PROCESS IMPROVEMENT OF THE GOLD PLATING FROM WEAK-ACID AND NEUTRAL ELECTROLYTES

Abstract

The process improvement of the gold plating by means of the choice of the kind and compounds of solutions and regimes of the precipitation introduction for the stability insurance of physical-mechanical characteristics of gold coatings and the prolongation of electrolyte service life is the aim of the paper. As a result the interconnection of some functional characteristics with gold has been cleared up. Principles of the coating property control have been formulated. Reasons of the parameter instability for the plating process have been established. Ways for the parameter stabilization have been suggested. Technical solutions for the stabilization of physical-mechanical characteristics of gold coatings, precipitated from citrate, phosphate and borate electrolytes, solutions making it possible to prolong the solution service life and to decrease the gold expenditure, have been developed. Borate electrolytes and the method of the gold utilization by activated carbon have passed trial-industrial tests. The developments suggested make it possible to decrease the non-productive discharge of precious metals. The paper results may find their field of application in the production of various details of radio electronics, etcAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio