Electrochemical Properties of TiWN/TiWC Multilayer Coatings Deposited by RF-Magnetron Sputtering on AISI 1060
| Autor: | Andrés González-Hernández, Cesar Amaya, Ana Beatriz Morales-Cepeda, William Aperador, Julio C Caicedo, M. Flores |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
bilayer
Materials science Scanning electron microscope 02 engineering and technology engineering.material 01 natural sciences Corrosion X-ray photoelectron spectroscopy Coating Sputtering monolayer 0103 physical sciences Materials Chemistry Composite material 010302 applied physics corrosion Surfaces and Interfaces Sputter deposition Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Dielectric spectroscopy engineering TA1-2040 forty-periods hard coatings 0210 nano-technology |
| Zdroj: | Coatings Volume 11 Issue 7 Coatings, Vol 11, Iss 797, p 797 (2021) |
| ISSN: | 2079-6412 |
| DOI: | 10.3390/coatings11070797 |
| Popis: | Nitride and carbide ternary coatings improve the wear and corrosion resistance of carbon steel substrates. In this work, Ti-W-N and Ti-W-C coatings were deposited on AISI 1060 steel substrates using reactive radio frequency (RF) magnetron sputtering. The coatings were designed as monolayers, bilayers, and multilayers of 40 periods. The coatings were obtained with simultaneous sputtering of Ti and W targets. The microstructure, composition, and electrochemical properties were investigated by techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization. XRD results shower a mix of binary TiN and W2N structures in the Ti-W-N layer, a ternary phase in Ti-W-C layers, in addition of a quaternary phase of Ti-W-CN in the multilayers. The analysis of the XPS demonstrated that the atomic concentration of Ti was more significant than W in the Ti-W-N and Ti-W-C layers. The lowest corrosion rate (0.19 mm/year−1) and highest impedance (~10 kΩ·cm2) out of all coatings were found in n = 40 bilayers. In the simulation of equivalent electrical circuits, it was found that the Ti-W-N coating presented three processes of impedance (Pore resistance + Coating + Inductance). However, the multilayer (n = 40) system presented a major dielectric constant through the electrolyte adsorption therefore, this caused an increase in the capacitance of the coating. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|