STUDY ON MICROSTRUCTURE AND CORROSION RESISTANCE OF LASER CLADDING FE BASED ALLOY COATING
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Abstract
In order to improve the corrosion resistance of 45 steel surface, fe-based alloy coating was prepared on the surface of 45 steel by laser cladding technology and the microstructure of Fe-based alloy coating was observed.Corrosion resistance test of Fe-based alloy coating and 45 steel in 3.5wt.% NaCl solution and 1mol/L HCl solution.The results show that the coating structure of the laser cladding Fe-based alloy is uniformly dense, and there are no obvious cracks, porosity and other defects on the surface of the coating.The self-corrosion potential (Ecorr) of the coating and 45 steel in 3.5wt.% NaCl solution was -570.96mV and -831.15mV, and the self-corrosion current density (icorr) was 12.13uA·cm-2 and 13.70uA·cm-2, respectively.The Ecorr of the coating and 45 steel in the 1mol/L HCl solution were -453.45mV and -497.00mV, respectively, and the icorr of the coating and 45 steel was 297.78uA·cm-2 and 379.31uA·cm-2, respectively.The coating has a greater arc capacitive than 45 steel, has a larger impedance modulus, and has better corrosion resistance.
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