Effect of UV irradiation and diffuse plasma on surface properties of micro-arc calcium phosphate coatings

The influence of UV irradiation or plasma of runaway electron preionized diffuse discharge (REP DD) post-modification on the surface properties of the calcium phosphate (CaP) coatings formed by the micro-arc oxidation (MAO) method was investigated. The formed MAO-coatings had porous structure and ro...

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Bibliographic Details
Published in:Journal of physics. Conference series 2019-11, Vol.1393 (1), p.12077
Main Authors: Chebodeva, V V, Komarova, E G, Erofeev, M V, Ripenko, V S, Sharkeev, Yu P
Format: Article
Language:English
Subjects:
Bonding strength
Calcium phosphates
Coatings
Free surfaces
Irradiation
Morphology
Oxidation
Phosphate coatings
Physics
Structural members
Surface energy
Surface properties
Ultraviolet radiation
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Summary:The influence of UV irradiation or plasma of runaway electron preionized diffuse discharge (REP DD) post-modification on the surface properties of the calcium phosphate (CaP) coatings formed by the micro-arc oxidation (MAO) method was investigated. The formed MAO-coatings had porous structure and rough surface morphology with incorporation of spheroidal structural elements with inner pores. It was showed that the UV irradiation or REP DD post-treatment of the MAO-coatings led to the decrease of the coating contact angels with water from 20 to 0 or to 7 degrees, respectively. However, the free surface energy of the coatings did not change after post-treatments and equalled to 74±1 mJ·m−2. The polar component of the free surface energy of the all types of the coatings exceeded almost 5-6 times the dispersion component that indicated the presence of strong polar bonds on the coating surface, e. g. OH- and PO4-groups.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1393/1/012077