Microstructure and corrosion resistance of warm sprayed titanium coatings with polymer sealing for corrosion protection of AZ91E magnesium alloy

Thermally sprayed coatings are one of the potential ways to increase corrosion performance of Mg alloys dedicated for aircraft applications. In our research, a novel thermal spray process called Warm Spraying (WS) was used to deposit Ti coatings onto AZ91E magnesium alloy. WS gives us the possibilit...

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Bibliographic Details
Published in:Surface & coatings technology 2019-04, Vol.363, p.142-151
Main Authors: Morończyk, B., Ura-Bińczyk, E., Kuroda, S., Jaroszewicz, J., Molak, R.M.
Format: Article
Language:English
Subjects:
Corrosion potential
Corrosion prevention
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Flow velocity
Magnesium alloys
Magnesium base alloys
Microstructure
Oxygen content
Porosity
Protective coatings
Sprayed coatings
Spraying
Substrates
Titanium base alloys
Titanium coatings
Warm spraying
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Summary:Thermally sprayed coatings are one of the potential ways to increase corrosion performance of Mg alloys dedicated for aircraft applications. In our research, a novel thermal spray process called Warm Spraying (WS) was used to deposit Ti coatings onto AZ91E magnesium alloy. WS gives us the possibility to control the temperature of the sprayed particles by changing the nitrogen flow rate (NFR) what as a result determine the porosity of WS coatings. The microstructure, porosity and oxygen content of coatings deposited under three different NFR was determined. A relation between porosity, oxygen content and NFR was revealed. The corrosion testing in 3.5% NaCl solution of as-sprayed coatings revealed their poor corrosion resistance that led to fast degradation of the substrate. The following post-treatment with epoxy-based polymer resulted in a significant improvement of the corrosion performance of Ti warm sprayed coatings. •Titanium warm sprayed coatings for corrosion protection•Improvement of corrosion resistance with post-treatment•Over 1000 h protection of Mg based substrate provided by Ti warm sprayed coating combined with epoxy-based sealing
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2019.02.023