Abstract
The amorphous coating with a new developed composition of Fe63Cr8Mo3.5Ni5P10B4C4Si2.5 has been successfully prepared by high velocity oxygen fuel technique. The amorphous coating shows good corrosion and wear resistance, which compare favourably with those of the well-known SAM1651 (Fe48Mo14Cr15Y2C15B6) and SAM2X5 (Fe49.7Cr18Mn1.9Mo7.4W1.6B15.2C3.8Si2.4) amorphous coatings despite the absence of W, and very low Cr and Mo content. The electrochemical impedance spectroscopy (EIS) and Mott–Schottky analysis reveal that under high passive potentials the passive film on the coating reflects bi-layer structure and transpassive dissolution occurs, but the film can still remain passive due to slow ionic transport under these conditions. Donor densities of the passive films on the coatings are in the order of magnitude of 1021 cm−3 which is comparable to the reported values for passive films of SAM series amorphous coatings indicating the approximate stability of the passive film. In addition, the dominating wear mechanism of Fe-based amorphous coatings is oxidation wear.
GRAPHICAL ABSTRACT
![](/cms/asset/13c47f68-5911-4bed-9ebc-f16112e2511f/ysue_a_1176718_uf0001_b.gif)
Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 51501210 and 51571207), and the Ningbo Municipal Nature Science Foundation (Grant No. 2015A610002). Particular thanks to Diana Estévez for her help with this paper.