Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Reexamination Certificate
2005-05-03
2005-05-03
King, Roy (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
C148S261000, C148S275000, C106S014120, C252S389540
Reexamination Certificate
active
06887320
ABSTRACT:
The present invention relates to a process for forming a chromate-free, corrosion resistant coating on a product formed from magnesium or a magnesium alloy and to a solution used for forming the coating. The solution has phosphate and fluoride ions and contains from 1.0 g/l to 5.0 g/l of an active corrosion inhibitor selected from the group consisting potassium permanganate, sodium tungstate, sodium vanadate, and mixtures thereof. The solution may also containing from 0.1 to 1.0 vol % of a surfactant which reduces reaction time. The solution is maintained at a temperature of 120 to 200 degrees Fahrenheit and has a pH of 5 to 7. The process for forming the coating broadly comprises degreasing the magnesium or magnesium alloy product in a degreasing solution, cleaning the product in a highly alkaline cleaning solution, deoxidizing the product in a deoxidizing solution, and immersing the product in the coating solution for a time period of 15 minutes to 90 minutes.
REFERENCES:
patent: 5520750 (1996-05-01), Riley
patent: 5683522 (1997-11-01), Joesten
patent: 2001123274 (2001-05-01), None
Briles Owen M.
Jaworowski Mark
Kryzman Michael A.
Bachman & LaPointe P.C.
Hamilton Sundstrand Corporation
King Roy
United Technologies Corporation
Zhang Lois
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