Ternary tin zinc alloy, electroplating solutions and galvanic method for producing ternary tin zinc alloy coatings

Abstract

The invention relates to ternary tin zinc alloy coatings 30-65 wt. % tin, 30-65 wt. % zinc and 0.1-15 wt. % metal from the following group as a third alloy component; iron, cobalt, nickel. Correspondingly, alloy coatings can be produced by means of electrolytic deposition from aqueous galvanic electroplating solutions which contain the components of the alloy in a dissolved form. The alloy coatings are characterised in that they have a particularly high resistance to corrosion and are particularly suitable as anti-corrosion protective coatings on iron-based materials.

1 . Ternary tin-zinc alloys characterized in that they consist of 30 to 65% by weight tin, 30 to 65% by weight zinc, and 0.1 to 15% by weight of a metal from the group iron, cobalt, or nickel as the third alloy component.  
     
     
         2 . Ternary tin-zinc alloys according to  claim 1 , characterized in that they consist of 40 to 55% by weight tin, 45 to 55% by weight zinc and 1 to 5% by weight cobalt.  
     
     
         3 . Ternary tin-zinc alloys according to  claim 1 , characterized in that they consist of 35 to 50% by weight tin, 50 to 65% by weight zinc and 0.1 to 5% by weight nickel.  
     
     
         4 . Ternary tin-zinc alloys according to  claim 1 , characterized in that they consist of 40 to 55% by weight tin, 40 to 60% by weight zinc and 1 to 8% by weight iron.  
     
     
         5 . Alkaline, neutral or weakly acidic galvanic electrolyte baths containing the alloy components in dissolved form and, optionally, other usual additives, for electrolytic production of alloy layers of ternary tin-zinc alloys according to  claims 1  to  4 .  
     
     
         6 . Process for producing alloy layers of ternary tin-zinc alloys according to  claims 1  to  4 , characterized in that they are deposited electrolytically from an alkaline, neutral or weakly acidic galvanic electrolyte bath containing the alloy components in dissolved form with, optionally, other usual additives.  
     
     
         7 . Use of galvanically produced alloy layers of ternary tin-zinc alloys according to  claims 1  to  4  as anticorrosion layers.  
     
     
         8 . Use of galvanically produced alloy layers of ternary tin-zinc alloys according to  claims 1  to  4 , with subsequent passivation, as anticorrosion layers on ferrous materials.  
     
     
         9 . Use of galvanically produced alloy layers of ternary tin-zinc alloys according to  claims 1  to  4  as weldable coatings.  
     
     
         10 . Use of galvanically produced alloy layers of ternary tin-zinc alloys according to  claims 1  to  4  as final decorative coatings.