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Information × Registration Number 0207U004746, 0104U000653 , R & D reports Title Enviromental hrotection and rational use of nature resources of Ukraine (on the example of machine bulding and instruments construction plants) popup.stage_title Head Larin Vasilii Ivanovich, Registration Date 14-08-2007 Organization Kharkov national university named after V.N. Karazin popup.description2 The objects of the investigation - copper and aluminium alloys, surfactants, electrolytes. The aim of the investigation - to elaborate and to practise the procedures of alloys and electrolytes analysis, to study the processes of alloy electrochemical and chemical dissolving and the surfactants, to decide the problem of waste technological solution utilization. The copper alloys, electrolytes underlying for their electrochemical and chemical dissolv-ing as well as surfactants have been analyzed. The processes of Cu-Ni, Cu-Fe, Cu-Zn alloys dissolving in aqueous solutions as well as in chloride-contained acetonitrile and it aqueous mix-tures have been studied. In NaCl + NaOH solution has been shown to proceed the Cu-Fe alloy passivation by Fe(OH)2, Fe(OH)3, Cu(OH)2 hydroxide mixture at potential range from +0,35 V. The CuFeO4 formation starts on the electrolyser anode, in aqueous solutions Cu-Zn alloy dissolving velocity is lower comparing with that one of the alloy individual components. Brass dissolving in water-acetonitrile mixtures is limited by cathode stage of the process. The nature of inhibiting com-pounds is established, they are CuCl, CuOH and ZnO for aqueous solutions, for aqueous-organic ones - also Cu(OH)2 and Zn(OH)2 . The kinetics of Cu-Zn ?-alloy anode dissolving in stationary conditions has been ana-lyzed and experimentally investigated. The values of surface layer thickness on copper and brass at various withstanding time in solutions of chemical polishing contained H2O2 + H2SO4 + C2H5OH have been evaluated and experimentally determined. The environmentally safe scheme of dimensional copper-zinc alloys treatment with the following defensive-decorative coating patterning has been proposed. The mechanism of aluminium alloys ionization in sodium hydroxide aqueous solutions has been established and the possibility of the application of waste alkaline aluminate etching solutions as coagulants in water recycling schemes has been predicted. It has been shown, that aluminium hydroxide can serve as precipitating reagent of alu-minium hydroxide from waste etching solutions, that permit to provide the etching and regenera-tion processes in closed cycle with full waste and industry sewer avoiding. Product Description popup.authors popup.nrat_date 2020-04-02 Close