Corrosion inhibition of iron by amphoteric surfactants in hydrochloric acid solutions
- 148 Downloads
In the present work the corrosion inhibition of iron in 2 M HCl solution by amphoteric surfactants was studied. The techniques of measurements were (i) weight loss, (ii) linear polarization and (iii) electrochemical impedance spectroscopy. The investigated surfactants have the structure: where, R = –C14H29(I), –C15H31(II), –C16H33(III), –C17H35(IV), –C18H37(V). These surfactants have a high inhibitory effect on the corrosion of iron in HCl solution. The inhibiting effect of these surfactants may take place through the blocking effect resulting from their adsorption on the metallic surface and hydrophobic effect. The inhibition efficiency increases according to the order: I < II < III < IV < V. This is due to the increase of the length of the alkyl group (–R) in the surfactants. The adsorption of these surfactants via their adsorption centers on the metallic surface obeyed the Frumkin adsorption isotherm. The presence of these surfactants in the corrosive solution increases the activation energy of the corrosion process with that order of inhibition efficiency.
KeywordsSurfactant Surfactant Concentration Inhibition Efficiency Corrosion Inhibitor Charge Transfer Resistance
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
- 1.Pillali KC, Narayan R (1985) Corros Sci 23:151Google Scholar
- 10.Clubley BG (1990) Chemical inhibitors for corrosion control. Royal Society of Chemistry, CambridgeGoogle Scholar
- 11.Uhlig HH, Revie RW (1985) Corrosion and corrosion control. John Wiley & Sons, New York, NY, p 263Google Scholar
- 15.Tsuru T, Haruyama S, Gijutsu B (1978) J Jpn Soc Corros Engn 27:573Google Scholar
- 19.Perbani G, Rocchini G (1983) International conference on corrosion inhibitors. Dallas, May 1983, no 29Google Scholar
© Springer Science+Business Media, LLC 2007