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Process for currentless separation of a nickel layer from objects of light metal

  • US 4,025,358 A
  • Filed: 10/01/1975
  • Issued: 05/24/1977
  • Est. Priority Date: 10/11/1974
  • Status: Expired due to Term
First Claim
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1. Process for currentless separation of a nickel layer from the inner surfaces of ring-shaped objects of light metal comprising:

  • stacking the objects one on another with interposition of annular packings between adjacent stacked objects and clamping the objects together to form a sealed interior chamber, introducing into the chamber a bath containing nitric acid, water at 70°

    to 80°

    C. and metallic copper in amounts effective to dissolve the nickel layer with the nitric acid reacting with the nickel and the copper, the reaction gases escaping from the chamber and the bath being discharged from the chamber upon termination of the reaction.

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