Abstract
(CoCrFeNi)94Ti1.5Al4.5 high entropy alloy (HEA) coatings were prepared on Q235 steel substrate by plasma cladding and plasma spraying method to investigate the effect of minor addition of Ti, Al elements and different microstructure evolution on the corrosion resistance. After 18 h of annealing at 800 °C, the microstructure of the cladded HEA coatings presented typical dendrite structure, and the precipitated phases appeared in the interdendrite region. The corrosion current densities for the cladded CoCrFeNi coating, (CoCrFeNi)94Ti1.5Al4.5 coatings without and with annealing and plasma sprayed (CoCrFeNi)94Ti1.5Al4.5 HEA coatings were 0.040, 0.166, 0.016, and 1.276 μA/cm2, respectively, while the corrosion potentials were approximately the same. The corrosion resistance of the cladded coatings was better than that of the sprayed coating. With the addition of Ti and Al elements, the passive region was broadened. The corrosion resistance was improved after annealing, whereas galvanic corrosion was easily formed between precipitates and dendrite region, which was prone to pitting corrosion.
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Acknowledgments
This work was financially supported by Natural Science Foundation of Liaoning Province (No. 2019-MS-247), Liao Ning Revitalization Talents Program (XLYC1807178) and Chinese National Natural Science Foundation (52001216).
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This article is part of a special topical focus in the Journal of Thermal Spray Technology on High Entropy Alloy and Bulk Metallic Glass Coatings. The issue was organized by Dr. Andrew S.M. Ang, Swinburne University of Technology; Prof. B.S. Murty, Indian Institute of Technology Hyderabad; Distinguished Prof. Jien-Wei Yeh, National Tsing Hua University; Prof. Paul Munroe, University of New South Wales; Distinguished Prof. Christopher C. Berndt, Swinburne University of Technology. The issue organizers were mentored by Emeritus Prof. S. Ranganathan, Indian Institute of Sciences.
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Xing, B., Zuo, X., Li, Q. et al. Influence of Microstructure Evolution on the Electrochemical Corrosion Behavior of (CoCrFeNi)94Ti1.5Al4.5 High Entropy Alloy Coatings. J Therm Spray Tech 31, 1375–1385 (2022). https://doi.org/10.1007/s11666-022-01364-6
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DOI: https://doi.org/10.1007/s11666-022-01364-6