Corrosion and high-temperature tribological behavior of carbon steel claddings by additive manufacturing technology

摘要

High-speed steel (HSS), traditionally used in the hot rolling industry, suffers from the problem of wear and corrosion. The integral changing of HSS, however, is expensive. For modifying the surface property of metal materials, submerged arc welding, among the industrial additive manufacturing technologies, is employed. In this study, we aim at improving the resistance of carbon steel cladding against corrosion and wear. To reduce cost, the HSS matrix is replaced by carbon steel. Electrochemical corrosion and high-temperature dry sliding wear experiments are implemented to study the corrosion and tribological behavior of HSS and surface-modified claddings. The wear and corrosion behaviors are characterized by potentiodynamic polarization, electrochemical impedance spectroscopy, wear rate, coefficient of friction, and worn surface morphology. The experimental results indicate that the corrosion current density (I-corr) of carbon steel claddings, ranging from 11.023 x 10(-3) to 3.372 x 10(-3) mA.cm(-2), is lower than that of the HSS alloy (19.247 x 10(-3) mA.cm(-2)). The passive film resistance of prepared carbon steel cladding-3 (1870 Omega.cm(2)) is in fact larger than the resistance of HSS (1075 Omega.cm(2)). The corrosion resistance of surface-modified carbon steel claddings is better than that of the HSS. The wear rates of carbon steel cladding-2 (1.99 x 10(-7) mm(3).N-1.mm(-1)) and carbon steel cladding-3 (2.49 x 10(-7) mm(3).N-1.mm(-1)) approximate the wear rate of HSS (1.59 x 10(-7) mm(3).N-1.mm(-1)). Moreover, the wear width of prepared carbon steel cladding-3 (550 mu m) is slightly larger than that of HSS (500 mu m). The wear resistance of carbon steel cladding-3 approximates that of HSS.