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ZG/ZH Mannich bases (acid corrosion inhibitors) were synthesized with benzaldehyde, 2-aminothiazole, acetophenone/cyclohexanone as raw materials, and selecting the appropriate proportion of reaction time, temperature and ratio of raw materials.The corrosion inhibition performance of two kinds of Mannich bases on N80 steel was investigated by means of mass loss method and electrochemical technique. The result of mass loss method showed that two kinds of inhibitors both had excellent effect on N80 steel in 15% hydro-chloric acid solution. Electrochemical technique showed that both ZG and ZH were a mainly anodic-controlling composite corrosion inhibitor, and their corrosion inhibition effect was further confirmed by AC impedance technique. The adsorption behavior between inhibitiors and the steel surface both abides by the Langmuir isotherm model.

Study on the Corrosion Inhibition Characteristic of ZH and ZG Mannich Base Inhibitors