Abstract
The synergetic effects between hydroethanolic extracts of A. visnaga HE (AV) and Z. mays hairs HE (ZM) on corrosion of mild steel in 1 M HCl solution was investigated at 298 K by two techniques: potentiodynamic polarization (PP) methods (Tafel and Stern & Geary) and electrochemical impedance spectroscopy (EIS). The mixture of HE (AV)/HE (ZM) acted as an efficient corrosion inhibitor and its inhibition efficiency increased with concentration up to 96.55% at 0.01 gL−1 HE (AV)/0.2 gL−1 HE (ZM). The polarization curves revealed that the mixture acted as a mixed-type inhibitor, with anodic predominant action. The EIS studies were fitted by the (Rs + CPEdl)/(Rct + CPEf/Rf) equivalent circuit model. The kinetic parameters were in favor of a physisorption character of adsorption of HE (AV)/HE (ZM) components onto the mild steel surface. The influence of exposure time on the efficiency of mixture extract was investigated. Scanning electron microscopy (SEM/EDX) analyses confirmed the formation of a protective adsorbed film upon the mild steel surface.
Highlights
Corrosion of metals causes huge economic losses of billions of dollars every year in several industries around the world [1]
We provide an extension of an earlier study on the synergistic inhibition effect between HE (AV) and HE (ZM) on corrosion of mild steel in 1 M HCl solution by electrochemical techniques. e thermodynamic parameter Journal of Chemistry allows determining the type of adsorption on metal surface
We have taken the best concentration of HE (AV) which gave the best inhibition effect and it mixed with different concentrations of HE (ZM) until the inhibiting effectiveness achieved its maximum
Summary
Corrosion of metals causes huge economic losses of billions of dollars every year in several industries around the world [1]. One of the most practical and economical methods to protect industrial equipment from corrosion is the application of corrosion inhibitors [2] Most of these corrosion inhibitors can present a high risk to the environment and humans [3,4,5,6]. According to the literature [7], most recent contributions are those using plant extracts to inhibit corrosion of steel in acid solutions, for example, Ammi visnaga extract [8,9,10], corn silk [11], and a mixture of Hevea brasiliensis (rubber) and leaf of Zea mays (corn cob) [12]. There has been great need to improve the inhibitory effect of green inhibitors and reduce the cost of economic loss; eventual synergism can be considered as an effective way to improve the inhibiting efficiency of extracts
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