C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.2
C25D 5/10 (2006.01) C25D 5/48 (2006.01) C25D 15/02 (2006.01)
Patent
CA 1239372
- 24 - ABSTRACT A high lubricity codeposit of zinc and graphite, and an improved method for depositing the codeposit, is disclosed. The coating is characterized by a coefficient of friction equal to or less than .130, and a high resi- stance to corrosion evidenced by no red rust in a salt spray environment for 72 hours and no destruction due to corrosion in an industrial environment, containing sulphur dioxide, for four months. When the codeposit additionally has a chromate outer coating, the system has a coefficient of friction equal to or less than .112 and has no red rust in a salt spray environment for at least 120 hours. The codeposit is applied by immersing a cleansed metallic substrate in an acidic zinc plating electrolyte containing at least 40 g/l zinc ions and 30-110 g/1 insoluble bulk graphite, with a pH of 5-5.7. The cell of which the electrolyte is a part is energized to plate out a co- deposit; the graphite is continuously agitated while in solution, the agitation being periodically interrupted to allow the graphite to settle and saturate the zinc inter- face as it is plating out.
438290
Donakowski William A.
Morgan John R.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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