Structural Features and Corrosion Resistance of Fe66Cr10Nb5B19 Metallic Glass Coatings Obtained by Detonation Spraying
In the present work, Fe 66 Cr 10 Nb 5 B 19 metallic glass coatings deposited by detonation spraying (DS) on carbon steel substrates were structurally characterized and tested in 3.5 wt.% NaCl solutions with pH values of 3.0, 5.5, and 10.0 under potentiodynamic polarization conditions. The coatings h...
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Veröffentlicht in: | Journal of materials engineering and performance 2022, Vol.31 (1), p.622-630 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In the present work, Fe
66
Cr
10
Nb
5
B
19
metallic glass coatings deposited by detonation spraying (DS) on carbon steel substrates were structurally characterized and tested in 3.5 wt.% NaCl solutions with pH values of 3.0, 5.5, and 10.0 under potentiodynamic polarization conditions. The coatings had low porosity (2.9-4.5%) and showed a predominantly amorphous structure. The concentration of an amorphous phase in the detonation coatings was 97.5-99.5 wt.%. Such high concentrations were not observed in thermally sprayed Fe-Cr-Nb-B coatings obtained by other research groups. Under the test conditions, the coatings exhibited low corrosion current densities (of the order of 10
-6
A cm
-2
) and low passive current densities (below 10
-3
A cm
-2
) while showing extended passive regions (stable within 1.5 V from the corrosion potential). The Fe
66
Cr
10
Nb
5
B
19
coatings produced by DS showed a much better corrosion resistance than the carbon steel substrate. Furthermore, the corrosion resistance of the Fe
66
Cr
10
Nb
5
B
19
DS coatings was superior to that of flame-sprayed or high-velocity oxygen fuel-sprayed Fe-Cr-Nb-B coatings reported to date. These results open new prospects for the use of affordable and Cr-lean Fe-Cr-Nb-B glassy coatings for carbon steel protection, where chloride-induced corrosion is the major degradation risk, such as metallic components for marine applications. |
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ISSN: | 1059-9495 1544-1024 |
DOI: | 10.1007/s11665-021-06143-y |