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New azonitrile derivatives as corrosion inhibitors for copper in nitric acid solution

机译：新的氮腈衍生物可作为硝酸溶液中铜的腐蚀抑制剂

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The inhibitive effect of new synthesized azonitriles, namely 3-phenyl azo-2-amino-1,1,3-tricyano propene, 3-p-tolyl azo-2-amino-1,1,3-tricyano propene, 3-p-anisyl azo-2-amino-1,1,3-tricyano propene, 3-p-nitro phenyl azo-2 amino-1,1,3-tricyano propene, and 3-p-phenyl carboxylic azo-2-amino-1,1,3-tricyano propene on the corrosion of copper in nitric acid solution was investigated using chemical and electrochemical methods. The inhibition efficiency was found to increase with inhibitor concentration and decreased with rise in solution temperature. Various thermodynamic parameters were calculated and discussed in order to elaborate the mechanism of corrosion inhibition. Polarization measurements revealed that the studied azonitriles acted as mixed inhibitors. The results revealed that these compounds were adsorbed onto the copper surface and the adsorption obeyed the Temkin adsorption isotherm. The quantum chemical calculations were in good agreement with the experimental results.
机译：新合成的偶氮腈，即3-苯基偶氮-2-氨基-1,1,3-三氰基丙烯，3-对甲苯基偶氮-2-氨基-1,1,3-三氰基丙烯，3-p的抑制作用-茴香基偶氮-2-氨基-1,1,3-三氰基丙烯，3-对硝基苯基偶氮-2氨基-1,1,3-三氰基丙烯和3-对苯基羧酸偶氮-2-氨基-用化学和电化学方法研究了1,1,3-三氰基丙烯对硝酸溶液中铜的腐蚀。发现抑制效率随抑制剂浓度而增加，随溶液温度升高而降低。计算和讨论了各种热力学参数，以阐明缓蚀机理。极化测量结果表明，所研究的腈类化合物起着混合抑制剂的作用。结果表明，这些化合物被吸附到铜表面上，并且吸附遵循Temkin吸附等温线。量子化学计算与实验结果吻合良好。

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