C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/21
C25D 3/56 (2006.01) C25D 5/48 (2006.01)
Patent
CA 1255618
TITLE SOLDERABLE PALLADIUM-NICKEL COATINGS ABSTRACT A permanently solderable palladium-nickel electroplated coating is formed on electrically conductive surfaces. The coating has a first alloy layer of 46 to 82 atomic percent palladium and 18 to 54 atomic percent nickel. This first layer is covered by a continuous second layer of 96 to 100 atomic percent metallic palladium and 0-4 atomic percent nickel. A process is disclosed for obtaining a permanently solderable palladium-nickel coating on an electrically conductive substrate comprising immersing the substrate in an electroplating bath consisting of 1) palladium II ammine chloride, 2) nickel ammine sulfate or nickel chloride, 3) a brightener selected from the group consisting of sodium vinyl sulfonate, sodium allyl sulfonate and quaternized pyridine and 4) ammonium sulfate or chloride, to form a plated surface and thereafter immersing the plated surface in a static aqueous solution of sulfuric or hydrochloric acid.
463708
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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