Title: Method for closing anodic aluminium oxide
Application Number: 86104714 Application Date: 1986.07.09
Publication Number: 1016046 Publication Date: 1988.01.27
Approval Pub. Date: Granted Pub. Date: 1989.11.15
International Classifi-cation: C25D11/18
Applicant(s) Name: Oceanic Technology Inst., National Bureau of Ocean Address:
Inventor(s) Name:
Attorney & Agent: LIU XIAOQIANG CUI LIZENG
Abstract:
     This invention includes the macerating the anodic aluminium oxide in ammonia water or basic solutions of alkali metal oxide or carbonate compound or hydrocarbonate compound, and then closing it in water solution of nickel nitrate or acetate or sulfate.The anodic aluminium oxide closed by this method offers an excellent corrosion resistance. It is shown by a field full-immersion test in seawater that corrosion resistance offered with this method was increased by 6~7 times more than that obtained by the conventional methods. This invention is used both for applications in seawater and chlorine ion medium, and for application in atmosphere.
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