Coating process and composition.

摘要

A process for coating an article simultaneously with a metal and a film-forming polymer which comprises passing an electric current at a current density of 1 to 35 milliamps cm<-><2> between the article as a cathode and a counter-electrode immersed in an aqueous coting composition having an inherent pH of 2.5 to 9.5, comprising: (a) a dispersion in an aqueous carrier of film-forming polymer having steric stabilising units and being free from ionic stabilising units the dispersion being one which has a critical coalescence value more negative than -0.3 units and (b) at least 0.06% by weight based on the total composition of one or more zinc, cadmium, cobalt, iron, lead or nickel salts such that the dispersion has a critical coalescence temperature of 35 to 95 DEG C.