Corrosion Behavior of Anodic Films Formed on Aluminium 7A04 Alloy in Boric/Sulphuric Mixed Acid and in Chromic Acid

Shan Deng; Lei Xu; Qiu Ze Li; Xing Min Huang; Shu Lin Liang; Guang Ze Dai

doi:10.4028/www.scientific.net/AMR.399-401.95

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 399-401Corrosion Behavior of Anodic Films Formed on...

Corrosion Behavior of Anodic Films Formed on Aluminium 7A04 Alloy in Boric/Sulphuric Mixed Acid and in Chromic Acid

Abstract:

The corrosion behavior of the anodic oxide film on aluminium 7A04 alloy is investigated in current paper, where the different anodic oxide films are prepared. Morphology observation on different anodic films is carried out by using laser confocal microscopy (LCM) and copper sulfate test. Meanwhile, the electrochemical properties are evaluated through using electrochemical impedance spectroscopy (EIS). The LCM observation shows that the anodic oxide film formed in boric/sulphuric mixed acid is uniform with porous appearance, while the anodic oxide film formed in chromic aid is nonporous one but defective. The copper sulfate test results show that the corrosion regions almost developed from micropores in strong corrosive media. The evaluation of EIS in NaCl solution demonstrates that the corrosion resistance of specimen with anodic oxide film is much better than that without film. Furthermore, the corrosion resistance of anodic film formed in boric/sulphuric mixed acid is better than that formed in chromic acid.

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Advanced Materials Research (Volumes 399-401)

Pages:

95-98

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.399-401.95

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Online since:

November 2011

Authors:

Shan Deng, Lei Xu, Qiu Ze Li, Xing Min Huang, Shu Lin Liang, Guang Ze Dai

Keywords:

Anodic Oxide Film, Corrosion Resistance, Electrochemical Impedance Spectroscopy (EIS)

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