期刊
COATINGS
卷 9, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/coatings9100675
关键词
cyclopolymerization; water-soluble polymers; zwitterionic polymers; corrosion inhibitors; potentiodynamic polarization; adsorption isotherm; acidic medium; mild steel
资金
- Deanship of Scientific Research (DSR), King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia [IN131047]
The zwitterionic monomers, N,N'-diallylamino propanephosphonate and amino acid residual N,N'-diallyl-l-methionine hydrochloride were synthesized, with excellent yields. These monomers were utilized in the preparation of zwitterionic homo and co-cyclopolymers 5-7 in aqueous solution using 2,2'-azobis (2-methylpropionamidine) dihydrochloride as an initiator. The polymers were characterized by FT-IR, NMR, and TGA. The performance of these synthesized polymers on mild steel in acidic solution was investigated by gravimetric method, Tafel extrapolation, linear polarization resistance, and electrochemical impedance spectroscopy. At 313 K, the maximum inhibition efficiencies of corrosion inhibitors 5-7 at 4.50 x 10(-4) mol L-1 were found to be 85.2%, 83.3%, and 99.5%, respectively. The inhibition efficiencies obtained from gravimetric weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements were in good agreement. Different adsorption isotherms were also explored to find the best fit, and found to obey Langmuir adsorption isotherm. The thermodynamic parameters, such as activation energy (E-a), standard enthalpy of activation (Delta H*), standard entropy of activation (Delta S*), adsorption-desorption equilibrium constant (K-ads), and standard free energy of adsorption (Delta G(ads)(o)), were determined. Electrochemical data indicated that the zwitterionic copolymer 7 acts as a mixed type inhibitor under the influence of anodic control. The surface morphology of mild steel corrosion was evaluated without and with corrosion inhibitors by AFM, SEM-EDX, and XPS, which confirmed the adsorption of inhibitor molecules on the metal surface.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据