Chemical milling process and solution for cast titanium alloys
AssigneeUnited Technologies Corporation
InventorsJames O. Hansen, Kenneth C. Long, Michael A. Jackson, Henry M. Hodgens
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Abstract
The present invention relates to a chemical milling solution and a chemical milling process for removing a desired depth of material from metal parts. The milling solution contains nitric acid, hydrofluoric acid, a wetting agent, such as a surfactant, dissolved titanium, and the balance water. The solution is maintained at a temperature in the range of from about 110° F. to about 130° F. The metal part to be milled is immersed in the milling solution for a time sufficient to remove a desired depth of material from at least one surface of the part.
Claims28
A process for chemically milling a metal part without causing significant intergranular attack comprising the steps of:
- providing a milling solution containing nitric acid, hydrofluoric acid, dissolved titanium, a wetting agent, and water;
- maintaining said milling solution at a temperature in the range of from about 110 to 130° F.;
- and
- immersing said metal part into said milling solution for a time sufficient to mill a desired depth on at least one surface of said part.
A chemical milling solution comprising nitric acid, hydrofluoric acid, a wetting agent, a quantity of dissolved titanium, and the balance water.
Dependencies are inferred from the claim text.