Abstract: A method for anodizing a part made of aluminum or an aluminum alloy by immersing the part in an aqueous bath essentially comprising sulfuric acid at a concentration of 150 to 250 g/L and at a temperature of 5 to 25° C. A DC voltage according to a voltage profile comprising a voltage increased at a rate of 1 to 32 V/min is applied to the part. The voltage is maintained at a plateau voltage value of 12 to 20 V for a duration sufficient for obtaining, at the surface of the part, an anode layer having a thickness of 3 to 7 ?m and/or a layer weight of 20 to 150 mg/dm2.
Type:
Grant
Filed:
February 11, 2013
Date of Patent:
January 30, 2018
Assignee:
MECAPROTEC INDUSTRIES
Inventors:
Pierre Bares, Celine Gazeau, Cedric Stephan, David Pedelmas, Claude Rossignol, Sylvain Bruet, Olivier Brucelle, Paul Dedieu, Philippe Combes, Laurent Arurault, Viviane Turq, Jean-Jacques Rousse, Kevin Klepman
Abstract: A method for surface treatment of a part made of aluminum, magnesium, or one of the alloys thereof, to protect the part from corrosion. The method comprises consecutively immersing the part in a first aqueous bath containing a corrosion-inhibiting metal salt and an oxidizing compound, and a second aqueous bath containing an oxidizing compound and a corrosion-inhibiting rare-earth salt. The method can be carried out for the chemical conversion of aluminum or the alloys thereof, and of magnesium or the alloys thereof, on parts that have not been previously treated, or after anodizing the part to seal the anodic layer.
Type:
Grant
Filed:
February 11, 2013
Date of Patent:
January 30, 2018
Assignee:
MECAPROTEC INDUSTRIES
Inventors:
Pierre Bares, Cedric Stephan, Celine Gazeau
Abstract: A method for surface treatment of a part made of aluminum, magnesium, or one of the alloys thereof, to protect the part from corrosion. The method comprises consecutively immersing the part in a first aqueous bath containing a corrosion-inhibiting metal salt and an oxidizing compound, and a second aqueous bath containing an oxidizing compound and a corrosion-inhibiting rare-earth salt. The method can be carried out for the chemical conversion of aluminum or the alloys thereof, and of magnesium or the alloys thereof, on parts that have not been previously treated, or after anodizing the part to seal the anodic layer.
Type:
Application
Filed:
February 11, 2013
Publication date:
January 22, 2015
Applicant:
MECAPROTEC INDUSTRIES
Inventors:
Pierre Bares, Cedric Stephan, Celine Gazeau