US 11,913,131 B2
Ternary zinc-nickel-iron alloys and alkaline electrolytes or plating such alloys
George Bokisa, North Olmsted, OH (US); Tony Oriti, Brooklyn Heights, OH (US); and Markus Jahn, Brooklyn Heights, OH (US)
Assigned to MacDermid, Incorporated, Waterbury, CT (US)
Appl. No. 16/302,454
Filed by Coventya, Inc., Brooklyn Heights, OH (US)
PCT Filed May 24, 2017, PCT No. PCT/US2017/034186
§ 371(c)(1), (2) Date Nov. 16, 2018,
PCT Pub. No. WO2017/205473, PCT Pub. Date Nov. 30, 2017.
Claims priority of provisional application 62/340,759, filed on May 24, 2016.
Prior Publication US 2020/0071843 A1, Mar. 5, 2020
Int. Cl. C25D 3/56 (2006.01); B32B 15/01 (2006.01); C22C 18/00 (2006.01); C23C 22/53 (2006.01); C25D 5/48 (2006.01); H01R 13/03 (2006.01)
CPC C25D 3/565 (2013.01) [B32B 15/017 (2013.01); C22C 18/00 (2013.01); C23C 22/53 (2013.01); C25D 5/48 (2013.01); H01R 13/03 (2013.01); C23C 2222/10 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An aqueous alkaline zinc-nickel-iron electroplating bath for depositing a ternary zinc-nickel-iron alloy on a substrate, the aqueous alkaline zinc-nickel-iron electroplating bath comprising:
zinc ions,
nickel ions,
an alkaline compound selected from the group consisting of sodium hydroxide and potassium hydroxide, and
a complex consisting of an iron salt and an iron complexing agent, wherein the iron complexing agent is selected from the group consisting of sodium gluconate, sodium tartrate, sodium hydroxybutyrate, potassium gluconate, potassium tartrate, and/or potassium hydroxybutyrate, and wherein the complex is formed prior to addition to the electroplating bath,
wherein a concentration of iron ions in the electroplating bath provided by the complex is from about 0.1 gram per liter to about 25 grams per liter,
wherein the electroplating bath is maintained at a pH of more than about 13
wherein the electroplating bath is configured to deposit a ternary zinc-nickel-iron alloy containing 7 to 16 wt. % nickel, 0.5 to 8.0 wt. % iron, and the balance zinc, and
wherein the electroplating bath is at least essentially free of iron hydroxide.