(C2) ;Verfahren zum Herstellen von Gleitlager-Schichtwerkstoff oder Gleitlager-Schichtwerkst穟cken

摘要

In order, in lamellar material or lamellar parts for plain bearings, to form a bonding layer of pure silver between a single-layer or multi-layer substrate material or part and an electrolytically deposited sliding-layer alloy, the invention calls for the bonding layer to be built up electrolytically in two stages, viz: a pre-silvering stage for the formation of a preliminary layer about 0.1 mu m to about 0.5 mu m thick and a main silvering stage for the formation of a main layer about 2 mu m to about 10 mu m thick. The galvanic silver-plating baths used in both stages contain substantially the same substances, but the concentrations of the substances differ significantly. In particular, the silver concentration is significantly lower in the pre-silvering bath than in the main silvering bath. In order to build up the bonding layer of pure silver on substrate layers of aluminium, a very thin metal coating is applied containing at least one of the metals zinc, nickel, copper and iron. This is preferably carried out using an appropriate aluminium immersion liquid.