Corrosion behavior of Ti-Cr-N coatings on tool steel substrates prepared using DC magnetron sputtering at low growth temperatures
| Autor: | Patama Visuttipitukul, Gobboon Lothongkum, Kattareeya Taweesup, Niti Yongvanich |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology Surfaces and Interfaces General Chemistry Electrolyte Penetration (firestop) engineering.material Sputter deposition 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surfaces Coatings and Films Corrosion Dielectric spectroscopy Coating 0103 physical sciences Tool steel Materials Chemistry engineering Composite material 0210 nano-technology Porosity |
| Zdroj: | Surface and Coatings Technology. 358:732-740 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2018.11.082 |
| Popis: | In this research, Ti-Cr-N coatings on tool steel were prepared using DC magnetron sputtering at 25 °C (RT), 130 °C and 190 °C. Coating corrosion behavior was observed in a 3.5% NaCl solution at 25 °C using Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS). EIS circuit models for corrosion kinetics were proposed and the surface area and porosity of the coatings were recorded. Corrosion resistance was found to be higher for the coatings grown at 190 °C. This could be attributed to high density as well as low porosity. The EIS circuit model suggests the penetration of corrosive electrolytes into pores reaching the steel substrate for the coatings grown at RT. Finite length diffusion inside pores was also observed. The slow infiltration of corrosive electrolytes into the steel substrate could be seen in coatings grown at 130 °C with diffusion inside the pore similar to that in the coatings grown at RT. However, the EIS circuit model did not exhibit a finite length diffusion of the coatings grown at 190 °C. Owing to high coating density and smaller pore size, corrosive electrolytes could hardly penetrate through and reach the steel substrate. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect