(19)
(11) EP 0 188 386 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.10.1986 Bulletin 1986/41

(43) Date of publication A2:
23.07.1986 Bulletin 1986/30

(21) Application number: 86300301

(22) Date of filing: 17.01.1986
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 18.01.1985 GB 8501245

(71) Applicant: ENGELHARD CORPORATION
 ()

(72) Inventors:
  • Wilkinson, Peter
     ()
  • Mayne, Julia Mary
     ()

   


(54) Gold electroplating bath


(57) An acid gold electroplating bath contains gold in an electrodepositable form, such as potassium gold cyanide, together with a metallic additive and an organic additive.
The organic additive is a compound of the formula

wherein X is -N= or -CR3=, and R1, R2 and R3 are each hydrogen, or an amino-, amido, thioamido- or cyano- group provided that one (and no more than one) of R', R2 and R3 is not hydrogen.
The metallic additive is preferably a cobalt, nickel or iron salt.





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