Inventors:
Frank A. Brindisi - Madison CT
Thomas W. Bleeks - New Haven CT
Thomas E. Sullivan - Hamden CT
Assignee:
Enthone, Incorporated - West Haven CT
International Classification:
C23F 100, C22B 700
Abstract:
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.