Effect of Interstitial Elements and Iron on Corrosion Resistance of Commercially Pure Titanium in Hydrochloric Acid and Sulfuric Acid

Abstract

An investigation was carried out about the effect of interstitial elements and iron on corrosion resistance of commercially pure titanium in hydrochloric acid and sulfuric acid at room temperature and their boiling temperatures.
The results obtained in this study were summarized as follows.
(1) Oxygen, nitrogen or carbon, up to 0.5%, improved the corrosion resistance of commercially pure titanium in hydrochloric acid and sulfuric acid.
(2) Addition of iron to the specimens containing oxygen, nitrogen or carbon, showed a tendency to decrease corrosion resistance.
(3) The specimen containing semi-transformed structure was inferior to equiaxed α structure as for corrosion resistance.
(4) Anodic polarization was measured in the hydrochloric acid by Gerischer type potentiostat. And the above mentioned results were confirmed from the standpoint of anodic polarization.