Abstract
The effect of Azadirachta indica leaf (AIL) extract on the corrosion of copper in 1M HNO3 was investigated by weight loss technique. The result showed that the corrosion rate decreased in the presence of plant extract and inhibition efficiency increased with increasing the concentration of extract. The decreased corrosion rate was due to adsorption of plant extract which was discussed on the basis of Langmuir adsorption isotherm.
Highlights
OlofsAsztaedcihranciqhutae.inTdhicearelesauflt(AshILo)weexdtrathcat tonthtehecocrororrsoiosinonraotef cdoepcpreerasined1MinHtNheO3pwreassenincveesotfigpaltaendt extract and inhibition efficiency increased with increasing the concentration of extract
The inspection of these values shows that the weight loss increases with increasing the concentration of acid
This attributed to presence of water air and H+ which accelerate the corrosion process. This indicates that the corrosion rate of copper is a function of the concentration of acid solutions
Summary
Rectangular specimens of copper were mechanically pressed cut to form different coupons, each of dimension exactly 5 X 1.8 X 0.3 cm. The specimens were mechanically polished; a hole drilled at one end for free suspension and numbered by punching. The specimens were degreased with acetone, washed with distilled water and polished well with emery paper, cleaned, rinsed and dried, stored in desiccators for present study. All reagents for the present study were AR grade and double distilled water was used for their preparation. Each specimen was suspended by a glass hook and immersed in a beaker containing exactly 100 mL of the test solution and left exposed to air. The test specimens were cleaned with acetone. Triplicate experiments were performed in each case and mean values of the mass loss were calculated
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