| 摘要 |
<p>1,259,972. Electro-depositing chromate layer. WESTERN ELECTRIC CO. Inc. March 20, 1969 [April 3, 1968], No. 14585/69. Heading C7B. A surface containing at least 50% copper is joined to organic material by a process comprising passing a current through the surface as cathode while the surface is in contact with a solution containing chromate ion and having a pH of at least 4 and then joining the surface to the organic material. The solution may contain chromate ions in amount from 0À001% by weight up to saturation, preferably as a compound with an alkali metal or alkaline earth metal. The required alkalinity of the solution may be obtained by adding phosphates, hydroxides or carbonates of metals of Groups I or II and Group I or II metal citrates, tartrates, oxalates or gluconates may be added as copper complexing agents. Current may be passed at a voltage of 1-20 volts for at least one second. Preferably the copper surface is preliminarily degreased and descaled by known methods. Organic materials which may be joined to the treated surface include carboxyl-olefins, epoxy resins, nitrile rubber phenolics, polyvinyl butyrals, polyvinyl formals, alkyds, acrylics, polyesters, urethanes and silicones.</p> |
