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Open AccessArticle

Bifunctional TiO2/AlZr Thin Films on Steel Substrate Combining Corrosion Resistance and Photocatalytic Properties

1
ICD-LASMIS, Université de Technologie de Troyes CNRS, Antenne de Nogent, Pôle Technologique de Sud Champagne, 52800 Nogent, France
2
NICCI, LRC CEA-ICD LASMIS, UTT, Antenne de Nogent, Pôle Technologique de Sud Champagne, 52800 Nogent, France
3
Univ. Grenoble Alpes, CNRS, Grenoble INP, LMGP, 38000 Grenoble, France
4
LaSIE UMR 7356 CNRS, La Rochelle Université, Avenue Michel Crépeau, 17042 La Rochelle, France
5
CEA, PTCMP, Centre de Saclay, 91191 Gif-sur-Yvette, France
6
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(9), 564; https://doi.org/10.3390/coatings9090564
Received: 26 June 2019 / Revised: 29 August 2019 / Accepted: 30 August 2019 / Published: 3 September 2019
A novel multi-functional bilayer coating combining an anti-corrosion Al–Zr (4 at.% Zr) underlayer and an anti-biofouling TiO2 top layer was deposited on high-speed steel (HSS) substrates. Al–Zr (4 at.% Zr) film, deposited by DC magnetron sputtering, which is a single phased supersaturated solid solution of Zr in Al, is used to provide sacrificial corrosion resistance of steels and TiO2 is added as a top layer to induce photocatalytic activity and hydrophilic behavior which can generate antifouling properties in order to slow down the biofouling process. The top TiO2 films, deposited at 550 °C by AACVD (aerosol-assisted chemical vapor deposition), consisting of anatase TiO2 microflowers physically attached to the TiO2 thin films present a high decomposition rate of Orange G dye (780 × 10−10 mol L−1·min−1). The enhanced photocatalytic performance is associated with the rough network and the presence of TiO2 microflowers capable of supporting the enhanced loading of organic contaminants onto the film surface. Electrochemical tests in saline solution have revealed that bilayer films provide cathodic protection for the steel substrate. The Al–Zr/TiO2 bilayer presents a lower corrosion current density of 4.01 × 10−7 A/cm2 and a corrosion potential of −0.61 V vs. Ag/AgCl, offering good protection through the preferential oxidation of the bilayer and an increased pitting resistance. The proposed functionalized coating combining anticorrosion and photocatalytic properties is a promising candidate for an anti-fouling system in sea water. View Full-Text
Keywords: Al–Zr; TiO2; corrosion; photocatalysis; aerosol CVD; magnetron sputtering Al–Zr; TiO2; corrosion; photocatalysis; aerosol CVD; magnetron sputtering
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MDPI and ACS Style

Villardi de Oliveira, C.; Alhussein, A.; Creus, J.; Schuster, F.; Schlegel, M.L.; Dong, Z.; Jiménez, C.; Sanchette, F. Bifunctional TiO2/AlZr Thin Films on Steel Substrate Combining Corrosion Resistance and Photocatalytic Properties. Coatings 2019, 9, 564.

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