Method of anodizing of magnesium and magnesium alloys and producing conductive layers on an anodized surface
AssigneeAlonim Holding Agricultural Cooperative Society Ltd.
InventorIlya Ostrovsky
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Abstract
A method, a composition and a method for making the composition for anodizing metal surfaces, especially magnesium surfaces is disclosed. The composition is a basic aqueous solution including hydroxylamine, phosphate anions and nonionic surfactants. A complementary method, composition and method for making the composition for rendering an anodized metal surface, especially a magnesium surface, conductive is disclosed. The composition is a basic aqueous solution including bivalent nickel, pyrophosphate anions, sodium hypophosphite and either ammonium thiocyanate or lead nitrate.
Claims49
A method of treating a workpiece comprising:
- a. providing a surface, said surface chosen from the group consisting of magnesium, magnesium alloys, titanium, titanium alloys, beryllium, beryllium alloys, aluminum and aluminum alloys;
- b. immersing said surface in an anodizing solution;
- c. providing a cathode in said anodizing solution;
- and
- d. passing a current between said surface and said cathode through said anodizing solution
- wherein said anodizing solution is substantially an aqueous solution with a pH greater than 8 and includes:
- i. hydroxylamine;
- ii. phosphate anions;
- iii. a nonionic surfactant;
- and
- iv. an alkali metal hydroxide.
A composition useful for anodization of a magnesium or magnesium alloy surface comprising:
- a. hydroxylamine;
- b. phosphate anions;
- c. nonionic surfactant;
- d. alkali metal hydroxide;
- and
- e. water
- wherein a pH of the composition is greater than about 8.
A method for the preparation of a solution useful for the treating of a magnesium or magnesium alloy surface comprising:
- a. providing hydroxylamine;
- b. providing phosphate anions;
- c. providing a nonionic surfactant;
- d. mixing said hydroxylamine, said phosphate anions and said nonionic surfactant with water to make a solution;
- and
- e. adjusting a pH of said solution so as to be greater than about 8.
Dependencies are inferred from the claim text.