SOLUTION AND METHOD FOR SELECTIVELY STRIPPING ALLOYS CONTAINING NICKEL WITH GOLD, PHOSPHOROUS OR CHROMIUM FROM STAINLESS STEEL AND RELATED NICKEL BASE ALLOYS

摘要

A B S T R A C TImproved solutions are provided for selectively stripping alloys containingnickel with gold, phosphorous or chromium from substrates formed from alloyscontaining iron with chromium and in some instances nickel, or nickel rich,chromium bearing alloys, some of which also contain iron. These solutionscomprise concentrated nitric acid, at least one chloride salt, an organic corrosioninhibitor and optionally, an organic surface active agent. An improved methodutilizing the solutions of the invention is also provided and facilitates strippingof these alloys in substantially reduced time, without degradation of the underlyingsubstrate.