Surface treatment method for magnesium alloys and magnesium...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/78 (2006.01) C23C 22/12 (2006.01) C23C 22/18 (2006.01) C23C 22/34 (2006.01) C23C 22/44 (2006.01) C23C 22/73 (2006.01) C23F 1/22 (2006.01) C23F 1/40 (2006.01)

Patent

CA 2405288

The present invention provides a surface treatment method for magnesium alloys that can form a uniform, fine, and dense conversion coating on a magnesium alloy surface on which mold release agent, an oxide layer, and an alloying component (e.g., aluminum and zinc) segregation layer are potentially present, and also provides magnesium alloy members whose surface has been treated by the aforesaid surface treatment method. The surface treatment method of the present invention comprises a degreasing process to degrease the surface of the magnesium alloy, a chemically etching process to chemically etch the alloy, and a conversion treatment process to form a conversion coating. The chemical etching forms a magnesium phosphate coating having a coating weight of 10 to 2,000 mg/m2, measured as phosphorus, by bringing the surface of the magnesium alloy into contact with an aqueous solution containing a phosphoric acid-type compound.

L'invention concerne un procédé de traitement de surface destiné aux alliages de magnésium pouvant former par conversion un revêtement uniforme, fin et dense sur une surface d'un alliage de magnésium, un agent de démoulage, une couche d'oxyde et une couche de ségrégation de composant d'alliage (par exemple, aluminium et zinc) étant potentiellement présents sur celle-ci. L'invention concerne également des éléments d'alliage de magnésium dont les surfaces ont été traitées par le procédé de traitement de surface susmentionné. Ce procédé consiste en un processus de dégraissage destiné à dégraisser la surface d'un alliage de magnésium, un processus d'attaque chimique destiné à attaquer de manière chimique l'alliage, ainsi qu'un processus de traitement par conversion destiné à former le revêtement par conversion. L'attaque chimique forme un revêtement de phosphate magnésium possédant un poids de revêtement compris entre 10 et 2,000 mg/m?2¿, mesuré comme phosphore, par mise en contact de la surface de l'alliage de magnésium avec une solution aqueuse renfermant un composé du type acide phosphorique.

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