In the present study, the surface properties and the corrosion behavior of a nanocrystalline surface layer fabricated on 45 steel by electropulsing-ultrasonic surface treatment (EUST) were investigated. EUST offered the specimen a smooth (Ra < 0.33 µm) surface layer with nanoscale grains and compressive stress by the synergistic effect of high-energy electropulsing processing and ultrasonic impact. Open-circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy studies indicated that EUST-induced surface nanocrystallization decreased the corrosion susceptibility of 45 steel in 3.5 wt% NaCl aqueous solution, leading to a decrease in corrosion current density (icorr) by 55% and an increase in charge transfer resistance (Rct) by 36%. The enhancement in surface comprehensive mechanical properties and corrosion resistance can be explained in terms of the decrease in surface roughness, the extent of grain refinement and the change of stress state, which were closely related to the introduction of high-energy electropulsing processing.
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This project is supported by Science and Technology Research Funding Project of Guangdong Province (Grant no. 2014B090901029) and Research & Development Funding Project of Shenzhen (Grant no. JCYJ20140417115840280 and CXZZ20140702113545562).
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Zhang, B., Wang, H., Zhang, S. et al. Effect of electropulsing-ultrasonic surface treatment on the surface properties and the corrosion behavior of 45 steel. Journal of Materials Research 31, 2114–2124 (2016). https://doi.org/10.1557/jmr.2016.126