Inhibitive effect of benzotriazole on the corrosion and corrosion fatigue of α‐Al bronze alloy in LiBr solution

Abstract

The effect of benzotriazole (BTAH) on the corrosion fatigue behavior of α‐Al bronze in 1 M LiBr solution has been investigated using reverse bending technique during testing it in LiBr/H2O system. The adsorption equilibrium estimated to be 1431.25 M−1 while the free energy of adsorption to be −27.968 kJ mol−1. The BTAH feature found to improve the fatigue life to a value near to that of α‐Al bronze in air. The optical and scanning electron microscopy for the α‐Al bronze for the fatigued in air, revealed that the fracture mode was transgranular and that the initiation and propagation was transcrystalline. α‐Al bronze fatigued in 1 M LiBr showed less fatigue resistance when compared to that of α‐Al bronze fatigued in air. The addition of 0.02 M of BTAH to 1 M LiBr increased the fatigue life and fatigue strength for α‐Al bronze where its fatigue behavior curve was close to that of air. The results demonstrated obviously a reduction of the corrosion fatigue resistance of α‐Al bronze in 1 M LiBr solution but it has a considerable increase in the presence of BTAH.