Corrosion Inhibition of Mild Steel in Hydrochloric Acid by Tannins from Rhizophora Racemosa

Oki, Makanjuola and Ebitei, C. and Alaka, C. and Oki, T.K. (2011) Corrosion Inhibition of Mild Steel in Hydrochloric Acid by Tannins from Rhizophora Racemosa. Materials Sciences and Applications, 2. pp. 592-595.

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Abstract

Studies on the corrosion behaviour of mild steel electrodes in inhibited hydrochloric acid are described. Conventional weight loss measurements show that a maximum concentration of 140 ppm of tannin from Rhizophora racemosa is required to achieve 72% corrosion inhibition. Similar concentration of tannin: H3PO4 in ratio 1:1 gave 61% inhibition efficiency, whereas efficiency obtained for phosphoric acid as inhibitor in the same environment was 55%. Corrosion rates obtained over six hours of exposure in 1 M HCl solution at inhibitor concentrations of 140 ppm are 2 mA/cm2 , 2.4 mA/cm2 , 2.6 mA/cm2 and 6 mA/cm2 for tannin, tannin/H3PO4 and H3PO4-inhibited and uninhibited specimens respectively. Natural atmospheric exposure studies revealed that specimens treated in H3PO4 resisted corrosion for three weeks, while tannin treated specimens suffered corrosion attack after one week of exposure tests. Keywords: Inhibitor, Tannins, Corrosion Rate, Rhizophora Racemosa, Phosphoric Acid

Item Type:	Article
Subjects:	T Technology > TJ Mechanical engineering and machinery
Depositing User:	Mr DIGITAL CONTENT CREATOR LMU
Date Deposited:	24 Oct 2019 12:39
Last Modified:	24 Oct 2019 12:39
URI:	https://eprints.lmu.edu.ng/id/eprint/2619

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