Abstract: A method and a blasting material for producing a satinized surface on an aluminum substrate is provided. There is proposed a method for producing a satinized surface on an aluminum substrate, including the steps of: providing an aluminum substrate and treating by blasting with a blasting material the surface regions of the aluminum substrate provided that are to be satinized; wherein there is used as the blasting material a mixture of angular and spherical particles having a grain diameter D90 of ?0.3 mm.

Abstract: A method and a blasting material for producing a satinized surface on an aluminum substrate is provided. There is proposed a method for producing a satinized surface on an aluminum substrate, including the steps: providing an aluminum substrate; treating by blasting with a blasting material the surface regions of the aluminum substrate provided that are to be satinized; wherein there is used as the blasting material a mixture of angular and spherical particles having a grain diameter D90 of ?0.3 mm.

Abstract: A method and a blasting material for producing a satinized surface on an aluminium substrate is provided. There is proposed a method for producing a satinized surface on an aluminium substrate, including the steps of: providing an aluminium substrate and treating by blasting with a blasting material the surface regions of the aluminium substrate provided that are to be satinized; wherein there is used as the blasting material a mixture of angular and spherical particles having a grain diameter D90 of 0.3 mm.

Abstract: A method and a blasting material for producing a satinized surface on an aluminium substrate is provided. There is proposed a method for producing a satinized surface on an aluminium substrate, including the steps: providing an aluminium substrate; treating by blasting with a blasting material the surface regions of the aluminium substrate provided that are to be satinized; wherein there is used as the blasting material a mixture of angular and spherical particles having a grain diameter D90 of ?0.3 mm.

Abstract: A method for regenerating alkaline solutions for pickling aluminum is provided, by which aluminum hydroxide is recovered. A pickling solution containing aluminum hydroxide, aluminate and a complexing agent and further additives is transferred from a pickling bath into a reactor section, which consists of at least one reactor where aluminum is precipitated as aluminum hydroxide. The pickling bath has a higher temperature than the reactor section. The process is operated so that the concentration of aluminate, alkali and gluconate as well as the temperature in the pickling bath, on the one hand, and the temperature gradient from the pickling bath to the reactor section, on the other hand, are adjusted so that the pickling solution in the pickling bath is undersaturated or metastably supersaturated with respect to precipitation of aluminum hydroxide, however, unstably supersaturated in the reactor section. A device for carrying out the process of the invention is also disclosed.

Abstract: Substituted diphenols, phenyl ethers containing two oxygen atoms attached to a benzene nucleus, and naphthols are more practically effective than previously known additives in stabilizing tin (II) salts, in electrolyte solutions useful for coloring anodized aluminum by electrolysis therein, against oxidation to tin(IV) by reaction with ambient oxygen. Preferred additives include 2-tert-butyl-1,4-dihydroxybenzene, methylhydroquinone, trimethylhydroquinone, 4-hydroxynaphthalene-2,7-disulfonic acid, and p-hydroxyanisole. If p-toluenesulfonic acid or napthalene sulfonic acid are also used in the electrolyte, the throwing power can be greatly improved.

Abstract: A process and circuitry for the electrolytic coloring of an anodized article of aluminum or aluminum alloy in a coloring bath containing at least one metal salt for coloring the article. The process comprises applying to the coloring bath a controllable, asymmetrical and substantially sinusoidal a.c. voltage of substantially constant frequency. The sinusoidal a.c. voltage is obtained from a voltage source supplying a symmetrical sinusoidal a.c. voltage and at least one of the two current paths is divided into two parallel main lines and fed to electrical components whereby the amplitude level of the positive half wave and the amplitude level of the negative half wave and the ratio of the amplitude level of the positive half wave to the amplitude level of the negative half wave of the a.c.

Abstract: In the process of sealing decorative anodized aluminum oxide coatings in hot aqueous solutions, superior results are obtained when the sealing solutions contain 1-phosphonopropane-1,2,3-tricarboxylic acid, 1,1-diphosphonopropane-2,3-dicarboxylic acid, and/or alkali metal and/or alkanolamine salts of these acids. The presence of these acids or their salts prevents the formation of bloom and allows shorter sealing times with equivalent quality, and the addition of as little as 1 ppm of aluminum ions to such solutions also prevents iridescence.

Abstract: Undesirable greenish tinges that normally result when coloring anodized aluminum by AC electrolysis in solutions of silver salts can be avoided by adding to the electrolytes an appropriate amount of p-toluenesulfonic acid and/or its salts. The coloring solution may also contain (i) sulfuric acid, (ii) alkali metal, ammonium and/or alkaline earth metal salts of sulfuric acid and/or (iii) alkali metal, ammonium and/or alkaline earth metal acetates.

Abstract: A process and circuitry for the electrolytic coloring of an anodized article of aluminum or aluminum alloy in a coloring bath containing at least one metal salt for coloring the article. The process comprises applying to the coloring bath a controllable, asymmetrical and substantially sinusoidal a.c. voltage of substantially constant frequency. The sinusoidal a.c. voltage is obtained from a voltage source supplying a symmetrical sinusoidal a.c. voltage and at least one of the two current paths is divided into two parallel main lines and fed to electrical components whereby the amplitude level of the positive half wave and the amplitude level of the negative half wave and the ratio of the amplitude level of the positive half wave to the amplitude level of the negative half wave of the a.c.

Abstract: A process for the electrolytic coloring of anodized surfaces of aluminum or aluminum alloys using alternating current or direct current superimposed on alternating current, the electrolytic coloring being carried out with an electrolyte which contains cationic organic dyes and, optionally, conducting salts.

Abstract: Liquid phosphate-free single phase degreasing compositions for aluminum surfaces containing one or more builders, sequestrants and surfactants in aqueous alkaline solution, particularly containing alkali metal and/or ammonium carbonate, alkali metal and/or ammonium hydrogen carbonate, one or more acrylic polymers, optionally one or more other complexing agents which complement or partly replace the acrylic polymers, one or more anionic or nonionic surfactants, optionally other active substances and/or auxiliaries of the type normally used in degreasing compositions and water.

Abstract: A process and composition for producing colorless, cold-sealed, anodized aluminum or aluminum alloy surfaces. The composition comprises an aqueous solution containing nickel ions and a solution of at least one azo or azo metal dye, the colors imparted by the nickel ions and dye offsetting each other.

Abstract: Preservatives for aluminum surfaces in the form of a polymer dispersion based on an acid-group-containing acrylate copolymer which is cross-linked with divalent metal salts, which contains plasticizers and surfactants, and which, optionally, contains oxidized polyethylene and/or a copolymer of styrene and maleic acid anhydride. The preservatives are suitable for the preserving aftertreatment of aluminum, particularly electrolytically oxidized aluminum.