Synthesis of catalytic cobalt-containing coatings on alloy AL25 surface by plasma electrolytic oxidation
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Дата
2017
ORCID
DOI
doi.org/10.15407/hftp08.01.073
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
Інститут хімії поверхні ім. О. О. Чуйка НАН України
Анотація
The study aims at the investigation of the influence of electrolyte composition and plasma electrolytic oxidation modes on the composition and morphology of a mixed aluminum and cobalt oxides at the AL25 alloy. Composition, morphology and surface roughness of the oxide systems are examined by scanning electron microscopy, X-ray analysis and atomicforce microscopy. Mixed oxide coatings Al₂O₃·CoOₓ formed from the diphosphate electrolytes at various concentration ratio diphosphate/cobalt sulfate contain cobalt of 8-30 at. % (in terms of metal) in the matrix of alumina. Plasma electrolytic oxidation in a two-stage mode of the incident power provided formation of strongly adhered coatings characterized by non-stoichiometry ratio of cobalt and oxygen as well aslow content of silicon in deposits. Obtained mixed oxide systems have developed surface with alternating the spheroid and torus-shaped structures which is associated with a large number of catalytic sites. They exhibit catalyticbehavior in the model reactions of CO conversion to CO₂ and benzene oxidation not inferior to the contacts with noble metals. The coatings Al₂O₃·CoOₓ contribute to fuel economy and improve the environmental performance of the internal combustion engine thus can be recommended for use in the neutralization of gas emissions systems and as coatings for pistons of combustion chamber.
Опис
Ключові слова
AL25 alloy, cobalt oxides, plasma electrolytic oxidation, mixed oxide system, surface morphology, catalytic activity
Бібліографічний опис
Synthesis of catalytic cobalt-containing coatings on alloy AL25 surface by plasma electrolytic oxidation / M. V. Ved [et al.] // Хімія, фізика та технологія поверхні = Chemistry, Physics and Technology of Surface. – 2017. – Т. 8, № 1. – С. 73-79.