Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings
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, mechani...
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doaj-e5ae1e8d2ebe4685aae9a0db8fc4dc202020-11-24T21:18:38ZengMDPI AGCoatings2079-64122019-10-0191169510.3390/coatings9110695coatings9110695Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy CoatingsFrancesco Fanicchia0Ioana Csaki1Laura E. Geambazu2Henry Begg3Shiladitya Paul4TWI Ltd., Granta Park, Cambridge CB21 6AL, UKFaculty of Engineering, University Politehnica Bucharest, Splaiul Independentei 313, 060042 Bucharest, RomaniaFaculty of Engineering, University Politehnica Bucharest, Splaiul Independentei 313, 060042 Bucharest, RomaniaTWI Ltd., Granta Park, Cambridge CB21 6AL, UKTWI Ltd., Granta Park, Cambridge CB21 6AL, UKA 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 CoCrFeMo<sub>0.85</sub>Ni 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 CoCrFeMo<sub>0.85</sub>Ni alloy within the coating produced from the mechanically alloyed powder, opens the possibility for this powder manufacturing technique to effectively produce compositionally complex alloys.https://www.mdpi.com/2079-6412/9/11/695compositionally complex alloyhigh entropy alloycoatingthermal spraymicrostructurecorrosion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Francesco Fanicchia Ioana Csaki Laura E. Geambazu Henry Begg Shiladitya Paul |
spellingShingle |
Francesco Fanicchia Ioana Csaki Laura E. Geambazu Henry Begg Shiladitya Paul Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings Coatings compositionally complex alloy high entropy alloy coating thermal spray microstructure corrosion |
author_facet |
Francesco Fanicchia Ioana Csaki Laura E. Geambazu Henry Begg Shiladitya Paul |
author_sort |
Francesco Fanicchia |
title |
Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings |
title_short |
Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings |
title_full |
Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings |
title_fullStr |
Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings |
title_full_unstemmed |
Effect of Microstructural Modifications on the Corrosion Resistance of CoCrFeMo<sub>0.85</sub>Ni Compositionally Complex Alloy Coatings |
title_sort |
effect of microstructural modifications on the corrosion resistance of cocrfemo<sub>0.85</sub>ni compositionally complex alloy coatings |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2019-10-01 |
description |
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 CoCrFeMo<sub>0.85</sub>Ni 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 CoCrFeMo<sub>0.85</sub>Ni alloy within the coating produced from the mechanically alloyed powder, opens the possibility for this powder manufacturing technique to effectively produce compositionally complex alloys. |
topic |
compositionally complex alloy high entropy alloy coating thermal spray microstructure corrosion |
url |
https://www.mdpi.com/2079-6412/9/11/695 |
work_keys_str_mv |
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