Method and apparatus for electrolytically metallising or...

C - Chemistry – Metallurgy – 25 – D

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C25D 5/06 (2006.01) C25D 17/14 (2006.01) H05K 3/24 (2006.01)

Patent

CA 2176579

The current density with which the process is used is of essential importance for the economy of a method of electrolytically treating materials. Normally only low or medium current densities are used, as the speed of replacement of consumed materials in the direct vicinity of the surface of the material for treatment has a restrictive effect on the magnitude of the current density at which a usable process result can still be achieved. However, a low current density leads to long electrolysis times and to complex treatment installations. The opportunity afforded according to the invention of improving the transfer of materials at the surface of the material for treatment consists in generating a large flow of electrolyte at the treatment point by means of rotating electrodes which are movable synchronously with the surfaces of the material for treatment, and which may be electrically polarised with respect to the material for treatment, out of which the treatment agent emerges through openings, or into which it is sucked through openings.

La densité de courant utilisée lors de la mise en oeuvre du procédé est déterminante pour le rapport coût-efficacité d'un procédé de traitement électrolytique de pièces. De manière générale, on n'utilise que des densités de courant basses ou moyennes, dans la mesure où la vitesse à laquelle le volume des substances consommées est complété au voisinage immédiat de la surface des articles traités est limitée pour la valeur de la densité de courant, valeur permettant encore d'obtenir un résultat utile. Une faible densité de courant entraîne cependant de longues périodes d'électrolyse et des installations de traitement coûteuses. Selon l'invention, il est prévu d'améliorer le transport de substances à la surface des articles à traiter, par production d'un courant d'électrolyte élevé au point de traitement, à l'aide d'électrodes (9) rotatives se déplaçant de manière synchrone à la surface des articles à traiter et pouvant être polarisées électriquement par rapport aux articles traités. L'agent de traitement sort des électrodes (9) ou bien y est aspiré, par des ouvertures (16).

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