Process for the galvanic application of a surface coating

Details Process for the galvanic application of a surface coating Process for the galvanic application of a surface coating

C - Chemistry, Metallurgy

25

D

C25D 5/18 (2006.01) B08B 17/06 (2006.01)

Patent

CA 2172613

The invention relates to a galvanic coating process to provide a structured surface coating on a workpiece with an electrically conductive surface and a device for implementing the process. Here, the object to be coated is the cathode in a galvanic bath. The process current is raised in steps during a nucleation phase (10, 11) in which the stepwise increase in the current results in the formation of a deposit of individual or adjacent bodies on the surface of the object. The prooess current is then kept constant during a ramp working period (12), resulting in the growth of the previously produced nuclei or bodies. The process may be cyclically repeated.

L'invention concerne un procédé d'application d'un revêtement par galvanisation pour créer un revêtement superficiel structuré sur une pièce à surface électroconductrice. L'invention concerne également un dispositif permettant de mettre le procédé en oeuvre. L'objet à recouvrir constitue la cathode immergée dans un bain électrolytique. Le courant du processus est augmenté progressivement dans une phase de germination (10, 11), ce qui entraîne la formation d'un dépôt de corps individuels ou adjacents sur la surface de l'objet. Le courant du processus est ensuite maintenu constant pendant un temps de travail en rampe (12), ce qui permet la croissance des germes ou des corps produits précédemment. Cette opération peut être répétée de manière cyclique.

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