Abstract
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.
Highlights
Fe-based amorphous/nanocrystalline coatings are widely used in the oil and gas industry, building industry, biomedical implants and so on
The applications of the Fe-based amorphous/nanocrystalline coatings are often restricted by the low crystallization temperature
The results showed that reinforced particles obviously improved the microhardness and anti-wear performances of the Fe-based amorphous/nanocrystalline coating [12,13,14,15,16]
Summary
Fe-based amorphous/nanocrystalline coatings are widely used in the oil and gas industry, building industry, biomedical implants and so on. Fe-based amorphous/nanocrystalline coatings have caused great attention due to their high corrosion resistance, outstanding anti-wear performances, excellent microhardness and low cost [1,2,3]. The applications of the Fe-based amorphous/nanocrystalline coatings are often restricted by the low crystallization temperature. The results from Guo et al [9] showed that the average Vickers hardness of Fe–Cr–Nb–B amorphous/nanocrystalline coatings reach 890 ± 75 HV. In order to enhance the microhardness and anti-wear performances of the Fe-based amorphous/nanocrystalline coatings, some scholars add reinforcement particles, such as Al2 O3 , WC, TiN and so on into the coatings
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