附层结构的差异,分析其对Cu的缓蚀机理.
The corrosion inhibition behavior, adsorption behavior and corrosion inhibition mechanism of imidazole and 2-phenyl-2-imidazoline to Cu in 5% H 2 SO 4 aqueous solution were studied by weight loss and electrochemical methods. The results showed that the two compounds had significant effects on Cu , And the inhibition efficiency of 2-phenyl 2-imidazoline is higher than that of imidazole.At the same time, the activation energy E_a in the corrosion reaction, the Gibbs free energy △ G_m and the adsorption enthalpy △ H_m in the adsorption process were respectively used to judge 2 The results showed that the adsorption processes of imidazole and 2-phenyl-2-imidazoline on the Cu surface were exothermic processes, all of which were single-layer chemisorption, which obey the Langmuir adsorption isotherm.In addition, The differences of the structure of the adsorbed layers on the Cu surface between the imidazole and 2-phenyl-2-imidazoline molecules were analyzed, and their inhibition mechanisms on Cu were also analyzed.