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- Title
Influence of Microstructure Evolution on the Electrochemical Corrosion Behavior of (CoCrFeNi)<sub>94</sub>Ti<sub>1.5</sub>Al<sub>4.5</sub> High Entropy Alloy Coatings.
- Authors
Xing, Bowei; Zuo, Xiaojiao; Li, Qiannan; Jin, Bingqian; Zhang, Nannan; Yin, Shuo
- 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.
- Subjects
SURFACE coatings; PLASMA spraying; PITTING corrosion; MICROSTRUCTURE; ELECTROLYTIC corrosion; CORROSION resistance
- Publication
Journal of Thermal Spray Technology, 2022, Vol 31, Issue 4, p1375
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-022-01364-6