The Morphology of the Alumina Films Formed tn The Anodization Process of Aluminium in the Orthophosphoric Acid Solution. The Co-Fe Alloys Electrodeposition Into Obtained Alumina Pores

Abstract

The optimal parameters of the anodic oxidation of aluminium in orthophosphoric acid solution was determined. In the pores of the obtained Al 2 O 3 membranes with the ordered nanometric structure Co-Fe alloys were electrodeposited. The Al 2 O 3 membranes were obtained in the two-stage anodic oxidation of aluminium in the 0.17 M H 3 PO 4 solution in the temperature 1 0 C and at the electrolysis voltage 180 V. The influence of the anodizing process parameters on the thickness of oxide films and the diameter of pores and the distance between them in the alumina membranes were determined.The electrodeposition of Co-Fe alloys was carried out from sulphate baths containing sulphates (VI) of copper (II) and cobalt (II) of different composition, in potentiostatic conditions. The optimal electrolysis conditions were determined, where the cathodic deposits of the best quality were obtained. The conditions are: the electrolyte composition: 0.3 M Fe; 0.5 M Co; pH = 3, the potential: -0.760 V (vs. SHE 1) ). Keywords: anodic oxidation of aluminium, nanowires, Co-Fe alloyOkreślono optymalne parametry anodowego utleniania aluminium w roztworze kwasu ortofosforowego W porach uzyskanych membran Al 2 O 3 , o uporządkowanej strukturze nanometrycznej, osadzano elektrolitycznie stopy Co-Fe. Membrany Al 2 O 3 otrzymywano w procesie dwuetapowego utleniania aluminium w roztworze 0,17 M H 3 PO 4 , w temperaturze 1• C, przy napięciu elektrolizy 180 V. Zbadano wpływ parametrów anodowania na grubość warstewek tlenkowych, średnicę porów i odległości między nimi w membranach tlenku glinu.Elektroosadzanie stopów Co-Fe prowadzono z roztworów siarczanowych (VI) zawierających jony miedzi (II) i kobaltu (II) o różnym składzie, w warunkach potencjostatycznych. Określono optymalne warunki elektrolizy, w których otrzymano osady katodowe najlepszej jakości. A mianowicie: skład elektrolitu : 0,3 M Fe; 0,5 M Co; pH = 3, potentiał: −0,760 V (wzgl. SEW).

Electrochemistry at Krakowian research institutions

“…In the first years of the 2000s, the research teams guided by professors Lidia Burzyńska, Wanda Gumowska, and Krzysztof Fitzner performed intensive experiments in the field of, e.g., anodic dissolution [4][5][6][7], metal recovery [8,9], and electrodeposition of transition group composites [10][11][12] and metal alloys [13,14]. Then, with the growth of the research group, many new directions of interest have appeared, such as catalytic properties of transition group metals and alloys [15][16][17][18][19], tellurium thin films [20,21], and synthesis of nanostructures in the anodic alumina oxide templates [22][23][24]. The influence of the magnetic field on the properties of the electrodeposited coatings has been investigated [25][26][27].…”

Plasma Electrolytic Oxidation Coatings on Aluminum Alloys: Microstructures, Properties, and Applications

“…The schematic equipment of anodic oxidation is also shown in Figure 4. In anodic oxidation the electrolyte used is acidic, this can be either sulphuric acid, chromic acid, phosphoric acid, oxalic acid, or boric acid used singly or in combination [27][28][29][30][31]. Prior to anodizing, samples are pretreated by polishing their surfaces with SiC paper and degreased with alcohol or acetone and cleaned with deionized water [32].…”

Magnetic Vortex Domain Wall Observation on Polycrystalline Imperfect Iron−Cobalt Alloy Nanowires Growing on 1050 Aluminum

“…[23] The use of PAA templates for the fabrication of Fe x Co 100Àx Nws is widely reported as it can achieve diameters from 10 nm [24] up to 300 nm; [25] lengths between 700 nm [26] and 40 μm; [27] and interwire distances from 22 [28] to 430 nm. [29] In most cases, PAA templates are of high-purity aluminum, [24,27,28,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] and although the use of low-purity Al for the fabrication of Nws is attractive due to its reasonable price (a thousand times cheaper than those of high purity), [47,48] very few reports can be found in the literature.…”