The anticorrosive applications of anionic surfactant on AA2024-T3 aluminum alloy in alkaline medium: Experimental and theory

Inhibitory effects of sodium abietate (SA) and sodium lignin sulfonate (SLS) were discussed using a series of tests and theoretical calculations. Experimental outcomes obtained via weight loss and electrochemistry data showed that SA and SLS significantly inhibited the corrosion of AA2024-T3 Aluminum alloys in NaOH media. The inhibition efficiency ( η %) for SA and SLS was up to 96.02% and 98.82% at 5 × 10 −3 mol·L −1 , respectively. SA and SLS acted as anode-dominated mixed-type inhibitors in aggressive solutions as recorded by electrochemical methods. In addition, the surface analyses further corroborated the protection of the metal surface from corrosion as added with SA and SLS that can form an adsorbed film on the metal surface. The adsorption obeyed Langmuir isotherm which illustrated the adsorptions of the SA and SLS were a mix of physical and chemical adsorptions. Moreover, the inhibition performance of both inhibitors with the molecular structure shown in quantum chemical calculations and molecular dynamics simulation found that be suitable for explaining the inhibitive action of the two. The study suggests SA and SLS as green sources appropriate for anticorrosive applications.