	US 12,480,220 B2
	Silver electrolyte for depositing dispersion silver layers and contact surfaces with dispersion silver layers
Andreas Stadler, Saaldorf-Surheim (DE); Robert Sottor, Frankfurt (DE); Reinhard Wagner, Seekirchen am Wallersee (AT); Christian Dandl, Fridolfing (DE); and Sebastian Heitmüller, Deggingen (DE)
Assigned to ROSENBERGER HOCHFREQENZTECHNIK GMBH & CO. KG, Fridolfing (DE); and DR.-ING. MAX SCHLOTTER GMBH & CO. KG, Geislingen/Steige (DE)
Appl. No. 17/251,258
Filed by Rosenberger Hochfrequenztechnik GmbH & Co. KG, Fridolfing (DE); and Dr.-Ing. Max Schlötter GmbH & Co. KG, Geislingen/Steige (DE)
PCT Filed Jun. 26, 2019, PCT No. PCT/DE2019/100597 § 371(c)(1), (2) Date Dec. 11, 2020, PCT Pub. No. WO2020/007408, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 102018005348.3 (DE), filed on Jul. 5, 2018.
Prior Publication US 2021/0254231 A1, Aug. 19, 2021
Int. Cl. C25D 3/46 (2006.01); B32B 5/16 (2006.01); C25D 5/12 (2006.01); C25D 7/00 (2006.01); C25D 7/06 (2006.01); C25D 15/00 (2006.01); C25D 17/08 (2006.01); C25D 5/34 (2006.01)

CPC C25D 3/46 (2013.01) [B32B 5/16 (2013.01); C25D 5/12 (2013.01); C25D 7/00 (2013.01); C25D 7/0614 (2013.01); C25D 15/00 (2013.01); C25D 17/08 (2013.01); B32B 2264/10 (2013.01); B32B 2264/102 (2013.01); B32B 2264/1023 (2020.08); B32B 2307/538 (2013.01); B32B 2457/00 (2013.01); C25D 5/34 (2013.01)]

11 Claims

1. A silver electrolyte for the deposition of silver layers on substrates comprising

a) potassium silver cyanide with a content of at least 50 g/L,

b) potassium cyanide with a content of at least 100 g/L,

c) at least one grain refiner with a content of 0.2 to 10 g/L,

d) at least one dispersant with a content of 1 to 10 g/L, and

e) at least one solid component with a content of 1 to 150 g/L,

wherein particles of the solid component have an average particle size (d₅₀) of 10 nm-100 μm; and

wherein the at least one grain refiner is selected from naphthalene sulphonic acid, naphthalene sulphonic acid derivatives or mixtures thereof;

wherein the at least one dispersant comprises alkyl sulfates having C₁-C₈alkyl groups which may be unsubstituted or optionally substituted; and

wherein the at least one solid component is graphite.