Pyridine as anti-corrosion additive for acid Corrosion of Copper

O. O. Adeyemi

Abstract


Abstract
The electrochemical behaviour of commercial copper in 1N 𝐻 τ€€€τ€€τ€€‚ was studied in the presence of pyridine using immersion test method, potentiostatic polarization and temperature kinetic techniques. Sudies were carried out in acid solutions containing 10-5M, 10-3M and 10-M pyridine solutions at τ€€ƒτ€€„τ€€…τ€€†, τ€€‡τ€€„τ€€…τ€€†, τ€€ˆτ€€„τ€€…τ€€† and τ€€‰τ€€„τ€€…τ€€† respectively. The effect of inhibitor concentration, exposure time, corrosion rate and surface coverage on inhibition efficiency was evaluated. The corrosion rate and surface coverage varied with inhibitor concentration. Inhibition efficiencies decreased with temperature riseΒ Β  from 46-80 % at 30τ€€† and to as low as from 22-47 % at 60τ€€†. Material suffered general corrosion. The inhibitor obeyed Langmiur adsorption isotherm and inhibitor molecules are adsoarbed through ion-pair interaction between the pyridinium ions and the surface charge on the metal.


Keywords: Copper, adsorption, thermodynamics, pyridine, inhibition efficiency


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Chemical Society of Nigeria