Corrosion wear and electrochemical corrosion behaviors of laser cladded amorphous FeSiB coating in 3.5% NaCl solution

An amorphous FeSiB composite coating was fabricated on S355 structural steel using a laser cladding. The morphologies, phases and hardness of obtained coating were analyzed using a field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), and microhardness tester, respectively. The corrosion wear and electrochemical corrosion behaviors of FeSiB coating in 3.5% NaCl solution were investigated using a wear tester and electrochemical workstation. The results show that the FeSiB coating with the hardness of 601 HV is primarily composed of amorphous and crystal phases of alpha-Fe(Si) and Fe2B. The average coefficients of friction (COFs) of FeSiB coating at the wear loads of 3, 5 and 7 N loads are 0.888, 0.751, and 0.564, respectively, which deceases with the increase of wear loads; and the corresponding wear rates are 7.60, 8.02 and 10.04 mu m(3) . N-1 . m(-1), respectively. The corrosion potentials of FeSiB coating and substrate are -0.718 and -1.042 V, respectively, exhibiting that the corrosion potential of FeSiB coating shifts positively, its corrosion resistance was higher than that of substrate.