Effects of Al and Ti additions on corrosive–wear and electrochemical behaviors of laser cladded FeSiB coatings

Abstract

FeSiB, FeSiBAl and FeSiBTi coatings were fabricated on S355 steel using a laser cladding (LC). The surface and cross–section morphologies, chemical elements and phases of obtained coatings was analyzed using a scanning electron microscope (SEM), energy dispersive spectroscope (EDS), X–ray diffraction (XRD), respectively, the chemical valences were characterized using an X–ray photoelectron spectrometer (XPS), and the effects of Al and Ti additions on the corrosive–wear and electrochemical behaviors were analyzed using a corrosive–wear tester and electrochemical workstation, respectively. The results show that the amorphous contents of laser cladded FeSiB, FeSiBAl and FeSiBTi coatings are 7.27, 8.12, and 9.81%, respectively, and the corresponding wear rates are 76.6, 43.3, and 70.9 μm3·N−1·mm−1, respectively, the wear mechanism primary abrasive wear, accompanying by fatigue wear. The corrosion current densities of FeSiB, FeSiBAl and FeSiBTi coatings are 9.33 × 10−6, 5.54 × 10−6, and 5.05 × 10−5 A·cm−2, respectively, the addition of Al improves the corrosive–wear and electrochemical corrosion resistance, while that of Ti has little effect on the corrosive–wear, only reduces the electrochemical corrosion resistance.