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2060 |
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Microstructure and electrochemical behavior of Fe-based amorphous metallic coatings fabricated by atmospheric plasma spraying |
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Zheng Zhou / College of Materials Science and Engineering, China Lu Wang / School of Materials Science and Engineering, Beijing Institute of Technology, China Fu-Chi Wang/ School of Materials Science and Engineering, Beijing Institute of Technology, China Yan-Bo Liu/ School of Materials Science and Engineering, Beijing Institute of Technology, China Ding-Yong He/ College of Materials Science and Engineering, Beijing university of Technology, China |
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A Fe48Cr15Mo14C15B6Y2 alloy with high glass forming ability (GFA) was selected to prepare amorphous metallic coatings by atmospheric plasma spraying (APS) process. The as-deposited coatings present a dense layered structure and low porosity. Microstructural studies show that some nanocrystals and a fraction of yttrium oxides were formed during spraying process, which induced the amorphous fraction of the coatings decreased to 69% comparing with fully amorphous alloy ribbons of the same component. High thermal stability employs the amorphous coatings to work below 910K temperature without crystallization. Corrosion behavior of the amorphous coating was investigated by electrochemical measurement. The results show that the coatings exhibit extremely wider passive region and lower passive current density in 3.5% NaCl and 1mol/L HCl solutions than 316L stainless steel materials, which illustrates their superior ability to resist localized corrosion. Moreover, the corrosion behavior of the amorphous coatings in 1mol/L H2SO4 solution is similar to their performance in chlorine ions contained conditions, which manifests their flexible and extensive ability to withstand aggressive environment. |