LASER CLADDING COATING AGAINST EROSION-CORROSION WEAR AND ITS APPLICATION TO MINING MACHINE PARTS

Erosion-corrosion wear is a common failure type for many mining machin e parts. This paper introduces the erosion-corrosion wear resistant, n ickel based alloy coating, which is manufactured onto AISI 1045 steel by laser cladding technology. X-ray diffraction, scanning electron mic roscopy (SEM) and microhardness testing were used to investigate the m icrostructure and hardness of the coating. After that, erosion-corrosi on wear experiments were carried out on an MSH type erosion-corrosion wear tester to study the erosion-corrosion wear characteristics of the laser clad coating. 420 stainless steel was also tested under the sam e conditions as a contrast specimen. The slurry was made up of water a nd quartz, while sulphuric acid was added to create corrosive conditio n. Experiments were arranged to test the relation between erosion-corr osion wear rate, the acid concentration and slurry erosion speed. Fina lly this gaper introduces the application of laser cladding technology to balance plates of slurry pumps used in underground mining. (C) 199 7 Elsevier Science S.A.