Composition and magnetic characteristics of plasma electrolytic oxide coatings on titanium

• Published in: Protection of metals and physical chemistry of surfaces 2017-09, Vol.53 (5), p.826-834
• Main Authors: Rudnev, V. S., Adigamova, M. V., Tkachenko, I. A., Yanushkevich, K. I., Lukiyanchuk, I. V., Morozova, V. P.
• Format: Article
• Language: English
• Subjects: Atomic properties; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Crystallites; Electrolytes; Ferromagnetism; Hydroxides; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Iron; Magnetic properties; Materials Science; Metallic Materials; Nanoscale and Nanostructured Materials and Coatings; Oxide coatings; Porosity; Titanium; Tribology
• ISSN: 2070-2051; 2070-206X
• DOI: 10.1134/S2070205117050185

The results of studies of the composition and magnetic characteristics of coatings formed in different time periods on titanium in suspension electrolytes of compositions Na 3 PO 4 + Na 2 B 4 O 7 + Na 2 WO 4 + Fe 2 (C 2 O 4 ) 3 (PBWFe, рH 7.8) and Na 2 НPO 4 + Na 2 B 4 O 7 + Na 2 WO 4 + Fe 2 (C 2 O 4 ) 3 (P*BWFe, рН 7.4), as well as the characteristics of coatings fabricated in filtrates of both electrolytes, are presented. PBWFe and P*BWFe electrolytes contain colloid particles of iron hydroxides. Crystallites are contained in pores of PBWFe and P*BWFe coatings. The averaged Fe/Ti atomic ratio for crystallites in pores of PBWFe coatings formed in different periods of time is equal to ~2.6, while in pores of P*BWFe coatings it is equal to ~1.1. The samples with PBWFe coatings manifest ferromagnetic properties, while samples with P*BWFe coatings and those obtained in filtrates of both electrolytes are paramagnetics. It was shown that, for PBWFe and P*BWFe coatings formed in different time periods, the composition, thickness, and presence and composition of crystallites in pores, as well as magnetic and other controlled parameters, are fairly reproducible.