Abstract
Fe-based alloy coatings were prepared by high-speed laser cladding (HSLC) technology, and the surface was subjected to ultrasonic high-frequency percussion (UH-FP). The dendrites at the top of the coatings were smaller, and there was dendrite segregation. After UH-FP, the surface profile of the coatings was smoother, achieving the mirror effect. The roughness decreased from 2.643 μm to 0.913 μm and the residual stress of the coatings changed from 306.92 MPa to −92.18 MPa. The electrochemical corrosion behavior in a 3.5 % NaCl solution indicates that the UH-FP coatings exhibit higher corrosion resistance. Anti-corrosion mechanism was discussed based on residual stress and roughness.
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