Detonation-synthesized ultradispersed diamonds as a basis of a new class of composite metal-diamond electroplated coatings

摘要

We have studied the effect of ultradispersed detonation-synthesized diamonds (UDD) on a number of commercially important processes like copper plating, zinc plating, tin plating, silver plating and anodizing of aluminum and its alloys. Traditional electrolytes, which are most widely used in practice, have been used for the studies. The concentrations of UDD additives ranged from 0.1 to 10.0 g/l. In all the processes under study we have managed to considerably increase operating characteristics of the resulting coatings. Thus, addition of UDD to a copper-plating acid electrolyte results in the formation of pore-free copper coatings, whose microhardness increases by a factor of 1.5 and elasticity by a factor of 2, wear decreases by a factor of 9-10, and resistance to corrosion increases manifold. The throwing power of the electrolyte with UDD is trebled. Resistance to corrosion of zinc-diamond coatings (zincate electrolyte) increases by a factor of 2-3 and the throwing power of the electrolyte from 33 to 57%. The use of UDD in tin plating sharply decreases the coating porosity (by a factor of 3-9), increases resistance to corrosion, and trebles wear resistance of a tin-diamond coating. The solderability and electrophysical properties of coatings do not practically change. Wear resistance of silver coatings increases by a factor of 3-10 and microhardness up to 180 kG/mm{sup}2. Wear resistance of an anode film with UDD increases by a factor of 10-13, overweight of this coating increases by a factor of 2-3.5, resistance to corrosion and electrical insulating nature also increase.