Abstract
The effect ofCassia siamealam. (CSL) root extract as a corrosion inhibitor of copper in 0.50 M NaOH solutions was investigated using absorbance difference technique at 30 °C and 40 °C. CSL root extract inhibited the corrosion of copper in 0.50 M NaOH solutions and the inhibition efficiency (% IE) increased to a maximum of 78.3±2.3% with increasing concentration of the extract but decreased with increasing temperature. The adsorption of CSL root extract on copper surface followed the Langmuir adsorption model with the average heat of adsorption, Qadsand free energy of adsorption, ΔGadsof -8.98 kJmol-1and -8.70 kJmol-1respectively. A kinetic treatment of the data revealed a first order kinetics with respect to copper in the presence and absence of the extract.
Highlights
Metals and alloys are often exposed to the action of acids and alkalis in industrial processes thereby prompting their deterioration[1]
This paper reports the effects of Cassia siamea L. root extract on both the corrosion of copper and kinetics of corrosion process of copper in 0.50 M NaOH solution using absorbance difference technique
The absorbance difference decreased gradually as the inhibitor concentration increased. This indicates that Cassia siamea lam. (CSL) root extract inhibits the alkaline corrosion of copper in 0.50 M NaOH solution
Summary
Metals and alloys are often exposed to the action of acids and alkalis in industrial processes thereby prompting their deterioration[1]. Root extract on alkaline corrosion of copper. This paper reports the effects of Cassia siamea L. root extract on both the corrosion of copper and kinetics of corrosion process of copper in 0.50 M NaOH solution using absorbance difference technique.
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