Optimization of surface oxide chemistry for enhanced corrosion resistance of AlMnFeCoNi – Carbon nanotube composite coatings

AlMnFeCoNi high entropy alloy (HEA) composite coatings with different volume fractions of carbon nanotubes (CNTs) (from electrolyte bath with 2.5, 4, 5, 15, 17.5, 20 mg/L of CNT) were electrodeposited onto mild steel. Corrosion rate of HEA-CNT coatings exhibited non-monotonic variation with increasi...

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Veröffentlicht in:Journal of alloys and compounds 2024-10, Vol.1003, p.175766, Article 175766
Hauptverfasser: Mohan, Mansha, Singh, Sujata, Pandel, Upender, Kumar, Krishna, Srivastava, Chandan
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Sprache:eng
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Zusammenfassung:AlMnFeCoNi high entropy alloy (HEA) composite coatings with different volume fractions of carbon nanotubes (CNTs) (from electrolyte bath with 2.5, 4, 5, 15, 17.5, 20 mg/L of CNT) were electrodeposited onto mild steel. Corrosion rate of HEA-CNT coatings exhibited non-monotonic variation with increasing CNT volume fraction. Corrosion resistance initially increased and then decreased with increasing CNT addition. Highest corrosion resistance exhibited by coating produced from 5 mg/L of CNT was due to higher surface uniformity, least surface roughness (732 ± 2.92 nm), induced hydrophobicity (115.44 ± 0.29˚) and presence of stable passive oxide films (Al3+, Co2+, Fe3+). •Microstructure-corrosion property correlation explored for electrodeposited AlMnFeCoNi-CNT coatings.•Highest corrosion resistance observed at optimum CNT content of 5 mg/l.•With increasing CNT volume fraction, corrosion behaviour exhibited non-monotonic variation.•Induced hydrophobicity prevents corrosion upto optimum CNT addition further deteriorating the coating due to agglomeration.•Passive oxide films were enriched with Al3+, Co2+, Fe3+ constituents.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2024.175766