期刊
SURFACE ENGINEERING
卷 26, 期 8, 页码 562-566出版社
MANEY PUBLISHING
DOI: 10.1179/174329408X326399
关键词
Cemented carbide substrate; TiAlN multilayers; Nanostructured coatings; Corrosion
资金
- Venezuelan National Council for Science, Technology and Innovation (FONACIT) [F-2001000600, G-2000001591, CNRS 39270]
The present study has been carried out to evaluate the corrosion performance of three different (Ti1-xAlx)N/TiN multilayers coatings commercially deposited on WC-Co inserts. Two of these coatings were nanostructured, and all of them presented different Ti/Al atomic ratios varying from 2 : 3 up to 7 : 3 and were deposited by employing a commercial physical vapour deposition cathodic arc process. X-ray diffraction analysis indicated that the grain size for both the TiAlN and TiN layers in the coatings architecture, varied between approximately 9 to 14 nm. The corrosion performance was evaluated in a 3 wt-%NaCl solution using both open circuit potential and potentiodynamic polarisation measurements. Scanning electron microscopy and energy dispersive spectroscopy surface characterisation before and after corrosion testing allowed the determination that all the coatings under study show a corrosion current density of approximately one order of magnitude smaller than the uncoated substrate, indicating thus their beneficial effect from the corrosion protection viewpoint.
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