Journal of Thermal Spray Technology

, Volume 26, Issue 8, pp 2040–2047 | Cite as

Passivation Behavior of Fe-Based Amorphous Coatings Prepared by High-Velocity Air/Oxygen Fuel Processes

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Abstract

Corrosion resistance and passivation behavior of Fe63Cr8Mo3.5Ni5P10B4C4Si2.5 amorphous coatings prepared by the activated combustion high-velocity air fuel (AC-HVAF) and high-velocity oxygen fuel (HVOF) processes have been studied in detail by cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, cathodic polarization and Mott–Schottky approach. The AC-HVAF coating shows higher corrosion resistance than the HVOF coating in 3.5 wt.% NaCl solution, as evidenced by its lower corrosion current density and passive current density. It is found that the superior corrosion resistance of the AC-HVAF coating is attributed to the enhanced formation of a dense passive film with less defective structure, higher pitting resistance and passivity stability, as well as stronger repassivity.

Keywords

amorphous metals coatings corrosion electrochemical characterization microstructure 
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Notes

Acknowledgments

Financial support is from National Natural Science Foundation of China (Grant Nos. 51501210 and 51571207) and Ningbo Municipal Nature Science Foundation (Grant No. 2017A610034). The authors would like to thank J. Shen and H. Li for technical assistance.

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Copyright information

© ASM International 2017

Authors and Affiliations

  1. 1.Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina
  2. 2.Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina
  3. 3.Laboratory for MicrostructuresShanghai UniversityShanghaiChina

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