Composites with transition metal oxides on aluminum and titanium and their activity in CO oxidation

Lukiyanchuk, I. V.; Руднев, В. С.; Chernykh, I. V.; Малышев, Юрий Валентинович; Tyrina, L. M.; Adigamova, M. V.

doi:10.1016/j.surfcoat.2012.10.031

Cited by 18 publications

(7 citation statements)

References 9 publications

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“…The oxide peak around 529.6 eV is symptomatic of TiO 2 and NiO . The peaks of Ni2p 3/2 and Ni2p 1/2 indicate that the Ni 2+ in the electrolyte was incorporated into the coatings during the MAO process, and formed NiO and Ni(OH) 2 …”

Section: Resultsmentioning

confidence: 99%

“…28 The peaks of Ni2p 3/2 and Ni2p 1/2 indicate that the Ni 2+ in the electrolyte was incorporated into the coatings during the MAO process, and formed NiO and Ni(OH) 2 . [29][30][31][32] The coating composition can, therefore, be expressed as a mixture of different possible compounds, like titanium dioxide, nickel oxide, and nickel hydroxide with a small sodium phosphate contribution. Sodium phosphate may become trapped in the coating and is not washed away completely.…”

Section: Phase and Chemical Composition Of The Coatingsmentioning

confidence: 99%

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High‐performance infrared emissivity of micro‐arc oxidation coatings formed on titanium alloy for aerospace applications

Tang

Tao

Wang

et al. 2018

Int J Applied Ceramic Tech

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Aerospace vehicles are subjected to high temperatures because of surrounding aerodynamic drag and the formation of large temperature gradients across the external structural parts of their airframe. To protect the vehicles, high‐infrared emissivity coatings that can radiate a large amount of heat into outer space are in demand. In this work, we describe the development and characterization of high emissivity ceramic coatings formed on a TC4 alloy surface by micro‐arc oxidation. We evaluate, in particular, the influence of NiSO4 concentration on current‐time response, the thickness, surface roughness, morphologies, bonding strength, and emissivity of these coatings. The results indicate that by increasing the NiSO4 concentration in electrolytes, the thickness and surface roughness of the coatings increase. The bonding strength becomes smaller with increasing concentration of NiSO4, but is still maintains a value higher 30 MPa. The coatings possess good thermal shock resistance after being subjected to severe thermal shocks for 50 cycles, and no peeling of the coating is observed. A higher concentration of NiSO4 in electrolytes also leads to an increasing percentage of the nickel components in the coating to form a NiO phase, which enhances the emissivity of the coatings in the wavelength range of 3‐8 μm.

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Section: Resultsmentioning

confidence: 99%

Section: Phase and Chemical Composition Of The Coatingsmentioning

confidence: 99%

High‐performance infrared emissivity of micro‐arc oxidation coatings formed on titanium alloy for aerospace applications

Tang

Tao

Wang

et al. 2018

Int J Applied Ceramic Tech

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“…For instance, if for the Co-Cu sample the half conversion temperature is equal to 221°C, for the Cu-Co sample T 50 = 216°C. In the case of cobalt-copper oxide systems, whose high activity was mentioned in [29][30][31][32], the synergetic effect can be related to partial formation of the nons toichiometric solid solution of the spinel structure CuCo 2 O 4 -Co 3 O 4 . Spinel differs from individual cobalt and copper oxides in its ease of restructuring, the pres ence of defects, and the specific mechanism of elec tron exchange: a "jump" between adjacent ions.…”

Section: Resultsmentioning

confidence: 99%

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

Tyrina

Руднев

Lukiyanchuk

et al. 2015

Prot Met Phys Chem Surf

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Coatings on aluminum alloy containing one or several crystalline oxides of cobalt, copper, and cerium deposited in different sequences have been obtained by a combination of methods of plasma electro lytic oxidation and impregnation followed by annealing. It has been established that the composition of sur face layers and the catalytic activity of composites depend on the sequence of deposition of active components on the substrate. Cu 2+ , Cu + , Co 3+ , Ce 4+ , and Ce 3+ are present in the surface and subsurface layers. All the studied composites are characterized by catalytic activity in the reaction of oxidation of CO into CO 2 . Of the studied composites, the following are most active: Ce

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“…This parameter is essential for predict-ing the catalytic properties of materials of this type [24]. For application of catalytic layer on the porous structure of the carrier, impregnation of the obtained materials with compounds of catalytic compositions based on salts of transition metals followed by their subsequent thermal decomposition is most often used [25,26]. In general, the considered method of forming catalytic material is multistage and combines various processes.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Analysis of technological approaches to electrochemical surface treatment of aluminum alloys

Karakurkchi

Сахненко

Ved

et al. 2020

EEJET

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strength characteristics, alloying components (manganese, iron, copper, silicon, magnesium, etc.) are introduced into alloys, which form intermetallic compounds in the alloy structure. This causes the surface heterogeneity of alloyed aluminum alloys, significantly reduces corrosion resistance in aggressive media and complicates the surface treatment of such materials [9]. To give additional functional properties to the surface, surface modification methods are used, when predetermined indicators can be achieved without changing the structure of the base material [10]. Such surface engineering technologies are in demand and promising. Application of thin-film coatings for surface protection and strengthening [11, 12], formation of catalytically active layers [13, 14], electrochemical [15] and plasma-chemical treatment are the most common [16]. Variations and combinations of treatment methods

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Composites with transition metal oxides on aluminum and titanium and their activity in CO oxidation

Cited by 18 publications

References 9 publications

High‐performance infrared emissivity of micro‐arc oxidation coatings formed on titanium alloy for aerospace applications

High‐performance infrared emissivity of micro‐arc oxidation coatings formed on titanium alloy for aerospace applications

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

Analysis of technological approaches to electrochemical surface treatment of aluminum alloys

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