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AssigneeEnthone Inc.
InventorsFrank A. Brindisi, Jr., Thomas W. Bleeks, Thomas E. Sullivan
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Improved solutions are provided for selectively stripping alloys containing nickel with gold, phosphorous or chromium from substrates formed from alloys containing iron with chromium and in some instances nickel, or nickle rich, chromium bearing alloys, some of which also contain iron. These solutions comprise concentrated nitric acid, at least one chloride salt, an organic corrosion inhibitor and, optionally, an organic surface active agent. An improved method utilizing the solutions of the invention is also provided and facilitates stripping of these alloys in substantially reduced time, without degradation of the underlying substrate.
An improved solution for selectively stripping an alloy containing nickel with gold, phosphorous or chromium from substrates formed from alloys containing iron with chromium alone or with nickel, or nickel rich, chromium bearing alloys, said solution comprising:
An improved solution for selectively stripping gold/nickel brazing alloys from a substrate formed from 300 or 400 series Stainless Steels, Hastelloy, Inconel or equivalent alloys, said solution comprising:
An improved solution for selectively stripping gold/nickel, nickel/phosphorous or nickel/chromium alloy from a substrate formed from 300 or 400 series Stainless Steels, Hastelloy, Inconel or equivalent alloys, said solution comprising nitric acid in a concentration ranging from about 40% to 72% by weight, potassium ion in a concentration ranging from 7.5 to 15 grams per liter of nitric acid, chloride ions ranging between about 15 to 27.5 grams per liter of nitric acid, ferric ion in a concentration ranging from about 3.75 to 15.0 grams per liter of nitric acid, an acetylenic alcohol ranging from about 1.0 to 3.0 grams per liter of nitric acid, and a polyethoxylated amine or diamine ranging from about 1.0 to 3.0 grams per liter of nitric acid.
An improved method for selectively removing gold/nickel, nickel/phosphorous or nickel/chromium alloy from substrates formed from 300 or 400 series Stainless Steels, Hastelloy, Inconel or equivalent alloys, said method comprising the steps of:
Dependencies are inferred from the claim text.