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Influence of Different Heat Treatment Temperatures on the Microstructure, Corrosion, and Mechanical Properties Behavior of Fe-Based Amorphous/Nanocrystalline Coatings

School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China
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Coatings 2019, 9(12), 858; https://doi.org/10.3390/coatings9120858
Received: 13 November 2019 / Revised: 5 December 2019 / Accepted: 11 December 2019 / Published: 14 December 2019
Fe-based amorphous/nanocrystalline coatings with smooth, compact interior structure and low porosity were fabricated via supersonic plasma spraying (SPS). The coatings showed outstanding corrosion resistance in a 3.5% NaCl solution at room temperature. In order to analyze the effect of annealing treatment on the microstructure, corrosion resistance and microhardness, the as-sprayed coating was annealed for 1 h under different temperatures such as 350, 450, 550 and 650 °C, respectively. The results showed that the number of oxides and cracks in the coatings presented an obvious increase with increasing annealing temperature, and the corrosion resistance of the coatings showed an obvious reduction. However, the microhardness of coatings showed an important increase. The microhardness of the coating could reach 1018 HV when the heat treatment temperature reached 650 °C. The X-ray diffraction (XRD) results showed that there appeared a number of crystalline phases in the coating when the heat treatment temperature was at 650 °C. The crystalline phases led to the increase of the microhardness. View Full-Text
Keywords: Fe-based amorphous/nanocrystalline coatings; microstructure; corrosion resistance; heat treatment Fe-based amorphous/nanocrystalline coatings; microstructure; corrosion resistance; heat treatment
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Liu, S.; Zhu, Y.; Lai, X.; Zheng, X.; Jia, R.; Yuan, X. Influence of Different Heat Treatment Temperatures on the Microstructure, Corrosion, and Mechanical Properties Behavior of Fe-Based Amorphous/Nanocrystalline Coatings. Coatings 2019, 9, 858.

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