Solution and method for selectively stripping alloys containing

Details Solution and method for selectively stripping alloys containing Solution and method for selectively stripping alloys containing

1980-01-03

1981-11-24

Powell, William A.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

134 3, 156656, 156664, 156637, 252 794, 252146, 252364, C23F 100, C22B 700

Patent

active

043022464

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.

REFERENCES:
patent: 2200486 (1940-05-01), Burdick
patent: 3125475 (1964-03-01), Livingston et al.

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