Corrosion of Nitrided Titanium (1st Report)

Corrosion in Hydrochloric Acid and Sulfuric Acid

Abstract

Corrosion resistance of nitrified titanium was evaluated by measurement of corrosion potential and corrosion rate in 20% HCl and H₂SO₄. It was found that nitride layer remarkably inhibits active dissolution of titanium in these acid solutions. There is a correlation between the structure of nitride layer and potential decay curve. X-ray analysis showed the existence of only TiN and ε-TiN in the nitride layer, but the results of potential measurement and chemical analysis of dissolved ions suggested the existence of unknown higher nitride which composes the outermost thin layer.