Process and performance of ultra-high-speed laser cladding corrosion-resistant layer on the surface of tungsten cathode

Abstract

Ultra-high-speed laser cladding technology is used to clad the surface anti-corrosion layer of tungsten cathode for molten salt electrolysis. Using MSC. Marc finite element simulation software, optical microscope (OM), scanning electron microscope (SEM), energy spectrum (EDS), X-ray diffractometer (XRD) and microhardness tester and other analytical testing methods, respectively, the cladding process, the cladding layer microstructure morphology, phase composition, phase distribution and microhardness are simulated, and the structure is observed and analyzed. The simulation results show that the preheating process before cladding for the tungsten substrate can effectively avoid the cracking phenomenon caused by internal stress; the structure and performance observation results show that the cladding layer has a dense structure and no cracks, forming a good metallurgical bond with the substrate, the difference in the structure of the cladding layer affects the hardness of the cladding layer.