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<p>This systematic investigation evaluates the corrosion enhancement mechanisms of surface-treated 443 ferritic stainless steel through multi-modal characterization. Combining electrochemical polarization, accelerated immersion testing (3.5&#xa0;wt.% NaCl solution, 25 ± 1&#xa0;°C), and Kelvin Probe Force Microscopy (KPFM) analysis, the No.4 frosted surface was found to exhibit superior corrosion resistance compared with conventional 2B finish. Electrochemical parameters analysis revealed a 11.9% increase in pitting potential (378.78 versus 338.60&#xa0;mV<sub>SCE</sub>), coupled with a 34.3% lower corrosion rate (0.00611 versus 0.00930&#xa0;mm/y) and a 5.8% reduction in HCl-induced mass loss (0.1326 versus 0.1407&#xa0;g). KPFM shows that the No. 4 surface possesses a higher contact potential, lower roughness, and greater work function (4.958 ± 0.2 versus 4.841 ± 0.2&#xa0;eV), reflecting stronger electron binding ability. The anti-corrosion improvement stems from synergistic effects of surface topology modification and electron cloud densification. These findings establish a surface engineering protocol correlating macroscopic corrosion resistance with atomic-scale electronic structure modulation.</p>

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The Impact of Surface Treatment on the Corrosion Resistance of 443 Ferritic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Huihua Guo,
  • Zhonghe Liu,
  • Yong Wang,
  • Jingyuan Li

摘要

This systematic investigation evaluates the corrosion enhancement mechanisms of surface-treated 443 ferritic stainless steel through multi-modal characterization. Combining electrochemical polarization, accelerated immersion testing (3.5 wt.% NaCl solution, 25 ± 1 °C), and Kelvin Probe Force Microscopy (KPFM) analysis, the No.4 frosted surface was found to exhibit superior corrosion resistance compared with conventional 2B finish. Electrochemical parameters analysis revealed a 11.9% increase in pitting potential (378.78 versus 338.60 mVSCE), coupled with a 34.3% lower corrosion rate (0.00611 versus 0.00930 mm/y) and a 5.8% reduction in HCl-induced mass loss (0.1326 versus 0.1407 g). KPFM shows that the No. 4 surface possesses a higher contact potential, lower roughness, and greater work function (4.958 ± 0.2 versus 4.841 ± 0.2 eV), reflecting stronger electron binding ability. The anti-corrosion improvement stems from synergistic effects of surface topology modification and electron cloud densification. These findings establish a surface engineering protocol correlating macroscopic corrosion resistance with atomic-scale electronic structure modulation.