Microstructure and corrosion resistance of laser cladding FeAlCrNiSix high entropy alloy coating
FeAlCrNiSix high-entropy alloy cladding layers with different Si content were prepared on the surface of DH36 high-strength ocean structural steel by laser cladding technology to further improve the corrosion resistance of ocean structural steel.The phase composition and microstructure of the high entropy alloy cladding layer were analyzed by X-ray diffraction(XRD),optical microscope(OM)and scanning electron microscope(SEM).The microhardness of cladding layer was measured and the corrosion behavior of cladding layer was analyzed by polarization curve.The results show that the addition of Si elements can change the phase of the cladding layer from FCC+BCC phase to a single BCC phase,and the dendrite size gradually decreases and finally completely transforms into irregularly shaped equiaaxial crystals.The average hardness of the cladding layer increases first and then decreases,and the highest hardness value is 430.15HV0.1.The addition of Si element also effectively improves the corrosion resistance of the cladding layer,and the corrosion resistance of the cladding layer increases and then decreases with the increase of Si element addition.Considering the electrochemical parameters,FeAlCrNiSi0.25 cladding layer has the best corrosion resistance.
NETL
NSTL
万方数据
维普
