Chitosan derivatives as promising green corrosion inhibitors for carbon steel in acidic environment: Inhibition performance and interfacial adsorption mechanism

被引:61
作者
Zhang, Q. H. [1 ,2 ]
Xu, N. [1 ]
Jiang, Z. N. [2 ]
Liu, H. F. [2 ,3 ]
Zhang, G. A. [2 ]
机构
[1] Anhui Polytech Univ, Sch Chem & Environm Engn, Anhui Prov Key Lab Funct Coordinated Complexes Ma, Wuhu 241000, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ,Hubei Key Lab Mat Chem & Serv Failure, Wuhan 430074, Peoples R China
[3] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 410074, Peoples R China
基金
中国国家自然科学基金;
关键词
Carbon steel; Green corrosion inhibitors; Chitosan derivatives; Electrochemical tests; Theoretical calculations; MILD-STEEL; NACL SOLUTION; GUAR GUM; CHLORIDE; PROTECTION; CELLULOSE; SURFACE; COPPER; XPS;
D O I
10.1016/j.jcis.2023.02.141
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Among the biodegradable polysaccharide, chitosan is widely present in the cell membranes of bacteria and algae and in the cell walls of higher plants. As a promising biopolymer, chitosan has great potential as eco-friendly corrosion inhibitor. Herein, two synthetic chitosan derivatives (N-phenylthiourea chitosan (CS-PT), N-phenyl-O-benzylthiourea chitosan (CS-PT-Bn)) were investigated as high-efficient acidic corrosion inhibitors to deal with the corrosion issue of carbon steel. The anti-corrosion property of the chitosan derivatives was explored by electrochemical tests, surface characterization and theoretical calculations. The experimental results indicate that both CS-PT and CS-PT-Bn present high-efficient inhibition performance with the inhibition efficiency of 98.4% and 98.5% at the concentration of 100 mg/L, respectively. Their adsorption mechanism at steel/solution interface is revealed by quantum chemical calculations, molecular dynamics (MD) and GFN-xTB calculations. It is found that CS-PT and CS-PT-Bn adsorb at the steel/solution interface by forming Fe-N and Fe-S bonds. Compared to CS-PT molecule, the introduction of benzyl group endows CS-PT-Bn molecule with stronger electrostatic effect and hydrophobicity, which favors the interfacial adsorption of CS-PT-Bn molecule on carbon steel surface. (c) 2023 Elsevier Inc. All rights reserved.
引用
收藏
页码:1052 / 1067
页数:16
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