The microstructure of FeCrNiCoMoBSi high entropy alloy(HEA)laser cladding coating and the effects of la-ser power on the phase and electrochemical corrosion properties of the coating were investigated.The results show that the HEA coating is composed of columnar crystal band at the bottom,equiaxed crystal band at the top and mixed crystal band in the middle(composed of columnar crystal and equiaxed crystal).The HEA coating prepared at 3000 W exhibits the lowest self-corrosion current density(0.425 μA/cm2),the highest self-corrosion potential(-0.16852 V)and the largest polarization impedance(69 616 Ω).Its impedance modulus is 1 143 Ω·cm2,which is 8.65 times,4.91 times and 7.14 times of the laser cladding coatings prepared at 1 800 W,2 500 W and 4 500 W,respectively,as well as its maxi-mum phase angle is 76.23°,which is higher than the other three coatings.The comprehensive evaluation shows that the HEA coating prepared at 3000 W exhibits excellent electrochemical corrosion performance.This is due to its single FCC crystal structure,corrosion-resistant Fe-Ni alloy phase and elemental chromium phase,good crystal crystallinit,fine grain size and excellent passivation effect,making its electrochemical corrosion performance significantly superior to oth-er power prepared coatings.
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