Corrosion behaviour of Ti6Al4VxCryNi alloys fabricated by μ-plasma arc powder additive manufacturing process

Abstract

This manuscript examines development of noble corrosion-resistant Ti6Al4VxCryNi alloys by μ-plasma arc powder additive manufacturing (μ-PAPAM) process for chemical, shipbuilding, and aerospace industries. Inclusion of chromium and/or nickel to Ti6Al4V alloy decreased corrosion rate and corrosion current density and increased corrosion potential and polarisation resistance, implying increased corrosion resistance. The EIS findings indicated that the values of polarization resistance and layer thickness of oxides increased with the addition of chromium and/or nickel to Ti6Al4V alloy. Smaller size pits were observed on the corroded surfaces of developed Ti6Al4VxCryNi alloys due to the formation of relatively more stable layer of Cr2O3 and NiO enabled by the inclusion of chromium and/or nickel to Ti6Al4V alloy. It improved the surface finish of the developed alloys, indicating less damage by their corrosion and the appearance of small-size pits due to layer formation of Cr2O3 and NiO. As compared to Ti6Al4V alloy, Ti6Al4V5Cr alloy has maximum corrosion resistance followed by Ti6Al4V2.5Cr2.5Ni and Ti6Al4V5Ni alloy. © 2024 Elsevier B.V.