Corrosion Resistance of Fe-Based Amorphous/Nanocrystal Coating Prepared by Arc Spraying

FeCrWNbSiB amorphous/nanocrystal coating and 1Cr18Ni9Ti coating were fabricated on 45 steel substrate by high velocity arc spraying. The microstructure of FeCrWNbSiB coating was observed by scanning electron microscopy and the phases was characterized by X-ray diffractometer. The corrosion resistance of two coatings was inspected by means of electrochemical methods. The results show that FeCrWNbSiB coating was composed of amorphous phase and α(Fe, Cr) nanocrystal phase. The volume fraction of amorphous phase in the coating was 57.2% and the average grain size of the nanocrystal was 29.2 nm. The coating with lamellar structure had porisity about 3.8%. FeCrWNbSiB amorphous/nanocrystal coating exhibited better corrosion resistance than that of 1Cr18Ni9Ti coating.