Volume 14, Issue 4 (3-2025)
مهندسی خوردگی 2025, 14(4): 82-82 |
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Shaban Sahraei A, Hajian Heidary M, Bozorg M, Soltanalizadeh R. Electrochemical Behavior of TiN/CrN Bilayer
Composite Coatings Fabricated by Cathodic
Arc Physical Vapor Deposition on High-Speed
Steel. مهندسی خوردگی 2025; 14 (4) :82-82
URL: http://journal.ica.ir/article-1-227-en.html
URL: http://journal.ica.ir/article-1-227-en.html
Assistant Professor, Department of Materials Engineering, Shahrood University of Technology & Assistant Professor, Department of Materials Engineering, Shahrood University of Technology
Abstract: (42 Views)
Hard nanocoatings such as titanium nitride (TiN) and chromium nitride (CrN) are widely used in
various industries, especially for coating cutting tools and dies, due to their unique properties including
high hardness, thermal stability, and resistance to wear and corrosion. When these coatings are applied
as multilayer composites, they exhibit significantly improved mechanical and chemical performance.
In this research, a TiN/CrN bilayer coating was applied onto a 1.3255 high-speed tool steel substrate
using the physical vapor deposition (PVD) method with a cathodic arc (Arc-PVD). Precise substrate
surface preparation and optimal coating parameter selection were carried out based on previous studies.
Grazing incidence X-ray diffraction (GIXRD) was performed to identify the crystalline structure of the
coating, and electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests
were conducted to investigate corrosion resistance. The GIXRD results indicated the successful
formation of TiN and CrN phases with a preferred crystalline orientation in the (111) plane for TiN and
the presence of slight residual stresses. Analysis of the Nyquist plots and their fitting with an equivalent
circuit showed a significant increase in polarization resistance (from 1107 Ω·cm² to 1450 Ω·cm²) and
a decrease in the double-layer capacitance, confirming the effective protective performance of the
coating. Furthermore, the polarization test results indicated a reduction in corrosion current density
(from 4.58 to 1.20 μA/cm²) and a shift in the corrosion potential towards more noble values (from -638
to -461 mV).
various industries, especially for coating cutting tools and dies, due to their unique properties including
high hardness, thermal stability, and resistance to wear and corrosion. When these coatings are applied
as multilayer composites, they exhibit significantly improved mechanical and chemical performance.
In this research, a TiN/CrN bilayer coating was applied onto a 1.3255 high-speed tool steel substrate
using the physical vapor deposition (PVD) method with a cathodic arc (Arc-PVD). Precise substrate
surface preparation and optimal coating parameter selection were carried out based on previous studies.
Grazing incidence X-ray diffraction (GIXRD) was performed to identify the crystalline structure of the
coating, and electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests
were conducted to investigate corrosion resistance. The GIXRD results indicated the successful
formation of TiN and CrN phases with a preferred crystalline orientation in the (111) plane for TiN and
the presence of slight residual stresses. Analysis of the Nyquist plots and their fitting with an equivalent
circuit showed a significant increase in polarization resistance (from 1107 Ω·cm² to 1450 Ω·cm²) and
a decrease in the double-layer capacitance, confirming the effective protective performance of the
coating. Furthermore, the polarization test results indicated a reduction in corrosion current density
(from 4.58 to 1.20 μA/cm²) and a shift in the corrosion potential towards more noble values (from -638
to -461 mV).
Keywords: TiN/CrN Bilayer Composite Coatings, cathodic arc physical vapor deposition (Arc-PVD), Electrochemical Corrosion Resistance, High-Speed Steel
Type of Study: Research |
Subject:
General
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
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