Method of maintaining constant concentrations of substances...

C - Chemistry – Metallurgy – 25 – D

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C25D 21/14 (2006.01) C25D 21/18 (2006.01)

Patent

CA 2241659

The invention relates to a method for maintaining constant concentrations of substances contained in an electrolytic treatment bath, preferably in baths with aqueous solutions. In order to regenerate the continual depletion of chemicals, substance concentrates are added to the baths according to known methods. The rapid increase in concentrations of damaging substances in the processing solution is disadvantageous. In order to reduce this build-up, a further metering method is known, namely the continuous replacement of bath solution by creating a bath overflow. The addition of bath solution with the bath concentration is balanced out by the overflow. As a consequence of evaporation and entrainment this method also leads to the fact that the operating concentration cannot be maintained for a long period of time in chemically critical baths. With the invention, this problem is resolved by continuous or intermittent removal of bath solution in a defined quantity and addition of fresh bath solution preferably in the same quantity. The changes in the concentrations of substances in the bath occurring through evaporation and entrainment are compensated for completely independently of the metering.

L'invention concerne un procédé de maintien de concentrations constantes de substances contenues dans un bain de traitement galvanoplastique, de préférence dans des bains contenant des solutions aqueuses. Dans les procédés connus, on ajoute des substances concentrées aux bains pour compenser la consommation continue de produits chimiques, ce qui a pour inconvénient d'augmenter rapidement les concentrations de substances indésirables dans la solution utilisée. Pour réduire cette surconcentration, on utilise une autre méthode de dosage, connue sous l'appellation de remplacement continu de solution de bain par formation d'une surverse. L'adjonction de la solution de bain à la concentration du bain est compensée par la surverse. L'évaporation et l'entraînement font qu'avec ce procédé, dans le cas de bains critiques sur le plan chimique, la concentraion de travail ne peut être maintenue à long terme. Cette invention permet de résoudre ce problème par soutirage continu ou discontinu d'une quantité définie de solution de bain et par adjonction d'une quantité, de préférence égale, de solution de bain fraîche. Les modifications des concentrations des substances du bain dues à l'évaporation et à l'entraînement sont entièrement compensées indépendamment du dosage.

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