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Adsorption behaviour of film-forming amine on pre-oxidized carbon steel surface
Lin Genxian,Sun Yun,Liu Canshuai,Fang Jun,Song Lijun,Liu Bin 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
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
Effect of octadecylamine concentration on adsorption on carbon steel surface
Canshuai Liu,Genxian Lin,Yun Sun,Jundong Lu,Jun Fang,Chun Yu,Lisheng Chi,Ke Sun 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.10
Octadecylamine is an effective film-forming amine that protects carbon steel from corrosion. In the present study, the effect of octadecylamine concentration on adsorption on a carbon steel surface was investigated in anaerobic alkaline solution by using SEM/EDS, TEM and the Materials Studio simulation techniques. TEM morphology observation and EDS elemental detection determine the thicknesses of octadecylamine film on a carbon steel surface, which are confirmed by the in-situ electrochemical impedance spectroscopy measurement and resistance calculation. The Materials Studio simulation reveals the number of octadecylamine film layers at different concentrations. Results obtained in this study indicate that adsorption of octadecylamine film on carbon steel proceeds with the multi-layer adsorption mechanism.