Inhibition by tween-85 of the corrosion of cold rolled steel in 1.0 M hydrochloric acid solution
- Resource Type
- Original Paper
- Authors
- Li, Xiang-Hong; Deng, Shu-Duan; Fu, Hui; Mu, Guan-Nan
- Source
- Journal of Applied Electrochemistry. July 2009 39(7):1125-1135
- Subject
- Tween-85
Corrosion inhibitor
Hydrochloric acid
Cold rolled steel
FTIR
XPS
AFM
- Language
- English
- ISSN
- 0021-891X
1572-8838
The inhibition effect of tween-85 on the corrosion of cold rolled steel (CRS) in 1.0 M hydrochloric acid (HCl) was studied by weight loss and potentiodynamic polarization methods. The results show that tween-85 is a good inhibitor in 1.0 M HCl and its maximum inhibition efficiency (IE) is 92% at very low concentration. Its adsorption obeys the Langmuir adsorption isotherm equation. The thermodynamic parameters of adsorption enthalpy (ΔH0), adsorption free energy (ΔG0) and adsorption entropy (ΔS0) were calculated and discussed. Polarization curves show that tween-85 acts as a mixed-type inhibitor in hydrochloric acid. IE values obtained from weight loss and polarization are consistent. The adsorbed film on a CRS surface containing an optimum dose of tween-85 was investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM). An inhibitive mechanism is proposed from the viewpoint of adsorption theory.