Magnesium conversion coating composition and method of using same
OwnerJon Bengston, Mark Wojtaszek +2inventors
InventorsJon Bengston, Mark Wojtaszek, Gerald Wojcik, Massimo Dimarco
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Abstract
A conversion coating composition and a method of applying the conversion coating composition to magnesium and magnesium alloy articles prior to painting to prevent corrosion. The conversion coating composition comprises a source of vanadate ions, a material comprising phosphorus, and nitric acid or a source of nitrate ions. In addition, the composition may also contain boric acid or a source of borate ions and a source of fluoride ions or a source of fluoroborate ions.
Claims45
A magnesium conversion coating composition comprising:
- a) a source of vanadate ions;
- b) a material comprising phosphorus;
- and
- c) a source of nitrate ions;
- wherein the vanadate ions, phosphorus material, and nitrate ions are dissolved in an aqueous solution, and the pH of the composition is between 1 and 4.
A method of applying a magnesium conversion coating to magnesium or magnesium alloy substrates comprising the steps of:
- a) cleaning said magnesium or magnesium alloy substrates by immersing the substrates in an alkaline cleaning bath;
- b) rinsing the cleaned substrates with water;
- c) immersing said substrates in an aqueous conversion coating composition comprising a source of vanadate ions, a material comprising phosphate, and a source of nitrate ions, to form a conversion coating on a surface of said magnesium or magnesium alloy substrates;
- and
- d) rinsing said substrates with water for a period of 5 minutes to dissolve surface smut on said surface of said substrates.
Dependencies are inferred from the claim text.