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Open AccessFeature PaperArticle

Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo0.85Ni Compositionally Complex Alloy Coatings

1
TWI Ltd., Granta Park, Cambridge CB21 6AL, UK
2
Faculty of Engineering, University Politehnica Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(11), 695; https://doi.org/10.3390/coatings9110695
Received: 30 August 2019 / Revised: 22 October 2019 / Accepted: 23 October 2019 / Published: 24 October 2019
(This article belongs to the Special Issue Coatings for Harsh Environments)
A compositionally complex alloy (CCA) was developed in powder form and applied as a coating onto a carbon steels substrate by using thermal spray. The purpose of this study was to investigate the effect of microstructural modification induced by using two different powder production methods, mechanical alloying and gas atomisation, onto the corrosion resistance of the coatings for a CoCrFeMo0.85Ni composition. The evolution of microstructure from powders to coatings was analysed using scanning electron microscopy coupled with energy-dispersive spectroscopy and X-ray diffraction. In order to evaluate the corrosion performance of the coatings, electrochemical corrosion tests were performed in a 3.5 wt % NaCl solution at pH = 4. The study demonstrates that the powder production method has a significant influence on the phase composition and, in turn, corrosion behaviour of the resulting coating, with the gas atomising route imparting better corrosion resistance properties. Nevertheless, the appearance of the face-centered cubic (FCC) phase characteristic of the CoCrFeMo0.85Ni alloy within the coating produced from the mechanically alloyed powder, opens the possibility for this powder manufacturing technique to effectively produce compositionally complex alloys. View Full-Text
Keywords: compositionally complex alloy; high entropy alloy; coating; thermal spray; microstructure; corrosion compositionally complex alloy; high entropy alloy; coating; thermal spray; microstructure; corrosion
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MDPI and ACS Style

Fanicchia, F.; Csaki, I.; Geambazu, L.E.; Begg, H.; Paul, S. Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo0.85Ni Compositionally Complex Alloy Coatings. Coatings 2019, 9, 695.

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