Bath for electroplating deposition of Ni-P alloy coating and method for obtaining Ni-P alloy coatings on the difficult-to-bond conductive substrates

摘要

The purpose of the notification is to bathe for galvanic deposition of Ni -P alloy coating,aqueous nickel sulfate acid solution II,NMTF and citric acid are characterised by this,contains nickel salt in the form of sulphate converted to metal 15 - -18 g /dm3,phosphorus in the form of NTMF acid with formula 1 in quantity 100 g /dm3 and citric acid in quantity 10 g /dm3. The purpose of the notification is also to obtain the Ni -P alloy coating on hard welding substrates,consisting of its galvanic deposition from baths constituting an aqueous solution of nickel salt,NTMF acid and citric acid characterised by it,galvanic deposition is obtained from a bath consisting of nickel salt in the form of nickel sulphate II converted into metal 65 (85 g /dm3),phosphorus in the form of NTMF (N -tris -methylenephosphonic acid) of formula 1,in quantity 80 - -100 g /dm3 and citric acid in quantity 1%wag. an appropriate mixture of these preparations for pH within 1,5 -7,5;at the current density in range of 1,0 5,5 A /dm2 for a minimum period of five minutes.