C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.95
C25D 11/38 (2006.01) C23C 22/24 (2006.01) C25D 5/48 (2006.01)
Patent
CA 1209947
ABSTRACT OF THE DISCLOSURE The present invention includes an aqueous acidic chromate solution, suitable for forming colored chromate coatings on zinc-nickel alloy electrodeposits containing up to about 15% by weight nickel, which solutions have a pH within the range of about 1.3 to about 2.7, a hexavalent chromium concentration of at least 0.5 grams per liter, and preferably about 0.5 to 100 grams per liter, and which con- tain sulfate in a weight ratio of SO4:Cr+6 of about 0.025- 1.5:1. The zinc-nickel alloy electrodeposits are preferably immersed in the chromating solution for a period sufficient to form the desired colored chromate coating. Alterna- tively, the zinc-nickel alloy electrodeposit may be immer- sed in the chromating solution and the solution electroly- zed, with the zinc-nickel alloy surface as the anode, at low current densities for a short period of time, after which, the electrolysis is discontinued and the zinc-nickel alloy surface is maintained in the chromating solution until the desired colored chromate film is formed.
419161
Kamitani Masaaki
Tsuji Hidenori
Ebara-Udylite Company Limited
Marks & Clerk
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