Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 104, Issue 1, Pages 74-82Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2007.02.073
Keywords
steel; corrosion; hexamethylenetetramine; electrochemical measurement
Categories
Ask authors/readers for more resources
The efficiency of hexamethylenetetramine (HMTA), as corrosion inhibitors for steel in de-aerated 0.3M HCl, 0.1M H2SO4 and 0.1M H2SO4 + 1.0 x 10(-3) M HCl solutions have been determined by electrochemical studies. It was found that the HMTA acts a good corrosion inhibitor for steel corrosion in acids solutions. Increase in inhibition efficiency with the increase of concentrations of HMTA shows that inhibition actions are due to adsorption on the steel surface and adsorption follows the Langmuir isotherm. From the adsorption isotherms values of equilibrium constant (K-ads) values of free energies of adsorption (Delta G(ads)degrees), were calculated. The effect of temperature on the corrosion behaviour in the presence of 1.0 x 10(-1) M inhibitors was studied in the temperature range of 293-323 K. The inhibition efficiency of HMTA increased with increasing temperature up to 323 K. Activation energies (E-a*) were calculated from the obtained corrosion rates at different temperatures. Results obtained from both potentiodynamic polarisation and AC impedance measurements reveal that the compound is an effective inhibitor for the corrosion of steel and behave better in HCl than in H2SO4. Surface analyses were also carried out to establish the mechanism of corrosion inhibition of steel in acidic media. (c) 2007 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available