Evaluation of Shazab extract as eco-friendly green corrosion inhibitor for 420 stainless steel in hydrochloric acid

被引：8
|
作者：
Ganash, Aisha A. [1 ]
Baali, Asma A. [1 ]
Alajlani, Layla A. [1 ]
Alhrbi, Rana F. [1 ]
Sukkar, Elham K. [1 ]
机构：
[1] King Abdulaziz Univ, Fac Sci, Chem Dept, Jeddah, Saudi Arabia
来源：
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 09期
关键词：
420 stainless steel; Shazab extract; pitting corrosion; isotherm models; UV-vis; FTIR; AL-CU ALLOY; MILD-STEEL; AQUEOUS EXTRACT; IMPEDANCE MEASUREMENTS; LEAVES EXTRACT; ALUMINUM; DERIVATIVES; L; PROTECTION; BEHAVIOR;
D O I：
10.1088/2053-1591/ab2de9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of dried Shazab leaf extract (DSLE) as a green, eco-friendly corrosion inhibitor for 420 stainless steel (420 SS) in 0.5 M HCl was evaluated using electrochemical impedance spectroscopy (EIS) and potentiodynamic Tafel polarisation (PTP). Four types of isotherm models were applied to calculate the equilibrium adsorption constant (K-ads), and based on the value of the correlation coefficient (R-2), the Langmuir isotherm was found to be the best in this study. Moreover, based on the different thermodynamic parameters such as G(ads), H-ads, and Ea, the adsorption of DSLE on 420 SS was considered to be a physisorption process, and the adsorption was proved using FTIR and UV-vis spectroscopy. The degree of pitting that appeared on the metal surface was investigated in different concentrations of HCl and examined using microscopic photographs. Finally, the inhibition mechanism was studied.
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页数：13
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