Browsing by Author "Oyinna, B. C."

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    Corrosion inhibition of mild steel using plant extract (Vernonia Amygdalina (Bitter Leaf) and Azadirachta Indica (Dogoyaro)
    (U. P., 2012-02) Obiukwu, O. O.; Ignatius, O.; Oyinna, B. C.; Osuagwu, C. M.; Ogbuo, T. E.
    The corrosion inhibition of mild steel, coated with Vernonia amygdalina (Bitter Leaf) and Azadirachta indica (Dogoyaro) and immersed in hydrochloric acid (HCl) solution, tetraoxosulphate (IV) acid (H2SO4) solution, trioxonitrate (v) acid (HNO3) solution, distilled water, sea water and exposed to the atmosphere, was investigated in a laboratory scale experiment. The concentration of the acids used was 2.5M for each acid. The weight loss method, corrosion rate and inhibitive efficiency was used to carry out the experiment, at intervals of four (4) hours for twenty-four (24) hours for the acid test and seven (7) days interval for a period of fourty-two (42) days for the other test with sea water, distilled water and exposure to the atmosphere and the results were obtained and recorded accordingly. The results obtained showed that the Vernonia amygdalina (Bitter leaf) and Azadirachta indica have inhibitive efficiencies of 91% and 69% respectively in acid solutions . Azadirachta indica proved to be a better inhibitor at the early stage of immersion in HCl with efficiency of 43% and was the best inhibitor in H2SO4 with an efficiency of 91% at the early stage of immersion in the acid. The test on HNO3 was not successful due to corrosive nature of the acid even when the concentration was reduced.