Improving corrosion resistance of Q235 steel by Ni-Cr alloyed layer |
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| Authors: | Jun Huang Pingze Zhang Hongyan Wu Qiang Bi |
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| Affiliation: | 1. College of Materials and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
2. College of Math and Physics, Nanjing University of Information Science and Technology, Nanjing, 210044, China
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| Abstract: | Ni-Cr alloyed layer was formed on surface of Q235 steel by double glow plasma surface metallurgy to improve the corrosion
resistance of substrate. The composition and microstructure of alloyed layer was analyzed by SEM and XRD. Potentiodynamic
polarization and electrochemical impedance spectroscopy was applied to evaluate the corrosion resistance of the alloyed layer.
The results showed working pressure had a great effect on structure of Ni-Cr alloyed layer, and the dense and smooth alloyed
layer was prepared at 50 Pa working pressure. Compared with substrate, Ni-Cr alloyed layer exhibited higher corrosion potential,
lower corrosion current density and larger charge transfer resistance, which indicated that Ni-Cr alloyed layer significantly
modified the corrosion resistance of Q235 steel. |
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| Keywords: | double glow plasma surface metallurgy Ni-Cr alloyed layer potentiodynamic polarization electrochemical impedance spectroscopy corrosion resistance |
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