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International Journal of Corrosion
Volume 2015, Article ID 548031, 12 pages
Research Article

An Investigation of a Combined Thiourea and Hexamethylenetetramine as Inhibitors for Corrosion of N80 in 15% HCl Solution: Electrochemical Experiments and Quantum Chemical Calculation

1School of Chemical Engineering, Northwest University, No. 229 North Road of Taibai, Xi’an, Shaanxi 710069, China
2Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Xi’an, Shaanxi 710069, China

Received 5 March 2015; Accepted 28 April 2015

Academic Editor: Ksenija Babic

Copyright © 2015 Jun Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The inhibition mechanism of thiourea (TU) and hexamethylenetetramine (HMTA) mixed in 15% HCl solution on N80 surface was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy measurements, and surface morphology analysis. Quantum chemical calculations and molecular dynamics simulations were performed to study the properties of TU and HMTA. The results showed that the inhibitors can form strong bonds and stable films on the surface, which inhibits the cathodic and anodic reactions in HCl solution and reduces the diffusion coefficients of corrosive particles.