Corrosion Inhibition of 6061 Al alloy– 15 vol% SiC(p) Composite in 0.5 M Hydrochloric Acid Solution

Kini, Achutha U and Shetty, Prakash and Shetty, Divakara S and Isloor, Arun M (2012) Corrosion Inhibition of 6061 Al alloy– 15 vol% SiC(p) Composite in 0.5 M Hydrochloric Acid Solution. International Journal of Biological, Ecological and Environmental Sciences (IJBEES), 1 (3). pp. 77-81. ISSN 2277 – 4394

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Aluminium, its alloys and composites represent an important category of materials due to their high technological value and wide range of applications, especially in aerospace industry, automobile industry and military applications. The use of these materials in light weight applications is widespread and these usages expose them to environments that could be acidic or alkaline. Corrosion inhibitors are chemical compounds (organic or inorganic) added to the medium to reduce the rate of acidic attack on the metal/composite. The organic compounds adsorb on the metal surface forming a barrier between the metal and the corrosive medium. Some structural features such as multiple bonds, presence of hetero atoms of nitrogen, oxygen and/or sulphur help them to do so. In the present work, inhibition efficiency of Propanoyl(1E)-N-(2-acetylphenyl)-2-oxopropanehydrazonoate (PAOH) on the corrosion of 6061 Al alloy–15 vol. % SiC(p) composite in 0.5 M hydrochloric acid medium in the 30-60 ⁰C temperature range using Potentiostatic Polarization (Tafel extrapolation and Linear Polarization) techniques. The results obtained indicate that PAOH is an cathodic inhibitor with 96.5 % inhibition efficiency over the range of temperature studied. The adsorption of the inhibitor on the composite surface is found to obey both Temkins’ and Langmuir adsorption isotherms. Inhibition is governed by mixed adsorption mechanism with predominantly physical adsorption type. Thermodynamic parameters for the adsorption processes were determined from the experimental data.

Item Type: Article
Uncontrolled Keywords: Potentio-static polarization, Adsorption Isotherms, Cathodic Inhibitor, Mixed Adsorption mechanism
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Engineering > MIT Manipal > Printing and Media
Depositing User: Dr. Rekha D. Pai
Date Deposited: 20 Feb 2013 09:51
Last Modified: 20 Feb 2013 09:51

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