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Ekere, Isaac
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article
Adsorptive performance mechanism of the DNA of Calf Thymus Gland (CTGDNA) on 3CR12 stainless steel as corrosion inhibitor in acidic medium
Abstract
<p>Corrosion inhibitor has been successfully used for the protection of 3CR12 stainless steel surface against corrosion in 1–2.5 M HCl. The performance of this inhibitor was correlated to the chemical composition and microscopic structures in accordance with the adsorption on the metal surface. Deoxyribonucleic acid (DNA) was extracted from the thymus gland of a calf, a component of the immune system of mammals. The study investigated the use of DNA extracted from calf thymus gland as a protective coat for 3CR12 stainless steel in the presence of a hydrochloric (HCl) medium. The mechanism of the potential inhibitor was understudied at different conditions of temperature and concentration in order to be able to explain the influence of the inhibitor on the metal. The highest CTG<sub>DNA</sub> inhibition efficiency was attained at 10 °C and at 20 mg/L. The micrographs revealed by scanning electron microscopy show that bio-macromolecules of CTG<sub>DNA</sub> were adsorbed on stainless steel surfaces. Nonetheless, the best micrograph result was achieved at 10 °C. The study of the Tafel polarization demonstrated that CTG<sub>DNA</sub> inhibitors at different concentration represented some mixed-type inhibitors. An inhibition mechanism was proposed which was confirmed by X-ray powder diffraction analysis. The results indicated that the corrosion inhibition efficiency increased with increase in HCl concentration.</p>