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Effect of impurities on the electrochemical behaviour of aluminium electrodes anodized in phosphoric acid

✍ Scribed by Phan Trung Thanh; Akintane Akiyama; Takashi Saji

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
412 KB
Volume
27
Category
Article
ISSN
0013-4686

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✦ Synopsis

Al~tract--The electrochemical behaviour of anodic films formed on pure aluminium (99.999 % and 1100) and 6061-A1 alloy substrates in phosphoric acid has been investigated in an aluminium saturated phosphate solution of pH 6.23. The polarization resistance data obtained after one day immersion in the eloctrolytΒ© showed a strong correlation with the pit number, assessed from an outdoor atmospheric exposure test after 4 months, Thecathodic polarization me~urements of anodized aluminium in the electrolyte were also carried out. Electrochemical behaviour, eg corrosion, hydrogen evolution reaction, was interpreted in terms of "active sites" within the anodic film. It is suggested that the active sites were mainly formed in the presence of impurities or alloy constittients in aluminium substrates.

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