Study on preparation and wear resistance and corrosion resistance of Fe-Cr-C-B-Nb surfacing alloy
In order to further improve the wear and corrosion resistance of Fe-Cr-C surfacing alloy,the Fe-Cr-C-B-Nb surfacing alloy layer was prepared by adding high carbon ferrochrome,boron carbide and ferroniobium powder to the electrode coating by shielded metal arc welding.The microstructure,wear resistance and corrosion resistance of the surfacing alloy layer were investigated by means of optical microscope,rockwell hardness tester,abrasive wear test and electrochemical corrosion test.The results showed that the microstructure of the surfacing alloy layer was mainly composed of martensite and M3(C,B)+Fe eutectic structure,and the rockwell hardness of the surfacing alloy layer could reach 66.5HRC.The results of abrasive wear test showed that the wear mass loss of the surfacing layer was 0.055 g,which was only 26.8％of the Q235 steel matrix.In w(NaCl)3.5％solution,the corrosion current density of the surfacing alloy layer was reduced by 1.59×10-7 A·cm-2 compared with the matrix,and the polarization resistance value was increased by one order of magnitude,which had good corrosion resistance.
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