Abstract
Ca2SiO4 coatings with and without metallic bonding layer (NiCr) have been prepared by atmospheric plasma spraying. Microstructure and corrosion behavior of the coatings with various exposure periods in simulated seawater were investigated by means of scanning electron microscopy, energy dispersive spectrometry, potentiodynamic polarization and electrochemical impedance spectroscopy. The results revealed that the after immersion, a layer of urchin-like aragonite (CaCO3) was formed on the surface and a dense silica-rich layer was found between CaCO3 and Ca2SiO4 layer. Besides, self-sealing behavior was observed in the Ca2SiO4 layers. Compared with the immersed coatings, as-sprayed coatings exhibited the highest corrosion current densities, the lowest polarization resistance and charge transfer resistance. The presence of the metallic bonding layer slightly decreased the corrosion resistance of Ca2SiO4 coatings. The plasma-sprayed Ca2SiO4 coatings have a potential use in marine corrosive environments.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) under the Grant No. 51701235. Simultaneously, we are grateful to Prof. Shigang Xin and Prof. Yuzhi Zhang for providing the support for this work.
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Shao, F., Xiao, Y., Zhuang, Y. et al. Evolution of Microstructure and Corrosion Behavior of Plasma-Sprayed Ca2SiO4 Coatings with Exposure Periods in Simulated Seawater. J Therm Spray Tech 29, 285–296 (2020). https://doi.org/10.1007/s11666-019-00972-z
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DOI: https://doi.org/10.1007/s11666-019-00972-z