Abrégé

An electrode device for electrochemical workpiece machining, for example an electropolishing or electroplating process, comprises an electrode and a power supply cable that is connected to the electrode and has an electrical conductor and a multilayer cladding structure around the electrical conductor. In one embodiment, the cladding structure comprises a helical wire for transmitting shear forces via the power supply cable and a fabric hose fitted closely around the helical wire. The helical wire prevents any narrowing of the diameter of the fabric hose and consequently any longitudinal extension of the fabric hose, for which reason the latter can be used to transmit tensile forces via the power supply cable. Around the outside of the fabric hose, the power supply cable has an electrically insulating plastics sheath.

Classes IPC  ?

• C25D 5/04 - Dépôt avec électrodes mobiles
• C25D 17/10 - Électrodes
• C25F 7/00 - Éléments de construction des cellules, ou leur assemblage, pour l'enlèvement électrolytique de matières d'objetsEntretien ou conduite
• C25D 7/04 - TubesAnneauxCorps creux
• C25D 17/12 - Forme ou configuration

Abrégé

The invention relates to a method for the wet-chemical polishing of molded zinc parts, the molded parts being brought in contact with an acid solution and said acid solution containing only sulfuric acid and phosphoric acid as the strong acids.

Classes IPC  ?

• C09G 1/04 - Dispersion aqueuse
• C09K 13/04 - Compositions pour l'attaque chimique, la gravure, le brillantage de surface ou le décapage contenant un acide inorganique
• C23F 1/16 - Compositions acides
• C23G 1/02 - Nettoyage ou décapage de matériaux métalliques au moyen de solutions ou de sels fondus avec des solutions acides
• C23F 3/06 - Métaux lourds par des solutions acides

Abrégé

The invention relates to an electrolyte that is suitable for electropolishing stainless steels. In particular, the invention relates to the use of certain additives to said electrolyte in order to decrease the processing time of materials until a certain polishing quality is achieved and/or to reduce the minimum current density for achieving a polishing effect. The electrolyte contains a pyridinecarboxylic acid.

Classes IPC  ?

• C25F 3/24 - Polissage des métaux lourds du fer ou de l'acier

Abrégé

The present invention relates to a method for the production of colored stainless steel surfaces having a high resistance and a wide application spectrum, and to articles comprising such stainless steel surfaces.

Classes IPC  ?

• C23C 18/12 - Revêtement chimique par décomposition soit de composés liquides, soit de solutions des composés constituant le revêtement, ne laissant pas de produits de réaction du matériau de la surface dans le revêtementDépôt par contact par décomposition thermique caractérisée par le dépôt sur des matériaux inorganiques, autres que des matériaux métalliques

Abrégé

The present invention relates to a method for the surface treatment of Corten steel, in particular comprising the steps of cleaning, activating, dyeing and sealing the surface. The invention also relates to Corten steels, produced by the method according to the invention.

Classes IPC  ?

• C23C 22/68 - Traitement chimique de surface de matériaux métalliques par réaction de la surface avec un milieu réactif laissant des produits de réaction du matériau de la surface dans le revêtement, p. ex. revêtement par conversion, passivation des métaux au moyen de solutions aqueuses au moyen de solutions aqueuses avec un pH compris entre 6 et 8
• C23C 22/78 - Pré-traitement du matériau à revêtir
• C23C 22/83 - Post-traitement chimique
• C23G 1/08 - Fer ou acier
• C23C 28/04 - Revêtements uniquement de matériaux inorganiques non métalliques

Abrégé

The invention relates to a process for the surface treatment of high-grade steel alloys and microstructures, said process comprising two process steps wherein the first process step has a pre-treatment or activation step, and the second process step is a pickling process. A solution containing hydrofluoric acid is used in both process steps.

Classes IPC  ?

• C23G 1/00 - Nettoyage ou décapage de matériaux métalliques au moyen de solutions ou de sels fondus
• C23G 1/08 - Fer ou acier
• C23G 1/36 - Régénération des liqueurs de décapage usées

Abrégé

A method for the surface treatment of stainless steel is described, wherein thermal oxide layers are brought into contact with a composition which dissolves iron ions out of the oxide layers.

Classes IPC  ?

• C23G 1/08 - Fer ou acier
• C23G 1/32 - Métaux lourds
• C23C 22/50 - Traitement du fer ou des alliages à base de fer

Abrégé

The present invention relates to a method for improving the temperature and corrosion resistance of stainless steel using a novel passivation method. This method comprises a chemical treatment with an aqueous solution, which has a complexing agent combination and at least one oxidizing agent, a subsequent rinsing, and a subsequent treatment at an elevated temperature in an oxygenic atmosphere. The stainless steel surfaces obtained according to the invention have a homogeneous passive layer with increased chemical resistance and resilience to thermal discoloration.

Classes IPC  ?

• C23C 22/50 - Traitement du fer ou des alliages à base de fer
• C23C 22/82 - Post-traitement