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C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
C25D11/02—Anodisation
C25D11/04—Anodisation of aluminium or alloys based thereon
C25D11/14—Producing integrally coloured layers
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Chemical Kinetics & Catalysis
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Electrochemistry
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Materials Engineering
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Electroplating Methods And Accessories
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Abstract
Low resistance porous, bronze-coloured anodic coatings are produced on Al by immersing into an aqs. electrolyte consisting of boric hydroxycarboxylic chelate acid anions formed in equilibrium with boric acid, and a hydroxycarboxylic acid capable of forming a complex boric chelate with a resulting increase in H ion conc. of the electrolyte and at least 0.001 g/l sulphate ions from sulphuric acid, water soluble sulphate or bisulphate salts. The current density used during anodising is 12-36 A/ft2.
NL7210807A1972-08-071972-08-07Anodising aluminium to produce thick films - using boric/hydroxy carboxylic chelate acid anions with sulphuric acid
NL7210807A
(en)
Effect of the Conditions of Chromate--Dichromate Sealing of Anodic Aluminum Oxides Formed in Acidic and Alkaline Electrolytes on Some of Their Properties