Corrosion Resistance of Sintered Commercially Pure Titanium in Inorganic Acids after Oxidation and Nitriding

摘要

The corrosion resistance of oxidized and nitrided commercially pure titanium obtained by sintering of powders of titanium, titanium hydride and their mixtures was evaluated in 20% aqueous solution of hydrochloric acid and 40% aqueous solution of sulfuric acid. It was determined that surface oxide film decreased the corrosion rate by three orders of magnitude for titanium obtained by powder metallurgy, and by one order for titanium obtained by deformation technology. In the absence of a surface film at oxidation of the sintered titanium, the corrosion rate decreased by 1–2 orders of magnitude compared to untreated titanium. It was shown that stage nitriding led to decrease in corrosion rate by 3–4 orders of magnitude for titanium obtained by both technologies.