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Article

Structure, Corrosion Resistance, Mechanical and Tribological Properties of ZrB2 and Zr-B-N Coatings

Scientific-Educational Center of SHS, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
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Academic Editor: Frank Czerwinski
Metals 2021, 11(8), 1194; https://doi.org/10.3390/met11081194
Received: 29 June 2021 / Revised: 16 July 2021 / Accepted: 22 July 2021 / Published: 27 July 2021
(This article belongs to the Special Issue Corrosion without Limit: From Past to Future)
The coatings ZrB2 and Zr-B-N were deposited by magnetron sputtering of ZrB2 target in Ar and Ar–15%N2 atmospheres. The structure and properties of the coatings were investigated via scanning and transmission electron microscopy, energy dispersion analysis, optical profilometry, glowing discharge optical emission spectroscopy and X-ray diffraction analysis. Mechanical and tribological properties of the coatings were investigated using nanoindentation, “pin-on-disc” tribological testing and “ball-on-plate” impact testing. Free corrosion potential and corrosion current density were measured by electrochemical testing in 1 N H2SO4 and 3.5%NaCl solutions. The oxidation resistance of the coatings was investigated in the 600–800 °C temperature interval. The coatings deposited in Ar contained 4–11 nm grains of the h-ZrB2 phase along with free boron. Nitrogen-containing coatings consisted of finer crystals (1–4 nm) of h-ZrB2, separated by interlayers of amorphous a-BN. Both types of coatings featured hardness of 22–23 GPa; however, the introduction of nitrogen decreased the coating’s elastic modulus from 342 to 266 GPa and increased the elastic recovery from 62 to 72%, which enhanced the wear resistance of the coatings. N-doped coatings demonstrated a relatively low friction coefficient of 0.4 and a specific wear rate of ~1.3 × 10−6 mm3N−1m−1. Electrochemical investigations revealed that the introduction of nitrogen into the coatings resulted in the decrease of corrosion current density in 3.5% NaCl and 1 N H2SO4 solution up to 3.5 and 5 times, correspondingly. The superior corrosion resistance of Zr-B-N coatings was related to the finer grains size and increased volume of the BN phase. The samples ZrB2 and Zr-B-N resisted oxidation at 600 °C. N-free coatings resisted oxidation (up to 800 °C) and the diffusion of metallic elements from the substrate better. In contrast, Zr-B-N coatings experienced total oxidation and formed loose oxide layers, which could be easily removed from the substrate. View Full-Text
Keywords: magnetron sputtering; coating; ZrB2; Zr-B-N; structure; mechanical and tribological properties; corrosion and oxidation resistance magnetron sputtering; coating; ZrB2; Zr-B-N; structure; mechanical and tribological properties; corrosion and oxidation resistance
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MDPI and ACS Style

Kiryukhantsev-Korneev, P.; Sytchenko, A.; Kaplanskii, Y.; Sheveyko, A.; Vorotilo, S.; Levashov, E. Structure, Corrosion Resistance, Mechanical and Tribological Properties of ZrB2 and Zr-B-N Coatings. Metals 2021, 11, 1194. https://doi.org/10.3390/met11081194

AMA Style

Kiryukhantsev-Korneev P, Sytchenko A, Kaplanskii Y, Sheveyko A, Vorotilo S, Levashov E. Structure, Corrosion Resistance, Mechanical and Tribological Properties of ZrB2 and Zr-B-N Coatings. Metals. 2021; 11(8):1194. https://doi.org/10.3390/met11081194

Chicago/Turabian Style

Kiryukhantsev-Korneev, Philipp, Alina Sytchenko, Yuriy Kaplanskii, Alexander Sheveyko, Stepan Vorotilo, and Evgeny Levashov. 2021. "Structure, Corrosion Resistance, Mechanical and Tribological Properties of ZrB2 and Zr-B-N Coatings" Metals 11, no. 8: 1194. https://doi.org/10.3390/met11081194

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