In this work, three kinds of Cr-based nitride coatings such as monolithic CrN, CrSiN coatings, and multilayered coating with bilayer period of were deposited on both Si (100) wafer and AISI H13 steel substrates by unbalanced magnetron sputtering. Thermal stability of these coatings was evaluated by annealing the coatings at temperatures between 600 and for in air. In addition, the corrosion behaviors of these coatings were investigated by potentiodynamic polarization tests in a deaerated NaCl solution at . Results from annealing test show the monolithic CrN and CrSiN coatings were completely oxidized after annealed at 800 and , and their cross sectional images and atomic force microscopy showed a loose and very porous morphology due to the oxidation. Also, the hardness values of the monolithic CrN and CrSiN coatings were decreased significantly from 22 and to 8 and , respectively. However, the multilayered coating still exhibited a dense microstructure without visible change after annealed at , and moreover, the relatively high hardness of was maintained. The superior thermal stability of the multilayer coating could be attributed to the formation of the dense and stable oxidation barrier consisted of the , , and amorphous phases near the surface region, which retard the diffusion of oxygen into the coating. In the potentiodynamic polarization test results, it was found that the significantly improved corrosion resistance of the multilayered coating was observed in comparison with those from the monolithic CrN and CrSiN coatings, and its corrosion current density and protective efficiency were measured to be approximately and 95%, respectively.
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July 2009
Research Article|
June 29 2009
Comparative studies on the thermal stability and corrosion resistance of CrN, CrSiN, and coatings
Gwang Seok Kim;
Gwang Seok Kim
a)
Department of Materials Engineering, NRL for Cracking Control and Management,
Korea Aerospace University
, Hangkongdae-Gil 100, KoYang-Si, KyungKi-Do 412-791, South Korea
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Sung Min Kim;
Sung Min Kim
Department of Materials Engineering, NRL for Cracking Control and Management,
Korea Aerospace University
, Hangkongdae-Gil 100, KoYang-Si, KyungKi-Do 412-791, South Korea
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Sang Yul Lee;
Sang Yul Lee
b)
Department of Materials Engineering, NRL for Cracking Control and Management,
Korea Aerospace University
, Hangkongdae-Gil 100, KoYang-Si, KyungKi-Do 412-791, South Korea
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Bo Young Lee
Bo Young Lee
NRL for Cracking Control and Management, Faculty of Mechanical and Aerospace Engineering,
Korea Aerospace University
, Hangkongdae-Gil 100, KoYang-Si, KyungKi-Do 412-791, South Korea
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J. Vac. Sci. Technol. A 27, 873–879 (2009)
Article history
Received:
October 01 2008
Accepted:
May 26 2009
Citation
Gwang Seok Kim, Sung Min Kim, Sang Yul Lee, Bo Young Lee; Comparative studies on the thermal stability and corrosion resistance of CrN, CrSiN, and coatings. J. Vac. Sci. Technol. A 1 July 2009; 27 (4): 873–879. https://doi.org/10.1116/1.3155396
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