Corrosion resistance of the Ti–50Zr at.% alloy after anodization in different acidic electrolytes

The stability of oxide films potentiodynamically (50 mV s−1) grown up to 8.0 V(SCE) on Ti–50Zr at.% in H2SO4, HNO3, CH3SO3H, and H3PO4 (pH ≈ 1) was assessed in the growth electrolyte itself or in a Ringer solution. For all anodizing electrolytes, oxide films become stabler as their thickness increases. In the Ringer solution, the oxide film stability is affected by the anodizing electrolyte; for oxides grown up to 8.0 V(SCE), films obtained in H3PO4 are slightly less stable than the ones obtained in the other acids, whereas films obtained in H2SO4 are clearly the stablest ones.

Research highlights
► Oxide films are potentiodynamically grown on Ti–50Zr in different acidic solutions.
► The stability of the anodic oxide films is assessed in the acidic and Ringer solutions.
► The extent of dissolution of the oxide films decreases as they become thicker.
► The anodic oxide film grown on Ti–50Zr in the H3PO4 solution is the less stable one.
► The stablest anodic oxide film on Ti–50Zr is the one grown in the H2SO4 solution.