Influence of salt fog aging tests on mechanical resistance of laser clad-coatings

Abstract

NiCrBSi materials are widely used in applications where corrosion and wear resistance are required. This Ni-based alloy has been deposited onto C38 steel disc using the laser cladding technique. This paper describes the results of experiments that were performed using pin-on-disc tribometer and Knoop indentation on aging tests, for different exposure times, in a salt spray booth. Salt spray corrosion tests have shown that over 800 h of exposure, samples exhibit very high corrosion resistance. Mechanical properties, as well as wear behaviour are not affected under these conditions, due to the formation of Cr 2O 3 on the surface. However, for longer exposure (aging) time, wear behaviour was affected because of a pit distribution as well as chlorine presence on the surface. Thus, the mechanical properties deteriorated.