Patents Assigned to Torcad Limited
  • Process for improving corrosion resistance of zinc or cadmium plated metal articles
    Patent number: 4657599
    Abstract: A process for improving corrosion resistance of a metal article plated with zinc or cadmium includes coating the plated article with a chromium solution to provide the article with a chromate coating having a yellow to olive-drab color, and immersing the chromated article in a silicate solution for a sufficient time to cause the article to assume an acceptable white or grey color and also increase its corrosion resistance.
    Type: Grant
    Filed: October 21, 1985
    Date of Patent: April 14, 1987
    Assignee: Torcad Limited
    Inventor: James A. Sutherland