Corrosion Behavior of Arc Sprayed Nickel-Base Coatings |
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Authors: | Dingyong He Na Dong Jianmin Jiang |
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Affiliation: | (1) College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100022, China;(2) The Shanghai Lincoln Electric Co., Ltd, Shanghai, 201907, China |
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Abstract: | In this study, nickel-base cored wires were prepared by using NiCr strip to wrap metal powders of nickel (Ni), chromium (Cr),
molybdenum (Mo), and chromium boron (CrB). Nickel-base coatings were prepared by electric arc spraying. Microstructures of
Ni-Cr-Mo and Ni-Cr-B coatings were investigated using scanning electron microscopy (SEM), energy-dispersive analysis (EDAX),
and x-ray diffraction (XRD) analysis. The coatings have a compact surface and presented a bonding strength higher than 40 MPa.
Potentiodynamic polarization measurements and salt-spray test were carried out to determine the corrosion behavior of the
coatings. The results showed that Ni-base coatings containing Mo (5%) or B (2-4%) had better antichlorine ion corrosion performance
than that of Ni-base coatings without Mo element, and PS45 (Ni-Cr-Ti) coating. The antichlorine ion corrosion coatings could
be used for resolving the corrosion protection problem of the equipment and piping contacting sour, alkali, salt liquid in
petrochemical engineering applications.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. |
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Keywords: | arc spraying cored wire corrosion behavior nickel-base coating |
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