Chitosan as a green inhibitor for mild steel corrosion: Thermodynamic and electrochemical evaluations

被引：38
作者：
Rabizadeh, Taher [1 ]
Asl, Shahin Khameneh [1 ]
机构：
[1] Univ Tabriz, Dept Mat Engn, Fac Mech Engn, Tabriz 5166616471, Iran
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2019年 / 70卷 / 04期
关键词：
adsorption; AFM; chitosan; corrosion; EIS; inhibitor; CARBON-STEEL; ACID; DERIVATIVES; PROTECTION; ADSORPTION; BENZOTRIAZOLE; PERFORMANCE; ALUMINUM; COATINGS; PYRIDINE;
D O I：
10.1002/maco.201810501
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this research, the effects of chitosan on the corrosion behavior of mild steel in 0.1 M hydrochloric acid was investigated by different approaches. According to weight loss measurements, increasing the concentration of chitosan from 0.3 to 1.8 mM, significantly reduced the corrosion rate of mild steel, for example, from 95.5 +/- 5 to 7.5 +/- 5 mpy at 298 K. The thermodynamic calculations indicate an increase in the corrosion activation energy and the enthalpy of activation when 1.8 mM chitosan was added to the aggressive solution. The electrochemical polarization technique revealed a decrease in corrosion current density which is compatible with the observed increase in the charge transfer resistance measured by electrochemical impedance spectroscopy. The EDS spectra confirmed the adsorption of chitosan on mild steel. Analyzing the surface topography of the coupons by atomic force microscopy showed a remarkable decrease in the corrosion rate of the specimens in the presence of chitosan.
引用
收藏
页码：738 / 748
页数：11
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