Studies on corrosion-inhibiting performance of antithyroid drugs on mild steel in hydrochloric acid

被引:10
|
作者
Hoseinpoor, M. [1 ]
Davoodi, A. [2 ]
机构
[1] Ferdowsi Univ Mashhad, Mat & Met Engn Dept, Fac Engn, Mashhad 917751111, Iran
[2] Hakim Sabzevari Univ, Mat & Polymer Engn Dept, Sabzevar, Iran
关键词
Mild steel; Acid inhibition; Antithyroid drugs; Polarisation; Quantum chemical; BENZOTRIAZOLE; DERIVATIVES;
D O I
10.1007/s11164-013-1527-z
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The inhibitive performance of methimazole (MMI) and propylthiouracil (PTU), two antithyroid drugs on corrosion behaviour of mild steel in 0.1 M HCl solution, was investigated by means of electrochemical techniques and quantum chemical analysis. The increase in concentration shows a positive effect on inhibition efficiency while increase in temperature increases and decreases the efficiency of MMI and PTU, respectively. Inhibitor molecules directly adsorb at the surface on the basis of donor-acceptor interactions between the pi-electrons, sulfur and oxygen atoms and the vacant d-orbitals of iron atoms. According to the thermodynamic parameters, MMI and PTU adsorb chemically and physically, respectively. Adsorption of them on metal surfaces follows the Langmuir adsorption isotherm.
引用
收藏
页码:4255 / 4272
页数:18
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