Assessment of Corrosion Inhibition Performance and Adsorption Thermodynamics of Hydrogen Phosphate (HPO ₄ ²⁻ ) and Molybdate (MoO ₄ ²⁻ ) Oxyanions on Tin in Maleic Acid

The influence of hydrogen phosphate (HPO42−) and molybdate ions (MoO42−) on the behavior tin corrosion in 0.2 M maleic acid was compared using experimental theoretical techniques. studies consisted electrochemical investigations (potentiodynamic polarization (PDP) impedance spectroscopy (EIS)), along with surface analytical techniques (SEM EDX). Additionally, analysis (the chemical quantum computations at MP4/SDD level theory aqueous phase), conducted. outcomes illustrated that inhibition efficiency (η%) increases concentration inhibitors, reaching 88 % 81 2×10−2 MoO42− HPO42−, respectively. potentiodynamic curves revealed HPO42− performance is a cathodic-type inhibitor, while shows mixed-type behavior. increase temperature decreased η% values both inhibitors. Based thermodynamic study, presence two inhibitors formed protective films through physisorption mechanism. complete fourth-order Møller Plesset perturbation (MP4 SDD basis) method results outlined favorable affinity investigated inorganic to interact surface, which interprets well-observed efficiencies.