Patent ID: 6280598
Filing Date: 2001-08-28
Classification: C25D

Abstract:
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.degree. C. to 90.degree. 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; andpassing a current between the anode and cathode through said solution so that a coating is formed on said material.