Dispersion electrolyte for graphite-containing layers
AssigneeDr.-Ing. Max Schlotter GmbH & Co. KG
InventorsThomas Pliet, Stefan Henne, Michael Neiffer, Vera Lipp
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Abstract
The invention relates to a dispersion electrolyte for the electrodeposition of graphite-containing tin, nickel or tin-nickel layers, to a method for the electrodeposition of such a graphite-containing layer, to a metal substrate coated with such a graphite-containing layer, and to the use of the dispersion electrolyte. The dispersion electrolyte comprises Sn2+ ions and/or Ni2+ ions, graphite particles, at least one anionic dispersant, a complexing agent for Sn2+ and Ni2+ ions, a conducting salt and water, and has a pH of 4 to 7.
Claims25
A dispersion electrolyte for the electrodeposition of graphite-containing tin layers, graphite-containing nickel layers or graphite-containing tin-nickel layers, comprising:
- Sn2+ ions at a concentration of 2 to 50 g/L and/or Ni2+ ions at a concentration of 0.2 to 70 g/L;
- graphite particles at a concentration of 5 to 200 g/L;
- at least one anionic dispersant at a concentration of 1 to 25 g/L;
- a complexing agent for Sn2+ and Ni2+ ions;
- a conducting salt;
- and
- water,
- wherein the electrolyte has a pH of 4 to 7.
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A coated metal substrate, wherein the metal substrate is coated with a graphite-containing tin layer, a graphite-containing nickel layer or a graphite-containing tin-nickel layer, wherein the graphite-containing layer contains 0.1 to 8 wt % graphite relative to the total weight of the graphite-containing layer.
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Dependencies are inferred from the claim text.