Almond waste extract as an efficient organic compound for corrosion inhibition of carbon steel (C38) in HCl solution

In this study, the corrosion inhibition efficiency of almond waste extract on carbon steel (C38) in 1.0 M HCl solution was evaluated using gravimetric analyses, electrochemical tests, and surface characterization. Electrochemical results suggest that almond waste extract significantly enhances the corrosion resistance of C38. To control and understand the stability and adsorption ability of the inhibitor on the steel surface, C38 was tested for various concentrations and temperatures without and with extract inhibitor. The results show that the almond waste exhibits an out-standing inhibition performance in the different experimental conditions. Extract of almond waste acted as a mixed type inhibitor and the adsorption of the corrosion inhibition of C38 was evaluated by Langmuir isotherm model. Adsorption thermodynamic parameters were computed and interpreted. FT-IR analysis and surface morphology affirmed the formation of protective film on C38 surface. The results obtained from experiments revealed that the almond waste extract has a considerable ability to adsorb on C38 surface with high stability of corrosion inhibition at all concentrations were studied here, particularly at high temperatures. [Display omitted] •New bioactive extract acted as an efficient green inhibitor for carbon steel (C38) surface under corrosive environment.•Extract of almond waste yields high inhibition efficiency at low concentration.•The adsorption process of bioactive inhibitor follows Langmuir isotherm.•SEM and FT-IR analyses confirm the formation of organic film on C38 surface.