Method for the deposition of a chromium alloy

C - Chemistry – Metallurgy – 25 – D

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C25D 3/56 (2006.01) C25D 3/10 (2006.01)

Patent

CA 2396946

The invention relates to a method for the electrolytic coating of materials, in particular metallic materials, whereby a chromium alloy is deposited from an electrolyte, comprising at least chromic acid, sulphuric acid, an isopolyanion-forming metal, a short-chain aliphatic sulphonic acid, the salts and/or halo-derivatives thereof and fluorides. According to the invention, an alloy can be deposited, which can comprise a high proportion of isopolyanion-forming metal as a result of the combined addition of the short-chain aliphatic sulphonic acid with the fluorides and is nevertheless smooth and lustrous. In comparison with the alloy coatings known in the state of the art, in particular chrome/molybdenum alloys the above is a definite advantage. Furthermore, the presence of fluorides in particular leads to the above deposited coatings having a significantly higher hardness.

L'invention concerne un procédé de revêtement électrolytique de matériaux, en particulier de matériaux métalliques. Selon ce procédé, un alliage au chrome est déposé à partir d'un électrolyte, contenant au moins de l'acide chromique, de l'acide sulfurique, un métal formant des isopolyanions, un acide sulfurique aliphatique de chaîne courte, leurs sels et/ou leurs dérivés halogénés et des fluorures. La présente invention permet le dépôt d'un alliage pouvant présenter, par l'addition combinée de l'acide sulfurique aliphatique de chaîne courte aux fluorures, une proportion élevée de métal formant des isopolyanions, tout en étant lisse et brillant, ce qui est un avantage décisif par rapport aux couches d'alliage connus dans la technique antérieure, en particulier aux couches d'alliage au chrome-molybdène. En outre, par la présence de fluorures dans l'électrolyte, les couches déposées selon ladite invention présentent une dureté sensiblement supérieure.

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