Method for forming a lubricative film for cold working

Details Method for forming a lubricative film for cold working Method for forming a lubricative film for cold working

C - Chemistry, Metallurgy

25

D

C25D 11/36 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2343779

A phosphate conversion coating of 6 to 20 g/m2 is formed on a metal substrate, using an electrolytic solution containing zinc ions, phosphate ions, and an auxiliary acid, preferably nitric acid, and passing an electric current, with the substrate serving as the cathode, for a few seconds through the substrate, the electrolyte solution, and a counterelectrode. This provides a method for forming a lubricative film suitable for cold working without generating any sludge and at a high level of productivity. Lubrication performance may be checked by means of a backward punching test. The dies (2) are set to bind the circumference of the cylindrical test specimen (1) and the specimen is then subjected to a downward stroke from a punch (3).

Pour former sur un substrat métallique un revêtement de phosphate par conversion pesant de 6 à 20 g/m?2¿, on utilise une solution d'électrolyte contenant des ions de zinc, des ions de phosphate et un acide auxiliaire, de préférence de l'acide nitrique, puis, en utilisant le substrat comme cathode, on fait passer, pendant quelques secondes, un courant électrique à travers le substrat, la solution d'électrolyte, et une contre-électrode. On obtient ainsi un procédé permettant de former un film lubrifiant adapté au travail à froid à un taux de productivité élevé, sans produire de dépôt. La performance de lubrification peut être testée au moyen d'un poinçonnage avec retour. Les matrices (2) sont réglées de façon qu'elles serrent la circonférence du spécimen de test (1), lequel est ensuite soumis à un poinçonnage descendant au moyen d'un poinçon (3).

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