Functional properties and ecological safety of Boron-containing coatings obtained by autocatalytic reduction
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IVANOV, M., COVALIOV, Victor, COVALIOVA, Olga. Functional properties and ecological safety of Boron-containing coatings obtained by autocatalytic reduction. In: Ecological Chemistry, Ed. 3rd, 20-21 mai 2005, Chişinău. Chișinău, Republica Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2005, 3rd, pp. 475-476. ISBN 9975-62-133-3.
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Ecological Chemistry
3rd, 2005
Conferința "Ecological Chemistry"
3rd, Chişinău, Moldova, 20-21 mai 2005

Functional properties and ecological safety of Boron-containing coatings obtained by autocatalytic reduction


Pag. 475-476

Ivanov M.1, Covaliov Victor2, Covaliova Olga2
 
1 A.N.Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Science,
2 Moldova State University
 
 
Disponibil în IBN: 14 septembrie 2021


Rezumat

Technological peculiarities are given of ecological safety provision of autocatalytic obtaining of the functional boron-containing coatings on the base of nickel and boron, using sodium hypophosphite (SHP) jointly with the dimethylamineborane (DMAB) or sodium borohydride (BH). The coatings may be obtained under the conditions of automatic regulation [1]. For non-metals metallization the method of palladium-free surface activation was proposed [2]. The plating processes were performed in the solutions containing acetic, malic acid and glyconate, as stabilizing additives PbCl2 or ТlNO3 was used. In these solutions in conditions of high stability of electrolyte, Ni (Co)-B-P alloys are formed with the low contents in boronr within the range of 1,6-2 % and high contents in phosphorus (up to 7,1%). The rate of coatings deposition is described with the curve with the maximum 5,2 mkm/H on 1,5 g/l DMAB, or up to 10 mkm/H on 1,0 g/l BH. Using the Roentgen-structural analysis, positrons annihilation, Ojespectroscopy and ESCA methods, structural-phase transformations and mechanical characteristics of alloys were studied. The method and equipment was proposed to obtain the composite coatings, in which as a second phase high-disperce diamonds and corundum was used [7]. The processes of boron thermodiffusion in the deposits obtained in a chemical [8] and electrochemical [9] method and its effects in the surface layers on wettability with the quick solders were studied. On the base of this research such coatings were proposed to substitute the precious metals in radio-electronics. Once such coatings are alunimized and leached, metal catalysts of skeleton structure can be prepared and used for the processes of hydrocarbon fuel burning and air emissions treatment [4]. To prevent the evaporation of the working solutions, we have tested the method of application on the surface of the floats made of inert materials [6]. For this scope hydrophobized expanded perlite was used with the granulae dimensions 1-3 mm. The extraction of residual contents in metal and detoxication of used technological solutions and waste water, was performed by the introducing of regents-reducers into them, namely sodium borohydride and sodium hypophosphite in the ratio 1 : (1,2-1,4) with regard to the residual contents in nickel ions in solution. The treatment process was carried out using the equipment with the magnetic fluidization of metal particles in the revolving electromagnetic field with the application of constant current on electrodes with the density of 3-5 А/dm2 and voltage of 6-12 V [3, 5]. The described complex of technologic elaborations permitted to approach the processes of chemical-catalytical deposition of metal coatings to the conditions of pure production.