Effect of different acid anions on kinetics of the formation and dissolution behavior of anodic zirconium oxide
- Helwan Univ., Cairo (Egypt). Chemistry Dept.
- Ain-Shams Univ., Cairo (Egypt)
Effects of sulfuric acid (H{sub 2}SO{sub 4}), phosphoric acid (H{sub 3}PO{sub 4}), nitric acid (HNO{sub 3}), and hydrochloric acid (HCl) on kinetics of the formation and dissolution behavior of zirconium oxide (ZrO{sub 2}) were studied using the impedance, potential, and galvanostatic techniques. The oxide film did not form galvanostatically in 1 M HCl because of dissolution simultaneously with formation, while the rate of formation in other acids decreased in the order: H{sub 2}SO{sub 4} > H{sub 3}PO{sub 4} < HNO{sub 3}. Impedance and potential measurements reflected the same dissolution process, with the rate of formation decreasing in the order: HCl > HNO{sub 3} > H{sub 3}PO{sub 4} > H{sub 2}SO{sub 4}. The theory of anodization was applied, and data were collected for reciprocal capacity, electrolytic parameters, and field strength. Activation energy during the oxide film formation was calculated as 4.99 kJ/mol. A general treatment was applied using three models under galvanostatic conditions.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 669822
- Journal Information:
- Corrosion, Vol. 54, Issue 5; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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