1 research outputs found
EVALUATION OF GROUNDNUT LEAVES EXTRACT AS CORROSION INHIBITOR ON MILD STEEL IN 1M SULPHURIC ACID USING RESPONSE SURFACE METHODOLOGY (RSM)
The inhibiting effects of Groundnut Leaves Extract (GLE) on corrosion of Mild Steel
in 1M H2SO4 acidic media was investigated in this study. The effect of the concentration
of inhibitor (0.2 - 1.0 g/l), time (3 – 5 days) and temperature (40�60 �) on corrosion
rate and Inhibition efficiency were investigated using Response Surface Methodology
(RSM). The Phytochemical analysis of the GLE was performed; the result showed that
organic constituents were present which made the Groundnut Leaves Extract a good
inhibitor. Mathematical models were derived for the groundnut leaves extract. The
optimum conditions obtained were temperature 49.72 OC, time 5 days and inhibitor
concentration of 0.29 g/l while the optimum Inhibition Efficiency at this optimum
condition was predicted to be 85.9%. The outcome of the ANOVA test confirmed a
confidence level of 95%. Gravimetric experiment was carried out at these optimum
conditions to validate the predicted optimum values. The obtained experimental value of
86.3% agreed closely with that obtained from the regression model. The micrographs
result of Scanning Electron Micrographs analysis showed that passive layer of film was
formed on the surface. This study has revealed that Groundnut Leaves Extract is a good
inhibitor for the corrosion of Mild steel in 1M H2SO4 solution