Purpose – This paper seeks to evaluate the effect of natural menthols and their synthesised epoxy‐allylmenthols as a non‐toxic inhibitor on the corrosion of steel in HCl media at various temperatures. Design/methodology/approach – Epoxy‐allylmenthols were synthesised and characterised. Gravimetric technique was used to measure the efficiency of corrosion inhibition. Findings – Modified allylmenthol (to epoxy‐allylmenthol) exhibited a good inhibition. But its efficiency decreases with temperature. Research limitations/implications – The inhibition efficiency increases with the concentration of inhibitor to attain 74 percent at 0.8 g/l. Practical implications – The efficiency of menthol derivatives increases with the concentration but decreases with rise of temperature in the 303‐328 K range. Natural inhibitor can be used in chemical cleaning and pickling processes. Originality/value – The originality of this work is to find a safe and cheap eco‐friendly inhibitor from natural plants.
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Faska et al. (2007) studied this question.
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