Comment on “Electrochemical behavior of different structural states of the alloy Ti60Ni40” by S. Mathur et al. and related works

In the recent studies by Shubhra Mathur et al. [1], [2], [3], Ti60Ni40 alloys (metallic glasses) were investigated in terms of their corrosion behavior in dependence on ion beam irradiation [1] and in dependence on their crystalline state, i.e. crystalline, amorphous and nanocrystalline, [2] or “nanocrystalline I”, “nanocrystalline II” and “nanocrystalline III” [3]. Differences in corrosion behavior result in the formation of oxide films with different amounts of Ti0, Ti2 +, Ti3 +and Ti4 +, as deduced from the analysis of the spectral line shapes of Ti-2p spectra and O-1s spectra in X-ray photoelectron spectroscopy (XPS). Unfortunately, the authors' analysis of data from photoemission does not meet the physics of photoemission, and therefore, some statements from Ref. [1], [2], [3] are not beyond any doubt.