Patent ID: 8226807
Filing Date: 2012-07-24
Classification: C25D,H01R

Abstract:
1. A method for applying a composite coating onto a metal surface of an electrical component, the method comprising: contacting the metal surface with an electrolytic plating composition comprising (a) a source of tin ions and (b) a pre-mixed dispersion of non-metallic particles having a mean particle size between about 10 and about 500 nanometers and a particle size distribution in which at least about 30 volume % of the particles have a particle size less than 100 nm, wherein the non-metallic particles have a pre-mix coating of surfactant molecules thereon; and applying an external source of electrons to the electrolytic plating composition to thereby electrolytically deposit the composite coating onto the metal surface, wherein the composite coating comprises tin and the non-metallic particles; wherein the non-metallic particles are fluoropolymer particles; and wherein the pre-mixed dispersion comprises fluoropolymer particles, a non-ionic surfactant, and a cationic surfactant.