Table 9: Thermodynamic parameters for the adsorption of (0.04 × 10−2) M/L mixed ligands and their metal complexes on aluminum metal in aqueous solution of 1 M HCl at different temperatures for 7 hrs.

CompoundTemp. (K)Corrosion rate ×10−4 (g· h−1· cm−2)IE% (kJ·mol−1) (kJ·mol−1) (kJ·mol−1) (kJ·mol−1·K−1)

Blank2933.4766.00247.55652.080−0.0149
3037.32
31311.58

Mixed ligand (Arg: Glu) ratio (1 : 1)2931.84869.52861.19153.2680.0262
3034.7635
3138.3428

(1)2930.977258.82246.51754.165−0.0252
3031.7676
3132.9076

(2)2931.535660.45943.02555.510−0.0412
3033.2256
3134.9857

(3)2931.635361.84541.03056.139−0.0499
3033.3754
3135.2155

(4)2930.737957.68845.81054.035−0.0271
3031.5479
3132.0882