Adsorption behaviour of film-forming amine on pre-oxidized carbon steel surface
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The maintenance of condenser main pipe is the key to achieve film-forming amine maintenance effectiveness. In this work, oxygen content, pH and temperature of the solution were controlled to simulatethe condition of condenser main pipe, and magnetite coated carbon steel sample was prepared by preoxidization. CAM was used to characterize the hydrophobicity of film formed samples. Hydrophobic filmwas formed on pre-oxidized carbon steel samples when octadecylamine concentration reaches 20 mg/kg. SEM, EDS, EIS, and PD were used to characterize the influence of octadecylamine concentration onmaintenance effectiveness. It was found that the maintenance effectiveness was enhanced and thecorrosion rate was suppressed with the increase of octadecylamine concentration. FIB and TEM wereused to detect the adsorbed octadecylamine film thickness founding that octadecylamine adsorbed ontothe surface of pre-oxidized carbon steel by multi-layer adsorption mechanism
Abstract
The maintenance of condenser main pipe is the key to achieve film-forming amine maintenance effectiveness. In this work, oxygen content, pH and temperature of the solution were controlled to simulatethe condition of condenser main pipe, and magnetite coated carbon steel sample was prepared by preoxidization. CAM was used to characterize the hydrophobicity of film formed samples. Hydrophobic filmwas formed on pre-oxidized carbon steel samples when octadecylamine concentration reaches 20 mg/kg. SEM, EDS, EIS, and PD were used to characterize the influence of octadecylamine concentration onmaintenance effectiveness. It was found that the maintenance effectiveness was enhanced and thecorrosion rate was suppressed with the increase of octadecylamine concentration. FIB and TEM wereused to detect the adsorbed octadecylamine film thickness founding that octadecylamine adsorbed ontothe surface of pre-oxidized carbon steel by multi-layer adsorption mechanism
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