Surface pretreatment of aluminium and aluminium alloys prior to adhesive bonding, electroplating or painting
Patent 4624752 Issued on November 25, 1986. Estimated Expiration Date: 
September 3, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 3, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3017285 3808000 Method of producing a support for a printing plate Patent #: 4116695 InventorsAssigneeApplicationNo. 06/771174 filed on 09/03/1985US Classes:205/148, Agitating or moving electrolyte during coating156/151, On adherent surface of lamina prior to assembly205/171, At least one anodic coating205/201, Predominantly aluminum substrate205/223Etching of coatingExaminersPrimary: Andrews, R. L.Attorney, Agent or FirmInternational ClassesC25D 11/24 (20060101)C25D 5/44 (20060101) C25D 11/18 (20060101) C25D 5/34 (20060101) Foreign Application Priority Data1983-06-02 GBAbstractA method of surface pretreatment for aluminium or aluminium alloys before adhesive coating, electroplating or painting comprises a first anodizing step using an acid selected to produce a dense-packed, thick-walled anodic oxide coating followed by an etching step to modify the outer surface of the oxide coating while leaving the inner part unaffected.The anodizing acid may be sulphuric acid or chromic acid and the etch acid may be phosphoric acid, chromic acid or a mixture of sulphuric and chromic acids.Other References
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