Back to results
US 5,290,362 AGranted
Striping process for stripping compounds of titanium from base metals
AssigneePraxair S.T. Technology, Inc.
InventorJiinjen A. Sue
Life of this patent
Estimating the term…
Abstract
An aqueous stripping solution and method for selectively removing a titanium compound from a base metal. The aqueous solution contains a source of hydrogen peroxide, an alkali source of hydroxyl ions and an acid with the components in a concentration such that the pH of the solution is above 8.
Claims9
A process for stripping a coating of a titanium compound selected from the group consisting of titanium nitride compounds and titanium boride compounds from a base metal of a super alloy, stainless steel or alloy steel without suffering chemical attack to the base metal comprising the steps of:
- immersing the base metal and coating into an aqueous solution containing hydrogen peroxide or a compound which dissociated into hydrogen peroxide in water, an alkali source of hydroxyl ions, and an acid, maintaining the solution temperature between about 25.degree. C. and 85.degree. C. and maintaining the pH of the aqueous solution at a pH of above at least 8.
Dependencies are inferred from the claim text.