Bright tin-nickel alloy plating electrolyte

Details Bright tin-nickel alloy plating electrolyte Bright tin-nickel alloy plating electrolyte

C - Chemistry, Metallurgy

25

D

204/27.5

C25D 3/36 (2006.01) C25D 3/56 (2006.01) C25D 3/60 (2006.01)

Patent

CA 1045075

BRIGHT TIN-NICKEL ALLOY PLATING ELECTROLYTE ABSTRACT OF THE DISCLOSURE A bright tin-nickel alloy plating electrolyte consists essentially of an aqueous main plating liquid containing a stannous salt, a nickel salt and an alkali-metal pyrophosphate, with a brightener additive in such main plating liquid which is a compound having a plurality of amino groups as its only functional groups, for example, ethylenediamine, 1,2-propanediamine, 1,3-propanediamine, 1,4-butanediamine, pentamethylenediamine, hexamethylenediame, hydrazine, quanidine, urea or thiourea. The bright tin-nickel alloy plating electrolyte may further contain ammonia or an ammonium salt, and the electrolyte, with or without the addition of the ammonia or ammonium salt,may further have added thereto a compound containing an -SX group (in which X represents hydrogen, sodium or potassium), a peptone and/or protein, or a neutral amino acid which is free of sulphur or a salt thereof.

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