Simultaneous electrodeposition of metal and film-forming polymer from a single bath

• Main Authors: ANDREW DOROSZKOWSKI, MICHAEL ARTHUR TOYNTON, PETER BUTLER
• Format: Patent
• Language: English
• Published: 31.01.1990
• Subjects: ADHESIVES; APPARATUS THEREFOR; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FILLING PASTES; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; USE OF MATERIALS THEREFOR; WOODSTAINS

A process for coating an article simultaneously with a metal and 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 coating 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 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. The film-forming polymer may be an epoxy resin in which the steric stabilising unit comprises a non-ionic hydrophilic moiety derived from a polymer which comprises repeating oxyalkylene units. D