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IJCT Vol.17(2) [March 2010] >


Title: Corrosion inhibition of Al-Mg alloy by gentisic acid
Authors: Vrsalović, L
Kliškić, M
Gudić, S
Smoljko, I
Keywords: Al-Mg alloy
Corrosion inhibition
Gentisic acid
Rotating disc electrode
Adsorption
Activation energy
Issue Date: Mar-2010
Publisher: CSIR
Abstract: Gentisic acid was studied for possible use as an Al-2.5Mg alloy corrosion inhibitor in a 0.5 mol dm-3 NaCl solution. Investigations were performed on a rotating disc electrode in a quiescent solution at different electrode rotation rates and electrolyte temperatures. The results indicate that, the addition of gentisic acid inhibits corrosion of Al-2.5Mg alloy, and the inhibition efficiency increases with increasing inhibitor concentration but decreases with increasing electrode rotation rate and electrolyte temperature. The investigated compound acts as a cathodic-type inhibitor and the inhibition is ascribed to the adsorption of the inhibitor onto the electrode surface. The adsorptive behaviour of gentisic acid follows the Freundlich adsorption isotherm.
Page(s): 89-94
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.17(2) [March 2010]

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