Mixed alumina and cobalt containing plasma electrolytic oxide coatings
Вантажиться...
Дата
2017
ORCID
DOI
10.1088/1757-899X/213/1/012020
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
IOP Publishing Ltd
Анотація
Principles of plasma electrolytic oxidation of the AL25 aluminum alloy in diphosphate alkali solutions containing cobalt(2+) cations are discussed. It has been established that a variation in the concentration of the electrolyte components provides the formation of mixed-oxide coatings consisting of the basic matrix materials and the cobalt oxides of different content. An increase in the cobalt oxide content in the coating is achieved by the variation in electrolysis current density as well as the treatment time due to both the electrochemical and thermo-chemical reactions at substrate surface and in spark region. Current density intervals that provide micro-globular surface formation and uniform cobalt distribution in the coating are determined. The composition and morphology of the surface causes high catalytic properties of synthesized materials, which confirmed the results of testing in model reaction CO and benzene oxidation as well as fuel combustion for various modes of engine operation.
Опис
Ключові слова
cobalt oxides, plasma electrolytic oxidation, mixed oxide system, catalytic activity
Бібліографічний опис
Mixed alumina and cobalt containing plasma electrolytic oxide coatings / G. Sh. Yar-Mukhamedova [et al.] // 4th Global Conference on Polymer and Composite Materials (PCM 2017), IOP Conference Series: Materials Science and Engineering, 2017. – V. 213. – 6 p.