Investigation of plasma electrolytic oxidation on valve metals by means of molecular spectroscopy – a review

Abstract

A review of results of molecular spectroscopic investigations during plasma electrolytic oxidation of valve metals is presented.

Anodic luminescence, structural, photoluminescent, and photocatalytic properties of anodic oxide films grown on niobium in phosphoric acid

“…Ref. [20] and references therein). In contrast, the appearance of atomic and ionic lines originating from the metallic substrate depends on its melting point and/or on the electrolyte used for anodization [18,25,26].…”

“…It has been shown that luminescence spectrum during the spark discharging of metals is composed of continuum radiation and spectral lines [19,20]. Continuum radiation results from the radiative recombination of electrons at defects in oxide films and bremsstrahlung radiation [19].…”

Characterization of plasma electrolytic oxidation of magnesium alloy AZ31 in alkaline solution containing fluoride

“…members of the band sequence v′ = v″. For a comprehensive review of experimental and theoretical studies on this system the reader is referred to our recent studies [7,21,25].…”

“…or metallic alloys [7]. This process involves anodizing above the dielectric breakdown voltage and leads to the formation of localized plasma microdischarges.…”

The effect of nanocrystallites in the pores of PEO coatings on their magnetic properties

“…To obtain such composites one can use plasma electrolytic oxidation (PEO) technique [1,[3][4][5] that is electrochemical oxidation of valve metals under spark and microarc electric discharges [6][7][8][9][10][11][12][13].…”