Abstract
Inhibitive impact of Akuamma seed (AS) extract toward 1.0M HCl corrosion of aluminum was examined using response surface methodology (RSM). Gravimetric (weight loss), potentiodynamic polarization and electrochemical impedance spectroscopy techniques were used in the corrosion inhibition process. In all the method used, the seed extract acted as good corrosion inhibitor of aluminum in 1.0M HCl solution. Optimal inhibition efficiency of 72.6% was obtained at optimum inhibition concentration of 1.2g/l, temperature of 304.19k and maximized time of 11.53hrs. It showed that the plant extract has excellent inhibitive properties for the corrosion inhibition process. The values of kads are relatively small indicating that the interaction between the adsorbed extract molecules and aluminum surface is a physical process. The (AS) extract protects aluminum against pitting corrosion. The level of protection increases with increase extract concentrations. The extract inhibited both cathodic and anodic reactions and acted as mixed-type inhibitor.
Highlights
Corrosion resistance of aluminum is due to the formation of a thin and protective, naturally formed oxide film on its surface [1, 2]
It showed that the extract of Akuamma seed (AS) has excellent inhibitive ability for the corrosion inhibition process
The values of kads are relatively small indicating that the interaction between the adsorbed extract of AS molecules and aluminum surface is a physical process
Summary
Corrosion resistance of aluminum is due to the formation of a thin and protective, naturally formed oxide film on its surface [1, 2]. Most corrosion inhibitors studies have been focused on the development of “environmental friendly” compounds in response to current trend to legislation changes concerning environmental protection. This term includes formulations that are not toxic to humans, have low environmental impact, optimal biodegradability, and maintenance of high efficiency and cost-effectiveness [9]. Since the 1990s, some studies have confirmed the efficiency of natural compounds as corrosion inhibitors in line with the presence of complex organic compounds, with variety of different adsorption centers; heteroatom, double bonds and aromatic rings [10,11,12,13,14,15,16,17]
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