IMPROVEMENTS IN OR RELATING TO THE DEVELOPMENT OF ELECTROPLATING BATH FOR DEPOSITION OF HIGH TUNGSTEN NICKEL ALLOY ON CARBON STEEL SUBSTRATES

摘要

In the present invention there is provided an electroplating bath and process for the deposition of high tungsten nickel alloy on carbon steel substrates, wherein the bath consists of nickel sulphate 40 gpl, sodium tungstate 40 to 120 gpl, sodium citrate 160 gpl, ammonium sulphate 160 gpl. The electroplating process is effected utilizing the above bath at pH of the order of 8 with stainless steel sheets as anodes and carbon steel as cathode at a current density of the order of 2.5 A/dm2, at a temperatue of the order of 30 degree C, to obtain deposits of about 90% tungsten containing nickel deposition on carbon steel substrates with acceptable lustre with 4 to 4.2 muA/cm2 corrosion current density in 3% Nacl solution.