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IJCT Vol.13(2) [March 2006] >


Title: Corrosion inhibition of brass by thiocarbamides
Authors: Taha, K K
Sheshadri, B S
Ahmed, M F
Muralidharan, V S
Keywords: Brass
Corrosion inhibition
Thiocarbamide
Perchloric acid
Issue Date: Mar-2006
Publisher: CSIR
IPC CodeC23F11/00
Abstract: Thiocarbamides namely thiocarbamide (TC), ethylenethiocarbamide (ETC) and thiobenzamide (TBA) have been used as corrosion inhibitors for (70/30) brass in 0.1 M HClO4. The inhibitor efficiency (% P) calculated using weight loss, Tafel line extrapolation, linear polarization and impedance methods has been found to be in the order: TBA > ETC > TC. Thiocarbamides adsorbed on the electrode surface inhibited the corrosion of brass. They adsorb following Flory-Huggins isotherms. The number of water molecules displaced was found to increase with molecular size. TC, ETC and TBA displaced 3, 4 and 10 molecules and caused a distortion at the metal solution interface. The inhibitor molecule may form complexes with the dissolved Cu and Zn ions. This may result in the formation of a film.
Page(s): 128-134
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.13(2) [March 2006]

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