Inhibitive action of 2-aminobezothiazole on the deterioration of AA6061-SiC composite in 0.5M HCl medium: Experimental and theoretical analysis

Abstract

Electrochemical testing on AA6061-15% (V) SiC (P) composite corrosion in 0.5M HCl solution containing 2-aminobezothiazole (2-ABT) was performed. 2-ABT exhibited a good inhibition efficiency of 84% by acting as a mixed inhibitor. Polarisation studies showed a considerable reduction in corrosion rate, leading to increased inhibition efficiency with a rise in 2-ABT concentration. The increase in polarization resistance with a rise in 2-ABT concentration indicates the adsorption of 2-ABT on the composite, controlling corrosion. The evaluation of thermodynamic results revealed the physisorption of 2-ABT on the composite. The adsorption of 2-ABT followed Langmuir isotherm model. The surface morphological evaluation of composite specimens before and after inhibition supported the adsorption of 2-ABT on the composite. The results of quantum chemical calculations also confirmed the adsorption of 2-ABT.