期刊
GREEN CHEMISTRY LETTERS AND REVIEWS
卷 3, 期 1, 页码 7-15出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/17518250903447100
关键词
corrosion; green inhibitor; mild steel; Azadirachta indica extract; Frumkin
The corrosion inhibition and adsorption properties of Neem (Azadirachta indica - AZI) mature leaves extract as a green inhibitor of mild steel (MS) corrosion in nitric acid (HNO3) solutions have been studied using a gravimetric technique for experiments conducted at 30 and 60 degrees C. The results disclose that the different concentrations of the AZI extract inhibit MS corrosion and that inhibition efficiency of the extract varies with concentration and temperature. For extract concentrations studied and ranging from 9.09 to 28.57 mg/L, the maximum inhibition efficiency was 80.5 and 80.07% both at 28.57 mg/L AZI at 30 and 60 degrees C, respectively, in 2.0 N HNO3. The adsorption of the inhibitor on the MS surface was exothermic and consistent with the physical adsorption mechanism, best described by the Frumkin adsorption isotherm.
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