The corrosion behaviour of Ti‐6Al‐xV‐yFe (where x + y = 4; x = 0–3; and y = 1–4) experimental alloys in comparison with commercial Ti‐6Al‐4V alloy was investigated in sodium chloride and sulphuric acid solutions. Iron, a less expensive beta stabilising element was substituted for vanadium in the newly developed alloys in order to assess the influence of iron addition on the corrosion performance of the alloys. Electrochemical parameters were obtained using open circuit potential and potentiodynamic polarisation measurements. The results show that partial replacement of vanadium with 2–3 wt% iron yielded excellent corrosion resistance in 3.5 wt% sodium chloride. The experimental alloys have better corrosion resistance than the commercial Ti‐6Al‐4V alloy in 3.5 M sulphuric acid.
This paper presents an overview of the corrosion behavior of titanium (Ti) alloys in both acidic and saline solutions. The solutions covered in this review are essentially the typical electrolytes encountered by Ti alloys when applied under service conditions. Although Ti alloys are generally known to be corrosion resistant, this review identifies strong reducing acids and fluoride-containing solutions as electrolytes that corrode Ti and its alloys. The pathways that the knowledge of the corrosion behavior of Ti alloys have followed from the 1950s to date are captured in this review. Based on this, the different factors influencing the corrosion behavior of Ti alloys are highlighted and the different research concepts for improving the corrosion resistance of Ti alloys in both solutions are discussed. The limitations of these research concepts are mentioned and the directions for future research are proposed.
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