Coating aluminium with fluorocarbon resins - after degreasing by acid DC electrolysis or with detergent and etching

Al is degreased, either (1) switched as cathode, by DC electrolysis, in diluted aq. H2SO4 soln. or (2) by treatment with an aq. soln. of a synthetic washing agent or detergent. The degreased Al, switched as anode, is etched by DC electrolysis in an aq. chloride soln. having a Cl ion concn. =1 (0.1-1...

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Bibliographische Detailangaben
1. Verfasser:	KIYOMI YANAGIDA, TADASHI HIROKANE, SHIGERU OKAZAKI ET KUNIHIKO HORI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPARATUS THEREFOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CHEMISTRY ELECTROLYTIC OR ELECTROPHORETIC PROCESSES METALLURGY PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS SPRAYING OR ATOMISING IN GENERAL TRANSPORTING
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Beschreibung
Zusammenfassung:	Al is degreased, either (1) switched as cathode, by DC electrolysis, in diluted aq. H2SO4 soln. or (2) by treatment with an aq. soln. of a synthetic washing agent or detergent. The degreased Al, switched as anode, is etched by DC electrolysis in an aq. chloride soln. having a Cl ion concn. =1 (0.1-1) wt.%, at bath temp. >=20 (30-90) degrees C and >=7 (7-60). Coulomb/cm2. The etched Al is coated with a fluorocarbon resin dispersion, dried and baked. Al surface is uniformly provided with fine etching "troughs", giving a fluorocarbon coating which is adherent, dense, free from shrink holes and cracks.