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US 6,280,598 B1Granted
Anodization of magnesium and magnesium based alloys
AssigneeMagnesium Technology Limited
InventorsThomas Francis Barton, John Arnold Macculloch, Philip Nicholas Ross
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Abstract
This invention provides a method for the anodization of magnesium or magnesium based alloys using an electrolytic solution containing ammonia, amines or both. The use of such an aqueous electrolytic solution in at least preferred forms alters the conditions under which anodization can occur to provide a more than satisfactory coating on the magnesium material with reduced cycle times.
Claims17
A method for the anodization of magnesium based materials comprising:
- a first pre-treatment step including at least one of the following:
- (A) immersion of the material in a mixture of sodium tetraborate and sodium pyrophosphate solution at 70° C. to 90° C. for approximately at least five minutes;
- (B) immersion of the material in 35% hydrofluoric acid v/v at ambient temperature for at least approximately one minute;
- or
- (C) immersion of the material in a one to one mixture of 35% hydrofluoric acid w/w and 68% nitric acid w/v for at least approximately one minutes;
- providing an electrolytic solution comprising 1% to 33% w/v of ammonia, an amine, or a mixture thereof;
- providing a cathode in said solution;
- placing the magnesium based material as an anode in said solution;
- and
- passing a current between the anode and cathode through said solution so that a coating is formed on said material.
7 more elements
Dependencies are inferred from the claim text.