Corrosion behavior of WC-Co coatings deposited by cold gas spray onto AA 7075-T6

• Main Author: da Silva, F. S. [UNESP]
• Publication Date: 2018
• Other Authors: Cinca, N., Dosta, S., Cano, I. G., Couto, M., Guilemany, J. M., Benedetti, A. V. [UNESP]
• Format: Article
• Language: eng
• Source: Repositório Institucional da UNESP
• Download full: http://dx.doi.org/10.1016/j.corsci.2018.03.010; http://hdl.handle.net/11449/179680
• topic: Cold spray; EIS; Metal coatings; Polarization; SEM; XRD

This work reports a morphological, mechanical, and corrosion resistance characterization of WC-12Co and WC-25Co coatings deposited by cold gas spray (CGS) onto AA 7075-T6 alloy. Cross-sectional images of the coatings revealed dense structures with low porosities. The coating thicknesses were 65 μm for WC-12Co and 118 μm for WC-25Co. XRD analysis showed that no fragile phases were formed in the coatings. SEM images and electrochemical results obtained after 700 h exposure to NaCl solution showed that WC-25Co exhibited better corrosion resistance performance. The WC-12Co and WC-25Co coatings withstood 1000 and 3000 h of salt fog spray test, respectively.