© Journal Of Chemical Society Of Nigeria (jcsn) . 2010. Vol. 35 No. 1
Publisher: Chemical Society of Nigeria
Chloroquine As Corrosion Inhibitor For Mild Steel In 1 M Sulphuric Acid.
C. E. Duru, V. O. Njoku, A. A. Ayuk, I. A. Obiji
KEYWORDS: mild steel, weight loss, N4-(7-chloroquinolin-4-yl)-N1,N1-diethylpentane-1,4-diamine (CDPD), corrosion inhibition, adsorption isotherms.
ABSTRACT:The corrosion inhibition of mild steel in 1 M H2SO4 at 30, 35, 40 and 45oC in the presence of N4- (7-chloroquinolin-4-yl)-N1,N1-diethylpentane-1,4-diamine (CDPD) was studied using weight loss method. The weight loss results showed that CDPD is a good corrosion inhibitor for mild steel in 1 M H2SO4 at all the temperatures studied. This is evident in the high inhibition efficiencies obtained even at elevated temperatures, and also relative to those obtained by other workers using different compounds. The inhibition efficiency increased with increasing concentration of the compound and decreasing temperature. The adsorption of the inhibitor on the mild steel surface in the acid solution was found to obey Langmuir adsorption isotherm at 30oC, showing that the inhibitor functioned through monolayer adsorption on the mild steel surface. The apparent activation energy for the redox process in the inhibited acid solution was three times higher than that in the blank solution, implying increased impedance of the corrosion reaction in the inhibited acid media.
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