Mechanism of Titanium Corrosion in Mineral Acids and Their Mixtures
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The corrosion resistance and electromechanical behavior of titanium in solutions of sulphuric, hydrochloric, and phosphoric acid in the 20-80 deg C temperature interval were studied. It was shown that given identical solution acidity, the most aggressive with respect to titanium is sulphuric acid. The addition of sodium chloride and sulphate to phosphoric acid stimulates titanium dissolution. Sodium phosphates slow down titanium corrosion in sulphuric and hydrochloric acid slightly. The most effective in this respect is tertiary sodium phosphate. A foundation was developed for selecting a solution for the chemical removal of scale which forms on titanium at 780-820 deg C.
- Properties of Metals and Alloys