Journal
MATERIALS LETTERS
Volume 335, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.133769
Keywords
Corrosion; Surfaces; Metals and alloys; Laser processing
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Fe-based alloy coatings were prepared by high-speed laser cladding (HSLC) technology. The surface was subjected to ultrasonic high-frequency percussion (UH-FP), resulting in smaller dendrites and smoother surface profile with a mirror effect. The roughness decreased from 2.643 μm to 0.913 μm and the residual stress changed from 306.92 MPa to -92.18 MPa. The UH-FP coatings exhibited higher corrosion resistance in a 3.5% NaCl solution, and the anti-corrosion mechanism was discussed based on residual stress and roughness.
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 mu m to 0.913 mu m 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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