Corrosion inhibition of aluminum in HBr solutions by nonionic surfactants at different temperatures

The influence of nonionic surfactant micelles such as Tween 80, polyethylene glycol 400, and coco glucoside on the inhibition of aluminum corrosion in hydrobromic acid solutions was investigated via weight reduction, thermometric, and electrical conductivity techniques.In the absence of inhibitors, the rise in temperature and acid levels has led to a tremendous acceleration in the aluminum corrosion in HBr solutions.Intriguingly, coco glucoside, PEG 400, and Tween 80 have shown a remarkable inhibitory action on the corrosion of aluminum in the corrosive solutions at different temperatures.The findings demonstrated that the inhibition efficacy of inhibitors and the extent of surface coverage of the micelles on aluminum rise with higher concentration of the inhibitor and decline with rising temperature.Notably, Tween 80 was a more effective inhibitor than PEG 400, and coco glucoside at all temperatures.This effect may be explained by the force and type of their micelles' adsorption on the aluminum surface, which occurs when hydrophilic regions of coherent layers of micelles donate their electrons to the metal surface.Also, the thermodynamic factors (ΔH 0 , ΔS 0 , and Ea) for the corrosion and adsorption processes were assessed and addressed.The experimental data were best fit by models of Langmuir, Temkin, and Flory-Huggins adsorption isotherms fit each other well.