<p>This study investigates the phase evolution, crystallization behavior, hardness, and corrosion resistance of Fe-based amorphous coatings prepared using high-speed laser cladding technology under different crystallization rates through accelerated aging treatment. Non-isothermal crystallization kinetic analysis demonstrates that this crystallization process is a thermally activated one and is correlated with the heating rate. Among these parameters, the glass transition temperature (<i>T</i>_<i>g</i>) and the initial crystallization temperature (<i>T</i>_<i>x1</i>) are relatively insensitive to the heating rate, while the exothermic transition at the second crystallization peak shows a higher sensitivity to the heating rate. When the temperature is below <i>T</i>_<i>g</i>, the amorphous phase structure remains stable. Within the temperature range between <i>T</i>_<i>g</i> and <i>T</i>_<i>x1</i>, although a part of the amorphous structure is disrupted, the coating still exhibits three exothermic peaks similar to those of the untreated coating. When the temperature exceeds <i>T</i>_<i>x1</i>, the amorphous phase transforms into M₂₃(B,C)₆ and Fe₃Mo₃C phases, and at this point, only two exothermic peaks appear in the coating. At an accelerated aging treatment temperature of 873&#xa0;K, the amorphous phase undergoes crystallization, and metastable phases or microcrystals are uniformly distributed, which leads to an improvement in the hardness of the coating. However, as the aging treatment temperature increases, the content of the amorphous phase decreases, resulting in varying degrees of increase in the crystallinity of the cladding layer after the accelerated failure test. Meanwhile, both the effective capacitance (<i>CPE</i>_<i>f</i><i>-T</i>) and the double-layer capacitance (<i>CPE</i>_<i>dl</i><i>-T</i>) increase, and the corrosion resistance of the cladding layer decreases significantly.</p>