Method for passivating stainless steel product and method...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/62 (2006.01) H01M 8/02 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2497404

A method for passivating stainless steel product, which comprises immersing a press-formed material in a treating solution having a temperature of 40 to 60°C and a pH of 9 to 12, to form a passivated coating film on the surface of the material, or alternatively which comprises carrying out degreasing, washing and the passivation treatment using the above treating solution by means of a spraying method. The passivation treatment by the method is free from the elution of a metal ion from the material and allows the achievement of passivation by the use of a single treating solution, resulting in the reduction of a passivation cost including a waste treatment cost, and the latter method allows degreasing, washing and a passivation treatment to be speeded and to be practiced with a reduced amount of treating solutions, due to the employment of a splaying process.

L'invention concerne un procédé qui permet de passiver un produit en acier inoxydable qui consiste à immerger un matériau formé sous pression (11) dans une solution (12) présentant une température variant entre 40 et 60 ·C et un pH variant entre 9 et 12 afin de former un film de revêtement passivé (26) sur la surface du matériau ou qui, dans une variante, consiste à procéder à un dégraissage, à un lavage et à un traitement de passivation en faisant appel à la solution de traitement mentionnée plus haut au moyen d'un procédé de pulvérisation. Ce traitement de passivation ne comprend pas l'élution d'un ion métallique du matériau et permet de réaliser la passivation à l'aide d'une seule solution de traitement, ce qui donne lieu à la réduction du coût de passivation, notamment le coût de traitement des résidus. De plus, ce procédé permet d'accélérer le dégraissage, le lavage et le traitement de passivation et de réaliser ces étapes avec un taux réduit de solutions de traitement, grâce à l'utilisation d'un procédé de pulvérisation.

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