The inhibitory properties of the boiling extracts from <i>Chenopodium album</i> and <i>Polygonum aviculare</i> aerial parts on the corrosion of mild steel in hydrochloric acid medium

Abstract The inhibitory ability of the boiling extracts from the aerial parts of Chenopodium album and Polygonum aviculare on the corrosion of mild steel EN Fe37-3FN in 0.5 M hydrochloric acid medium was investigated using electro-chemical methods and EIS. It was shown that the addition of 90 mg/l of the Chenopodium album aerial parts extract reduces the corrosion rate by 35%, and that of of 1 g/l and more – by 75%, whereas the addition of 120 mg/l of the Polygonum aviculare aerial parts extract reduces the corrosion rate by 40%, and that of of 1 g/l and more – by 85%. The adsorption of the extract components on a steel surface follows the Langmuir adsorption model, and the nature of adsorption is physical. The Chenopodium album and Polygonum aviculare aerial parts extracts show themselves as perspective and environmentally friendly substances for reducing the steel corrosion rate in acidic environments.