Corrosion behaviour of amorphous Ti48Cu52, Ti50Cu50 and Ti60Ni40 alloys investigated by potentiodynamic polarization method

[摘要] 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 Ã�? 10^-5 A/cm²) in 0.5 M H₂SO₄ and minimum (𝐼_corr = 3.5 Ã�? 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 Ã�? 10^-7 A/cm²) and in 0.5 M NaOH (𝐼_corr = 5.5 Ã�? 10^-7 A/cm²) aqueous media as compared to those for Tiâ€�?�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.

[学科分类] 材料工程

[关键词] Amorphous alloys;polarization;potentiodynamic;corrosion.