Thermodynamic, chemical and electrochemical investigations of 2-mercapto benzimidazole as corrosion inhibitor for mild steel in hydrochloric acid solutions

Loại tài liệu:

Article

Tác giả:

Benabdellah, M.

Đề mục:

Arabian Journal of Chemistry

Nhà xuất bản:

Elsevier Ltd.

Ngày xuất bản:

October 2010

Định dạng:

pdf

Nguồn gốc:

Arabian Journal of Chemistry, Volume 4, Issue 1, January 2011, Pages 17-24

Ngôn ngữ:

eng

Lượt xem:

Lượt tải:

Nội dung

The inhibiting action of 2-mercapto benzimidazole (2MBI) on mild steel in 1.0 M hydrochloric acid has been investigated at 308 K using weight loss measurements and electrochemical techniques (impedance spectroscopy and potentiodynamic polarisation). Inhibition efficiency increases with 2MBI concentration to attain 98% at 10−3 M. Polarisation curves indicate that 2MBI acts as a mixed-type inhibitor. Inhibition efficiency values obtained from various methods were in good agreement. EIS measurements showed an increase of the transfer resistance with the inhibitor concentration. The temperature effect on the corrosion behaviour of steel in 1.0 M HCl without and with the 2MBI at various concentrations was studied in the temperature range from 308 to 353 K. Thermodynamic parameters such as heat of adsorption $(Δ H_{ads}^{\circ})$ , entropy of adsorption $(Δ S_{ads}^{\circ})$ and adsorption free energy $(Δ G_{ads}^{\circ})$ have been calculated. Kinetic parameters for the corrosion reaction at different concentrations of 2MBI were determined. Adsorption of 2MBI on the mild steel surface in 1.0 M HCl follows the Langmuir isotherm model.

Tập tin đính kèm

Loại file Tên file Dung lượng Chi tiết
201101AJC17-24.pdf 698110 Kb Xem Tải

Thermodynamic, chemical and electrochemical investigations of 2-mercapto benzimidazole as corrosion inhibitor for mild steel in hydrochloric acid solutions

THƯ VIỆN ĐẠI HỌC KHOA HỌC HUẾ