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Anticorrosive processing of low-carbonaceous steel by pulsed plasma flows
Engineering Education # 12, December 2013
DOI: 10.7463/1213.0670510
Development of new progressive technologies for improving corrosion resistance of construction materials is a crucial scientific and technical task which could be solved efficiently by modification of various plasma methods. This work considers a possibility of obtaining the corrosion-resisting effect by modifying physical and chemical properties of constructive materials’ surfaces during processing with high enthalpy pulsed plasma flows. A pulsed technological plasma burner based on a high-current discharge magnetoplasma compressor in the atmosphere was developed. Results of an experimental research of energetic, thermodynamic and temporal characteristics of the impact of pulsed plasma flows on construction materials were presented: the temperature of the plasma flow was 13000 …15000K, of the plasma pressure – 70…390 bar, radiation flux density was up to 300 kW/cm2, energy density of the plasma exposure was 10... 40 J/cm2, a typical exposure time was 65 ... 125 ms. Irradiation experiments with pulsed plasma flows made of samples of St3 steel were performed. Evaluation of corrosion properties of plasma-modified surfaces was carried out. A significant increase in corrosion resistance of surfaces of structural carbon steels modified by such kind of treatment was demonstrated using the method of accelerated tests.
Experimental studies of degradation of ethylenediaminetetraacetic acid (EDTA) in aqueous solutions with high concentration of sodium nitrate under pulsed broadband ultraviolet radiation
Engineering Education # 06, June 2013
DOI: 10.7463/0613.0577231
Experimental results of degradation of ethylenediaminetetraacetic acid (EDTA) under pulsed broadband UV radiation in the presence of hydrogen peroxide are presented in this article. The object of research was an aqueous solution containing EDTA with the initial concentration of 15 to 100 mg/l and sodium nitrate (NaNO3) with the initial concentration of 4 g/l. Energy consumption for degradation and complete mineralization of ethylenediaminetetraacetic acid degradation products was estimated depending on the initial concentration of the acid, presence or absence of sodium nitrate and hydrogen peroxide at the concentration of 3 g/l.
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