Mechanical Property and Corrosion Resistance Characterization of Supersonic Particle Deposition (SPD) AlCrNi Coatings on S235JR Steel Before and After Laser Remelting
J-N. Huang, J. Tang, C-J. Zhu and X. Yan
An AlCrNi coating prepared by supersonic particle deposition (SPD) on a S235JR structural steel substrate was remelted using a Nd:YAG laser. The bond strength was assessed and the corrosion resistance of the coating was performed. The results show that the Al, Ni, Cr and Fe in the AlCrNi SPD coating after laser remelted were not only mutually diffused, but also combined to form new phases AlCrFe2 and AlFe3. The elastic modulus showed that the SPD AlCrNi coating after laser remelting under a power of 800 W had an excellent bonding strength. As the distance from AlCrNi coating surface increased, the microhardness showed a slowly decreasing trend. The AlCrNi SPD coating after laser remelting had the highest microhardness of approximately 744 kgf/mm2. The corrosion tendency of the AlCrNi SPD coating after laser remelting under a power of 800 W showed improved electrochemical corrosion performance.
Keywords: Nd:YAG laser, S235JR steel, AlCrNi coating, supersonic particle deposition (SPD), laser remelting, bond strength, microhardness, corrosion potential