Effect of Cu on corrosion evolution for Fe-8.5Al-30Mn-1C low-density steel: insights from bipolar electrochemistry testing

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Corrosion resistance remains unchanged despite varying Cu content in low-density steel, emphasizing the role of micro-interfaces.
Critical pitting potential (Epit) was evaluated during tests, indicating that pit initiation predominantly occurs at carbide-steel interfaces.
Bipolar electrochemistry analysis illustrated how Cu affects corrosion evolution, showing that film stability was insufficient for improved resistance.
Findings highlight the necessity for careful alloy design to develop stable and effective corrosion-resistant films in low-density steels.

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Potentio-dynamic polarization tests revealed corrosion behavior in low-density steel, suggesting Cu does not improve pitting resistance.

Zhou et al. (2025) studied this question.

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