Passiflora edulia Sims leaves Extract as renewable and degradable inhibitor for copper in sulfuric acid solution

In this research, we obtained Passiflora edulia Sims leaves Extract (PESLE) using a simple and green pure water extraction method. Experiment and theoretical calculations data show that PESLE can effectually restrain Cu corrosion in H2SO4 medium. Electrochemical results demonstrate that the PESLE is 800 mg/L, its anti-corrosion nature can reach about 96%. And with the augment of temperature, the anti-corrosion capacity of PESLE can still reach about 95% at a temperature of 318 K. SEM and AFM morphology test data show that PESLE is adsorbed onto the copper interface, the copper sample is effectively protected and the surface becomes relatively flat. The morphology test results directly prove that PESLE efficaciously restrain the corrosion of Cu in H2SO4 environment. XPS test results show that PESLE adsorption onto the Cu interface can detect Cu-N bond, which proves that chemical adsorption occurs. Quantum chemistry calculation data manifest that the three components of PESLE can reveal high anti-corrosion property. Molecular dynamics simulation data manifest the three components of PESLE can be adsorbed at the Cu (111) surface with paralleled way, and can have a large binding energy.

Automated summary

In this study, Passiflora edulia Sims leaves extract (PESLE) was obtained using a simple and environmentally friendly water extraction method. The research demonstrated that PESLE can effectively inhibit copper corrosion in sulfuric acid medium. Experimental and theoretical calculations showed that PESLE at a concentration of 800 mg/L achieved a corrosion inhibition efficiency of approximately 96%. The anti-corrosion capacity of PESLE remained at around 95% even at a temperature of 318 K. Morphology tests indicated that PESLE was adsorbed onto the copper interface, effectively protecting the copper sample and resulting in a relatively flat surface. XPS test results confirmed the chemical adsorption of PESLE onto the copper interface through the detection of Cu-N bonds. Quantum chemistry calculations and molecular dynamics simulations demonstrated the high anti-corrosion property of the three components of PESLE.