Real-time imaging, spectroscopy, and structural investigation of cathodic plasma electrolytic oxidation of molybdenum

In this paper, the results of the investigation of cathodic plasma electrolytic oxidation (CPEO) of molybdenum at 160 V in a mixed solution of borax, water, and ethylene glycol are presented. Real-time imaging and optical emission spectroscopy were used for the characterization of the CPEO. During t...

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Bibliographic Details
Published in:Journal of applied physics 2015-06, Vol.117 (23)
Main Authors: Stojadinović, Stevan, Tadić, Nenad, Šišović, Nikola M., Vasilić, Rastko
Format: Article
Language:English
Subjects:
Applied physics
BALMER LINES
Borax
Chemical composition
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COATINGS
ELECTRIC FIELDS
Electron energy
ELECTRON TEMPERATURE
EMISSION SPECTROSCOPY
Energy dispersive X ray spectroscopy
Ethylene glycol
GLYCOLS
HYDROGEN
Hydrogen storage
Line shape
Line spectra
MATHEMATICAL SOLUTIONS
MOLYBDENUM
Molybdenum oxides
Molybdenum trioxide
MORPHOLOGY
Optical emission spectroscopy
Organic chemistry
OXIDATION
Phase composition
PLASMA
Real time
SCANNING ELECTRON MICROSCOPY
SHAPE
Spectrum analysis
SURFACES
X ray spectra
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
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Summary:In this paper, the results of the investigation of cathodic plasma electrolytic oxidation (CPEO) of molybdenum at 160 V in a mixed solution of borax, water, and ethylene glycol are presented. Real-time imaging and optical emission spectroscopy were used for the characterization of the CPEO. During the process, vapor envelope is formed around the cathode and strong electric field within the envelope caused the generation of plasma discharges. The spectral line shape analysis of hydrogen Balmer line Hβ (486.13 nm) shows that plasma discharges are characterized by the electron number density of about 1.4 × 1021 m−3. The electron temperature of 15 000 K was estimated by measuring molybdenum atomic lines intensity. Surface morphology, chemical, and phase composition of coatings formed by CPEO were characterized by scanning electron microscopy with energy dispersive x-ray spectroscopy and x-ray diffraction. The elemental components of CPEO coatings are Mo and O and the predominant crystalline form is MoO3.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4922870