Effect of Annealing on the Cavitation Erosion Resistance of HVOF-Sprayed Fe-Based Amorphous Composite Coatings

• Published in: Journal of thermal spray technology 2023-08, Vol.32 (6), p.1758-1771
• Main Authors: Wang, Jiewen, Yang, Rui, Tian, Ye, Zhou, Ping, Huang, Jing, Li, Hua, Chen, Xiuyong
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Machines; Manufacturing; Materials Science; Peer Reviewed; Processes; Surfaces and Interfaces; Thin Films; Tribology
• ISSN: 1059-9630; 1544-1016
• DOI: 10.1007/s11666-023-01606-1

Fe-based amorphous composite coatings were deposited onto 316L stainless steels by high-velocity oxygen-fuel spraying. Some of the coatings were annealed at 600 or 850 °C for 1 h in a vacuum. The cavitation erosion test was conducted in deionised water (DW) and artificial seawater (AS) to study the effect of annealing on the cavitation erosion resistance of the coatings. Mechanical properties and corrosion resistance were also investigated. The study revealed that the 850 °C annealed coating exhibited the best cavitation erosion resistance in both DW and AS despite compromised corrosion resistance due to the crystalline growth by annealing. The reduced porosity and increased fracture toughness of the coating after annealing at 850 °C contributed to the improved cavitation erosion resistance. In addition, the transformation of the amorphous phase to the crystalline or nanocrystalline phase was found in the as-sprayed and the 600 °C annealed coatings during cavitation erosion.