Influence of heat treatment on corrosion resistance of cold-sprayed Fe-based amorphous coatings

doi:10.13251/j.issn.0254-6051.2025.03.043

Abstract

Abstract: The Fe-based amorphous coating, Fe₇₈Si₉B₁₃, was successfully prepared on the surface of ZK60A magnesium alloy using the cold spray method. The coating was then heat-treated below its crystallization temperature (494 ℃) at different temperatures (300, 350, 400 and 450 ℃) for 30 min. The hardness, corrosion resistance and corresponding mechanisms of the coatings was investigated by using Vickers microhardness testing, electrochemical workstation and scanning electron microscope(SEM).The results show that the Fe₇₈Si₉B₁₃ coating has a dense structure, with a porosity of 2.73% and an amorphous fraction of 92.6%. The Vickers hardness of 836.2 HV0.2 is much higher than that of the magnesium alloy (68 HV0.2). In the SBF solution, the corrosion rate of the coating (0.55 mm/a) is significantly better than that of the ZK60A magnesium alloy (9.15 mm/a). After heat treatment, the corrosion resistance of the coating first increases and then decreases with the increase of heat treatment temperature. The coating treated at 350 ℃ has the best corrosion resistance, with self-corrosion potential of －0.684 V and corrosion rate of 0.26 mm/a. After soaking in SBF for 30 days, the ratio of Ca to P elements on the surface of the coating is very close to that in hydroxyapatite, indicating a certain biological activity.

Key words: cold spraying, Fe-based amorphous coating, heat treatment, corrosion resistance, ZK60A magnesium alloy

CLC Number:

TG178

Zhang Xiangyun, Ding Guoqiang, Yuan Zizhou. Influence of heat treatment on corrosion resistance of cold-sprayed Fe-based amorphous coatings[J]. Heat Treatment of Metals, 2025, 50(3): 270-276.

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