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Electrodeposition of Yellow Bronze from Acidic Sulfate Baths Containing Polyether Laprol and Micromolar Additives of Halides Z. Mockus, S. Kanapeckaité, V. Jasulaitiené, and A. Survila Institute of Chemistry, Göstauto 9, Vilnius, LT01108 Lithuania e-mail:
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Received April 23, 2005 Abstract — The composition of yellow bronze coatings deposited from acidic sulfate solutions added with polyether laprol and the electrodeposition conditions are studied by voltammetry and XPS. It is found that halides in rather low (micromolar) concentrations affect significantly the partial electrodeposition processes. Chlorides increases cathodic polarization, widen the current window of the yellow bronze electrodeposition, and favor the increase in tin content of the coatings. Bromides narrow the current window, lower the tin content in the coatings, and hinder the yellow bronze surface oxidation. Iodides inhibit the copper electroreduction markedly, which makes the yellow bronze deposition practically impossible. PACS numbers: 81.15.Pq, 82.45.Qr DOI: 10.1134/S0033173206050079 Keywords: copper, tin, deposition, polyether laprol, halides
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