Preparation Of High Performance Fe-Based Amorphous Coating By Resistance Seam Welding

High performance Fe-based amorphous coatings were first fabricated on 304 stainless steel by resistance seam welding. The microstructure, microhardness, wear and corrosion resistance of the coatings under different welding current were systematically studied. The coatings consisted of amorphous phase and crystalline phases of M23C6, Fe3C and alpha-Fe. Moreover, coating formation mechanism was characterized by welding temperature and microstructure variation of powders at different welding current. The dense amorphous coating was fabricated at about 750 K in welding current of 24 A and was seriously crystallized at 990 K in 30 A. The optimal hardness and wear rate of the coating reached 1280 HV0.1 and 2.71 x 10(-6) mm(3)/N.m, respectively, which exhibited better performance compared with the amorphous coating fabricated by the traditional methods. In 3.5 wt% NaCl solution, the corrosion resistance of all coatings was superior to that of the substrate, and corrosion occurred in the crystallization regions. As the welding current increased, the amorphous rate in the coating decreased, resulting in a decrease in the hardness, wear resistance and corrosion resistance of the coating.