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US 4,400,246 AGranted
Process for applying barrier layer anodic coatings
AssigneeInternational Business Machines Corporation
InventorsGeorge A. Condas, Saad K. Doss
Life of this patent
Estimating the term…
Abstract
A barrier anodizing process for an aluminum alloy substrate employs an anodizing current having a density between 20 and 300 milliamps/cm.sup.2 to produce a 300 volt barrier layer in respectively 60 and 4 second
Claims4
A method of providing a barrier layer on the surface of an aluminum substrate comprising the steps of barrier anodizing said substrate at an anodizing current density of at least 20 milliamperes/cm.sup.2 for a very short period of time not to appreciably exceed the barrier formation time, said barrier anodizing being conducted in an acidic bath having a pH of between 5 and 7.
Dependencies are inferred from the claim text.