Corrosion mitigation of 6061 aluminium alloy hybrid metal matrix composite using a green inhibitor: experimental and theoretical investigations

Abstract

Carbohydrate compounds are recognized potent green corrosion inhibitors owing to their structural properties and eco-friendliness. This study showed the effectiveness of glucosamine sulfate (GAS), an eco-friendly green inhibitor, in mitigating the deterioration of 6061 aluminium alloy reinforced with 2% SiC and 2% B _4 C hybrid composite (6061AA-HMMC) material in 0.1 M hydrochloric acid (HCl) medium. Electrochemical measurements were carried out to quantify the corrosion rate in the absence and presence of the GAS. The results were included in an acceptable adsorption isotherm model, and a suitable mechanism for the corrosion inhibition process was discussed in detail. To comprehend the method of adsorption, the Freundlich isotherm model was applied. Different characterization techniques were used to verify the adsorption of the investigated inhibitor. The optimized structure of the GAS was analysed using density functional theory to provide further insight into its interaction with the metal surface. The infrared (IR) and UV-visible (UV) spectra for the adsorption of the inhibitor molecule were compared with the IR and UV spectra calculated by B3LYP/6-311++G(d, p).

Keywords

• glucosamine sulfate
• 6061AA-HMMC
• chemisorption
• DFT
• electrochemical impedance