Evaluation of the Modified Extracted Lignin from Wheat Straw as Corrosion Inhibitors for Aluminum in Alkaline Solution

被引：27
作者：
El-Deeb, Mohamed M. [1 ,2 ]
Ads, Essam N. [1 ,3 ]
Humaidi, Jamal R. [1 ]
机构：
[1] Hail Univ, Fac Sci, Chem Dept, POB 2440, Hail 81451, Saudi Arabia
[2] Beni Suef Univ, Fac Sci, Chem Dept, Bani Suwayf 62511, Egypt
[3] Zagazig Univ, Fac Sci, Chem Dept, Zagazig, Egypt
来源：
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2018年 / 13卷 / 05期
关键词：
Modified Lignin; Aluminum; Adsorption; SEM-EDX; Alkaline Solution; HYDROCHLORIC-ACID SOLUTION; MILD-STEEL; PROTECTION; ANILINE; POLYMER; ALLOYS;
D O I：
10.20964/2018.05.49
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Extracted lignin from soda pulping of wheat straw agricultural waste is modified and characterized using spectroscopic and thermal analysis. Modified lignin compounds (LG-OH & LG-COOH) are investigated as corrosion inhibitors for aluminum in 1.0 M NaOH compared to their unmodified lignin (LG) using potentiodynamic polarization measurements and morphological characterization. Data show that the modified lignin compounds shift both the corrosion and the open circuit potentials of aluminum to more noble values as well as decrease its corrosion current density (I-corr) compared to its values in blank solution. The maximum inhibition efficiency is found to be in case of LG-COOH followed by LG-OH compared to LG. The higher inhibition efficiency of LG-COOH can be explained to its higher active adsorption sites compared to LG-OH and LG. Adsorption of modified lignin compounds on aluminum surface is confirmed using SEM-EDX analysis. The best fit adsorption isotherm is found to be Langmuir adsorption isotherm with physical nature. Thermodynamic parameters indicate endothermic nature of the corrosion process with higher ordered activated complexes in the presence of lignin compounds
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页码：4123 / 4138
页数：16
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