The oxidation behaviour of Zr-based bulk amorphous alloy Zr₆₅Cu_17.5Ni₁₀Al_7.5 has been studied in air environment at various temperatures in the temperature range 591–684 K using a thermogravimetric analyser (TGA). The oxidation kinetics of the alloy in the amorphous phase obeys the parabolic rate law for oxidation in the temperature range 591–664 K. The values of the activation energy and pre-factor as calculated from the Arrhenius temperature dependence of the rate constants have been found to be 1.80 eV and 2.12 × 10⁹ g cm^–2.sec^–1/2, respectively.

Potentiodynamic polarization studies were carried out on virgin specimens of amorphous alloys Ti₄₈Cu₅₂, Ti₅₀Cu₅₀ and Ti₆₀Ni₄₀ in 0.5 M HNO₃, 0.5 M H₂SO₄ and 0.5 M NaOH aqueous media at room temperature. The value of the corrosion current density (𝐼_corr) was maximum for Ti₄₈Cu₅₂ alloy in all the three aqueous media as compared to the remaining two alloys. The value of 𝐼_corr for the alloy Ti₄₈Cu₅₂ was maximum (𝐼_corr = 2.6 × 10^-5 A/cm²) in 0.5 M H₂SO₄ and minimum (𝐼_corr = 3.5 × 10^-6 A/cm²) in 0.5 M NaOH aqueous solutions. In contrast, the alloy Ti₆₀Ni₄₀ exhibited the least corrosion current density in 0.5 M HNO₃ (𝐼_corr = 4.0 × 10^-7 A/cm²) and in 0.5 M NaOH (𝐼_corr = 5.5 × 10^-7 A/cm²) aqueous media as compared to those for Ti–Cu alloys, while its value in 0.5 M H₂SO₄ was comparable to that for Ti₅₀Cu₅₀. It is suggested that the alloy Ti₆₀Ni₄₀ is more corrosion resistant than the alloys Ti₄₈Cu₅₂ and Ti₅₀Cu₅₀ in all the three aqueous media.