Siemens Aktiengesellschaft

Richard Dotzer

Klaus Stoger

Enno Todt, Deceased

Johann Gehring

Josef Stadter

Hans-Georg Hauschildt

Siegfried Birkle

Winfried Plundrich

Eva Rissel

Georg Iwantscheff

Ernst-Friedrich Lechner

By Susanne Todt, Legal Heir

By Ruth Todt, Legal Heir

By Susanne Todt, Heir

By Ruth Todt, Heir

Ernst Josef Todt, Heir

Hans-George Hauschildt

The invention relates to circuit boards consisting of a flat core plate, 1 to 5 mm thick, of metallic material, graphite or electrically conductive carbon with a coating, 10 to 80 .mu.m thick, of electroplated aluminum eloxal and, optionally, an intermediate layer of copper or silver, 0.1 to 2 .mu.m thick. On the electroplated Al eloxal layer, a conductor run structure generated by an additive or subtractive technique may be present. The highly heat-conducting and mechanically strong circuit boards find application in electronics.

Heat-removing circuit boards

The chemical plotting of boundary layer flows in liquids with the use of uncompacted, coated, anodically oxidized aluminum surfaces is effected using a colored or uncolored liquid or a coating or pointillization with a substance, preferably a dye, soluble in water or organic media and which can be included or adsorbed in the eloxal layer. The process serves to plot boundary layer flows in water, organic media and oils in a wide temperature range.

Process for the chemical plotting of boundary layer flows, and

Above the electroplating trough, a lock chamber is arranged which can be flooded with protective gas and is subdivided by means of an intermediate door into an outer chamber and a main chamber. The outer chamber has an outer lock door while the main chamber is connected to the electroplating trough by an inner lock opening. In addition, a work piece transfer device is provided which can be moved between the outer chamber and the main chamber and can be operated from the outside.

Apparatus for the electrodeposition of aluminum

Articles made of ferrous, non-ferrous and light metals and alloys thereof, e.g., aluminum, beryllium, magnesium, molybdenum, steel, tantalum, titanium, tungsten, vanadium and zinc and their alloys, are pretreated before coating and surface finishing in an anhydrous, inert, aprotic liquid, and subsequently electroplated with aluminum, cadmium, indium or zinc in an aprotic organo-metal electrolyte essentially free of molecular oxygen and water and, optionally, additionally finished by anodizing, chemical oxidation or diffusion. The pretreatment may be by erosion with finely-divided abrasive particles suspended in such liquid and impinged upon the surface of the article by hydraulic jetting, or with an aprotic liquid by the liquid-drop erosion method. Alternatively, the pretreatment may be by electrolytic action in a circuit where the article serves as the anode and is immersed in an anhydrous, aprotic electrolyte. Articles so pretreated and electroplated are thereafter more readily surface-finished or mechanically shaped.

Process of mechanically shaping metal articles

The invention relates to a method for the currentless catalytic precipitation of aluminum. The surface of insulating and conductive materials (substrates) to be aluminized is (1) catalyzed, while a film-forming moisture-insensitive layer is developed, with a compound active at the boundary surfaces, by a brief immersion in a dilute solution of (a) a modified ester or acylate of titanium, zirconium or vanadium, substituted at the metal atom with short- and long-chain organic radicals or (b), a chloride of the transition metals of the IV and V secondary group of the periodic system of the elements and a water-containing metal soap of a polyvalent metal, preferably aluminum soaps; (2) is intensively rinsed with aprotic solvents, preferably having a boiling point of over 100.degree. C.; and (3) is immersed in a 1 to 4% solution of trialkylaminalanes in a solvent mixture of aromatic and highly viscous aliphatic compounds. A homogeneous and strongly adhering aluminum coating is thereby obtained. Insulating and conductive materials and components, e.g., electronic components and reflectors can in this manner be homogeneously coated with strongly adherent aluminum.

Method for the currentless catalytic precipitation of aluminum

The invention concerns a method for the preparation of additives for influencing the electrocrystalline growth in aprotic oxygen- and water-free organo-aluminum electrolyte media. A compound which contains a sulfonimide or sulfonamide group as the reactable group, preferably, N-benzoylbenzenesulfonimide, optionally in the presence of an inert organic solvent, is reacted with at least one organoaluminum compound of the general formula AlR.sub.3, where R is an alkyl radical, in the ratio of 1:1 to 1:6. The additives obtained furnish a bright aluminum coating on metals and conductive materials in direct electrodeposition.

Method for the preparation of additives in organo-aluminum electrolyte

Methods of coating and surface finishing articles made of metals and

Apparatus for electrodepositing aluminum from aprotic, oxygen-free and water-free organo-aluminum electrolytes in which a heatable treatment tank is closed off in an airtight manner and contains a rotatable electroplating drum with a first heatable tank for storing an aprotic oxygen-free and water-free organo-aluminum electrolyte and a second tank for storing a rinsing liquid connected to the treatment tank.

Apparatus and method for the electrodepositing of aluminum

Apparatus for electrodepositing aluminum in which an electroplating trough, which contains aprotic oxygen-free and water-free organo-aluminum electrolyte, is closed off in an airtight manner and is accessible only via a lock chamber disposed thereabove and which uses, for inserting and removing the work pieces, a detachable coupling rod carrying a frame with the articles to be electroplated permitting a strongly adhering aluminum layer to be deposited onto work pieces of any design desired with the exclusion of air.

Apparatus for electrodepositing aluminum

The invention provides an electroplating bath and a method for the electrodeposition of bright aluminum coatings on metals and conductive materials with aprotic oxygen- and water-free, organo-aluminum electrolytes which contain as a brightener at least one additive with at least one sulfonamide, sulfonimide and/or carbimide group. Particularly suitable brighteners are o-benzoic acid sulfonimide, N-benzoylbenzenesulfonamide and the reaction products of o-benzoic acid sulfonimide or N-benzoylbenzenesulfonamide with aluminum triethyl. Using the method, a fast-adhering and corrosion-resistant bright aluminum coating is obtained which finds use for decorative purposes and, generally, for corrosion protection in surface finishing, e.g., also as mirrors and reflectors for light and heat radiators.

Electroplating bath and method for the electrodeposition of bright

A method for pretreating the surfaces of electroconductive materials such as metals which are to be electroplated in an aprotic oxygen- and water-free organoaluminum electrolytic media in which the last mechanical operation generating fresh and bright surfaces is performed under the exclusion of air, oxygen, and moisture using a protective gas or protective liquid and the part being treated maintained in such an environment until electroplated.

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Nuremberg, Germany

Richard Dotzer