Kini, Achutha U and Shetty, Prakash and Shetty, Divakara S and Isloor, Arun M (2010) Corrosion Inhibition of 6061 Al alloy–15 vol% SiC(p) Composite in 0.1 M Hydrochloric Acid. Journal of the Chilean Chemical Society, 55 (1). pp. 56-60. ISSN 0717-9707

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Abstract

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 corrosive medium to reduce the rate of acidic attack on the composite. The organic compounds adsorb on the metal surface forming a barrier between the metal and the corrosive environment. Some structural features of the organic compounds help them to do so. These include the presence of oxygen, nitrogen or sulphur atoms as well as the presence of double bonds. 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 0.1 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 efficient cathodic inhibitor with 91.6 % of inhibition efficiency over the range of temperature studied The adsorption of the compound on the composite surface is found to obey Langmuir adsorption isotherm. Inhibition is governed by mixed adsorption mechanism with predominant physical adsorption type. Thermodynamic parameters for the adsorption processes were determined from the experimental data

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