Effect of Current Density on Electrodeposited Fe-W Alloy Coating on Red Copper

Compact Fe-W amorphous alloy coating with a high content of W and high hardness was electrodeposited on copper surface.The morphology,microstructure and composition of the alloy coating were analyzed by means of scanning electron microscopy,X-ray diffraction and energy dispersive spectrometry,and the microhardness of the Fe-W alloy coating was also determined.It was found that the Fe-W alloy coatings obtained under different current densities,with thicknesses of 10~100 μm,had amorphous structure and consisted of spherical grains.The amounts of pores in the alloy coatings increased with the increase of current density,and the contents of W in the coatings reached 57%~61%(mass fraction).The highest current efficiency was reached at a current density of 10 A/dm2,and corresponding Fe-W alloy coating contained less amount of pores and had the highest microhardness of 681 HV.Beyond a current density of 10 A/dm2,the microhardness of the alloy coating decreased with increasing current density.