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<p>This study systematically investigates the impact of copper (Cu) incorporation on the microstructure and corrosion resistance of newly developed ferritic stainless-steel alloys in NaCl environment. The study has utilized conventional advanced microelectrochemical techniques such as scanning electrochemical microscopy (SECM), to gain detailed insights into localized corrosion characteristics of Fe-20Cr-xCu (<i>x</i> = 0, 2, 4&#xa0;wt.%) alloys. Potentiodynamic polarization (PDP) analysis revealed that Fe-20Cr-2Cu alloy exhibited more noble <i>E</i><sub>corr</sub> (− 215.55&#xa0;mV versus SCE )<sub>,</sub> lowest <i>i</i><sub>corr (</sub>0.0069&#xa0;<b>µA&#xa0;cm</b><sup><b>− 2</b></sup>), lowest <i>i</i><sub>pass</sub> (0.0001&#xa0;<b>A&#xa0;cm</b><sup><b>− 2</b></sup><b>)</b> and highest pitting potential (23.658&#xa0;mV versus SCE), indicating its enhanced corrosion resistance. Dynamic EIS measurements confirmed the enhanced electrochemical stability of the Fe-20Cr-2Cu alloy, suggesting the growth of a dense and robust passive layer. Scanning electrochemical microscopy (SECM) results further confirmed the sustained stability of this alloy after 24&#xa0;hr. exposure, revealing a uniform surface with minimal heterogeneity. The obtained results corroborate that the addition of 2&#xa0;wt.% Cu is the optimal alloying concentration for improving the corrosion resistance of newly developed Fe-20Cr-xCu alloys.</p>

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Unraveling the Role of Copper on the Corrosion Behavior of Fe-20Cr-xCu Alloys in 3.5% NaCl Solution

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Yahya Ahmed,
  • A. Madhan Kumar,
  • Muhammad Younas,
  • Ihsan-ul-Haq Toor

摘要

This study systematically investigates the impact of copper (Cu) incorporation on the microstructure and corrosion resistance of newly developed ferritic stainless-steel alloys in NaCl environment. The study has utilized conventional advanced microelectrochemical techniques such as scanning electrochemical microscopy (SECM), to gain detailed insights into localized corrosion characteristics of Fe-20Cr-xCu (x = 0, 2, 4 wt.%) alloys. Potentiodynamic polarization (PDP) analysis revealed that Fe-20Cr-2Cu alloy exhibited more noble Ecorr (− 215.55 mV versus SCE ), lowest icorr (0.0069 µA cm− 2), lowest ipass (0.0001 A cm− 2) and highest pitting potential (23.658 mV versus SCE), indicating its enhanced corrosion resistance. Dynamic EIS measurements confirmed the enhanced electrochemical stability of the Fe-20Cr-2Cu alloy, suggesting the growth of a dense and robust passive layer. Scanning electrochemical microscopy (SECM) results further confirmed the sustained stability of this alloy after 24 hr. exposure, revealing a uniform surface with minimal heterogeneity. The obtained results corroborate that the addition of 2 wt.% Cu is the optimal alloying concentration for improving the corrosion resistance of newly developed Fe-20Cr-xCu alloys.