The inhibitory properties of the boiling extracts from Malus sylvestris and Syringa vulgaris flowers on the corrosion of stainless steel in sulphuric acid medium

Abstract

Boiling extracts from Malus sylvestris and Syringa vulgaris flowers were evaluated as green corrosion inhibitors for stainless steel in 0.5 M sulphuric acid using electrochemical methods. The addition of 10 mg/L of the Malus sylvestris flower extract reduced corrosion by 15%, while 10 g/L achieved 65% reduction. The Syringa vulgaris extract achieved similar 65% inhibition at higher concentrations. Both extracts followed Langmuir adsorption models and represent environmentally sound alternatives for reducing steel corrosion in acidic conditions.