Trends in the Development of Machinery and Associated Technology

Silvana Dimitrijevic
2009 unpublished
Institute of mining and metallurgy, Zeleni bulevar 35, 19210 Bor, Serbija, Vlastimir K. Trujic, Institute of mining and metallurgy, Zeleni bulevar 35, 19210 Bor, Serbija, Mirjana M. Rajcic-Vujasinovic, Technical faculty Bor, Vojske jugoslavije 12, 19210 Bor, Serbija, ABSTRACT Gold plating is very commonly used in different areas of techniques, for decorative purposes and corrosion protection. Electrolytes
more » ... sed on cyanide and ferrous cyanide solutions are still present in most of gold plating baths, in spite of large efforts to replace them by some less toxic substance [1]. Gold plating from electrolyte based on cyanide is known as high-risk technology from ecological point of view. In this work the results of synthesis a new type of electrolyte based on gold complex on mercaptotriasole based are presented. Electrolyte itself is described elsewhere [2]. The goal was to establish the optimal parameters for decorative gold plating for this type of electrolyte and compare the results with those obtained from cyanide electrolyte. The methods used were: recording of polarization curves to obtain limiting current densities, experiments in Hull cell and experiments in laboratory cell for gold plating. All experiments were performed with additives. The same experiments were conducted with the cyanide electrolyte but with all additives normally used for decorative plating [3]. This electrolyte can be successfully used for gold plating in comparasion with expensive and risky cyanide bath. Final efects and characteristics pertaing decorative quality of gold coating are well satisfactory. Decomposition and recovery of waste solution can simply be done. Toxicity is not identified. [3]