Electron Diffraction Study on Titanium Attacked by Various Acids

概要

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Titanium immersed in various acids were examined by electron diffraction. Surfaces attacked by hydrofluoric, hydrochloric, sulphuric or phosphoric acid suffered considerable corrosion and yielded Debye rings of a face-centred cubic lattice, which was deduced as belong to titanium hydride (TiH_2) formed in the course of corrosion. At the surfaces immersed in nitric acid at room temperature for a long period, however, hexagonal rings of titanium alone were observed, and these surfaces were taken as the standard for further corrosion tests. In the following cases the surfaces became passive, and protective films were formed : When the specimens were attacked by boiling nitric acid or aqua regia, anatase was formed, while a mixture of this and a rutile was seen after immersion in boiling 10 per cent solution of chromic acid. The surfaces immersed in boiling 10 per cent solution of ferric chloride for 1 hour yielded many sharp rings, which, however, could not be assigned to any known compound of titanium at the present stage.
東北大学の論文