Siemens Aktiengesellschaft

Aluminal Oberflachentechnik Gmbh

Aluminal Oberflachentechnik Gmbh & Co. Kg

Hans De Vries

Siegfried Birkle

Klaus Stoger

Johann Gehring

Klaus Stoeger

Matthias Hartel

Jorg Heller

J&ouml;rg Heller

The invention concerns a method for electrolytic coating of materials with aluminum, magnesium or aluminum and magnesium alloys. The method is characterized in that the material is pretreated by being immersed in an electrolytic solution, where it is anodized, the electrolytic coating being performed immediately after in the same electrolytic solution.

Method for electrolytic coating of materials with aluminum, magnesium or aluminum and magnesium alloys

Method for electroplating metallic and non-metallic endless products and device for carrying out said method

Electrolytic high-speed deposition of aluminum on continuous products

Aluminized parts are anodized in an aqueous bath which contains 1050 to 1040 g per L of sulfuric acid with a density of 1.84 and optionally 1 to 100 g of a polyhydroxy alcohol and 1 to 100 g of a multibasic organic acid. The anodizing is carried out at a pH value of less than 1 with a current density of 0.5 to 3 A/dm.sup.2 at 0.degree. to 30.degree. C. The method can be used with partially aluminized parts without destroying the base material.

Bath and method for anodizing aluminized parts

Aluminum materials and aluminized parts are oxidatively anodized at a bath temperature of 0.degree. to 15.degree. C. and preferably, 0.degree. to 10.degree. C. to produce an anodized layer of aluminum oxide more than 4 microns thick, which is hard, abrasion-proof and can be stained. The anodizing is bath used while conducting air free of or low in carbon dioxide through the bath. It is free of substances which limit the oxide layer to maximally a thickness of about 1 micron (forming layer) and contains 10 to 500 g trisodium phosphate or tripotassium phosphate per liter. In partially aluminized parts, no destruction of the base material occurs during the aluminizing.

Method for anodizing aluminum materials and aluminized parts

In a tank of aluminizing electroplating cells which may contain racks for articles, operated with aprotic oxygen-free and water-free organo-aluminum electrolytes, a lining of individual segments coated with resistant materials (enamel or electrolyte-resistant plastics) is provided as an electrically insulating protective device. The outer edges of the side baffles, coated all around, are bent round toward the outside and are held together by connecting straps which are bent round toward the inside. The individual bottom segments coated all around lie on top of each other overlapping in roof tile fashion. The protective device may also include a similarly insulated band arranged all around the cell.

Electrically insulating protective device

A device for continuously processing an article such as by electroplating including a tank equipped with a horizontally disposed rotating electroplating drum, an entry station disposed for introducing an article to one end of the drum and an exit station for removing the processed article from the drum. The electroplating tank as well as the entrance and exit stations are provided with gas-tight seals so that the device may be utilized for an oxygen-free and water-free aluminum-organic electrolyte for the electrodeposition of aluminum. Preferably, the entrance and exit stations contain liquid locks to prevent the controlled atmosphere above the electrolyte from being contaminated.

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Heerde, Netherlands

Hans De Vries