Effect of fluoride media on the stability of anodic ZrO sub 2 films

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Corrosion (Houston); (USA)

DOI:https://doi.org/10.5006/1.3585099· OSTI ID:6770418

Heakal, F E.T.; Mogoda, A S; Mazhar, A A; Ghoneim, A A ^[1]

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1. Cairo Univ., El Mansura (Egypt). Faculty of Science

Stability of anodic ZrO{sub 2} films on zirconium electrodes in sodium fluoride media was investigated using open-circuit impedance and potential measurements. The study indicates that the anodic oxide film comprises two layers; the extent of foreign ion incorporation during film growth in 1.0 N H{sub 2}SO{sub 4} is responsible for the difference in the physical nature of each of these layers. Furthermore, the extent of incorporation depends on both the initial formation CD and film thickness. The dissolution process follows a zero-order kinetic law. The results of potential measurements in 0.1 N NaF medium indicate that thin anodic ZrO{sub 2} films are more passive than thicker ones.

• OSTI ID: 6770418
• Journal Information: Corrosion (Houston); (USA), Journal Name: Corrosion (Houston); (USA) Vol. 46:3; ISSN 0010-9312; ISSN CORRA
• Country of Publication: United States
• Language: English

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CHEMICAL REACTIONS
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ELECTRODES
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HALIDES
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INTERFACES
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