Formation of Plasma Electrolytic Oxidation Coatings on Pure Niobium in Different Electrolytes | Sciact - CRIS-system of Boreskov Institute of Catalysis

Formation of Plasma Electrolytic Oxidation Coatings on Pure Niobium in Different Electrolytes Full article

Journal

Applied Surface Science
ISSN: 0169-4332

Output data

Year: 2022, Volume: 573, Article number : 151629, Pages count : 14 DOI: 10.1016/j.apsusc.2021.151629

Tags

Plasma electrolytic oxidation; Niobium; Microstructure; Photocatalytic activity; Corrosion resistance

Authors

Wu Ting ¹ , Blawert Carsten ¹ , Serdechnova Maria ¹ , Karlova Polina ¹ , Dovzhenko Gleb ² , Wieland Florian D.C. ³ , Stojadinovic Stevan ⁴ , Vasilic Rastko ⁴ , Mojsilovic Kristina ⁴ , Zheludkevich Mikhail L. ^1,5

Affiliations

1	Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Strasse 1, 21502 Geesthacht, Germany
2	Institute of Materials Physics, Helmholtz-Zentrum Hereon, Max-Planck Strasse 1, 21502 Geesthacht, Germany
3	Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck Strasse 1, 21502 Geesthacht, Germany
4	University of Belgrade, Faculty of Physics, Studentski trg 12-16, 11000 Belgrade, Serbia
5	Institute for Materials Science, Faculty of Engineering, Kiel University, Kaiserstrasse 2, 24143 Kiel, Germany

The development of PEO surface treatments for Nb (niobium) provides a possibility to produce functionalized coatings with a combination of new compositions and phases. In the frame of this work, PEO coatings on pure Nb are produced in three electrolytes containing aluminate, phosphate and silicate. Furthermore, the influence of the electrolyte composition on the PEO process and the microstructure, composition and properties of the coatings were studied. It was observed that most of the coating forming species did not participate in the plasma reactions directly, while the chemical-, electrochemical- and thermal stimulated reactions are dominating the coating formation. The results show that all the coatings are mainly composed of the Nb2O5 phase. An additional mixture of oxides (Al2O3 and AlNbO4) is found in the coating formed in aluminate-containing electrolyte, and the coating formed in phosphate-containing electrolyte contains a small amount of Nb2(PO4)3 and amorphous phosphate. No additional crystalline phase other than the amorphous silica phase is detected in the coating formed in silicate-containing electrolyte. Additionally, different morphology of the coatings is revealed and the most uniform coating is produced in silicate-containing electrolyte, which further improves its corrosion resistance. This coating also shows the highest photocatalytic activity due to the combination of Nb2O5 and silica. Since all PEO coatings on pure Nb show superior corrosion resistance and photocatalytic activity, they might be interesting for a wide range of applications ranging from transportation, biomedical implants to environmental protection.

Wu T. , Blawert C. , Serdechnova M. , Karlova P. , Dovzhenko G. , Wieland F.D.C. , Stojadinovic S. , Vasilic R. , Mojsilovic K. , Zheludkevich M.L.
Formation of Plasma Electrolytic Oxidation Coatings on Pure Niobium in Different Electrolytes
Applied Surface Science. 2022. V.573. 151629 :1-14. DOI: 10.1016/j.apsusc.2021.151629 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Jul 2, 2021
Accepted:	Oct 14, 2021
Published online:	Oct 18, 2021
Published print:	Jan 30, 2022

Web of science:	WOS:000724787700004
Scopus:	2-s2.0-85117613176
Elibrary:	47707436
Chemical Abstracts:	2021:2308502
OpenAlex:	W3206981934

DB	Citing
Scopus	26
Web of science	20
OpenAlex	26