Electrochemical and gravimetric measurements of inhibition of aluminum corrosion by poly (methacrylic acid) in H2SO4 solution and synergistic effect of iodide ions

被引：48
作者：
Solomon, Moses M. [1 ]
Umoren, Saviour A. [2 ]
机构：
[1] Univ Uyo, Dept Chem, Corros Protect & Mat Res Lab, Fac Sci, Uyo, Nigeria
[2] King Fahd Univ Petr & Minerals, Res Inst, Ctr Res Excellence Corros, Dhahran 31261, Saudi Arabia
来源：
MEASUREMENT | 2015年 / 76卷
关键词：
Aluminum; Electrochemical impedance spectroscopy; Corrosion; Poly (methacrylic acid); Scanning electron microscopy; Synergism; MILD-STEEL CORROSION; LOW-CARBON STEEL; SULFURIC-ACID; ADSORPTION BEHAVIOR; POLYETHYLENE-GLYCOL; POTASSIUM-IODIDE; EXUDATE GUM; HALIDE-IONS; EXTRACT;
D O I：
10.1016/j.measurement.2015.08.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion inhibition of Al in 0.5 M H2SO4 solution by poly (methacrylic acid) (PMAA) alone and in combination with iodide ions was studied at 303-333 K using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and water contact angle measurements techniques. Results obtained show that PMAA moderately inhibited the dissolution of Al in the corrosive medium. Addition of Iodide ions synergistically upgrades the inhibition efficiency of PMAA to a maximum value of 82.6%. From polarization results, PMAA and PMAA + KI can be classified as mixed-type corrosion inhibitor. Thermodynamic parameters namely Gibbs free energy of adsorption, activation energy and enthalpy of activation revealed that the adsorption processes of PMAA and PMAA + KI are endothermic reactions mainly by a physisorption mechanism and followed El-Awady et al. thermodynamic-kinetic adsorption isotherm. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：104 / 116
页数：13
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