A process for activating a metal surface for conversion coating

Details A process for activating a metal surface for conversion coating A process for activating a metal surface for conversion coating

C - Chemistry, Metallurgy

23

C

C23C 22/80 (2006.01) B01J 19/10 (2006.01)

Patent

CA 2175065

The invention is a process for applying a phosphate coating to a metal substrate in which the metal substrate is contacted with an aqueous activating bath before the phosphate coating is applied. The improved process is obtained by applying ultrasonic vibration energy to the aqueous activating bath. The ultrasonic energy can be applied to the aqueous activating bath when the aqueous activating bath is in contact with the metal substrate or when the metal substrate is not in contact with the aqueous activating bath.

L'invention concerne un procédé d'application d'un revêtement à base de phosphate sur un substrat métallique, ce procédé consistant à mettre en contact le substrat métallique avec un bain aqueux d'activation avant d'appliquer le revêtement à base de phosphate. Le procédé amélioré consiste à appliquer une énergie vibratoire ultrasonique au bain aqueux d'activation. L'énergie ultrasonique peut être appliquée au bain aqueux d'activation lorsque ce dernier est en contact avec le substrat métallique ou lorsque le substrat métallique n'est pas en contact avec le bain d'activation aqueux.

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