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Corrosion behavior of electrolytic pure iron
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PRE
AI
张
G
M
L
Y
Z
T
H
DOI：10.1007/s42243-026-01883-4.png)
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Abstract
En 中文
The microstructure, inclusion morphology, corrosion resistance and evolutionary mechanisms of electrolytic pure iron are studied at different purity levels under salt-spray corrosion conditions. Electrochemical impedance spectroscopy is conducted, and potentiodynamic polarization curves are plotted and used to assess the corrosion resistance capacity of electrolytic pure iron. The results indicate that the inclusions in electrolytic pure iron primarily contain Fe–Al–O type mixed inclusions. These inclusions generally range in size from 2 to 5 μm. As the purity increases to 4N1, the number of inclusions decreases to 20, and the average ferrite grain size reduces to 4.83 μm. The distribution of columnar crystals is finer and more uniform. The corrosion rate is minimized to its lowest value (1.35 g mm−2 h−1). The enhancement in purity reduces the pit depth from 173 to 71 μm. Moreover, the rust layer thickness decreases from 111.68 to 54.62 μm. Meanwhile, the self-corrosion potential increases and the self-corrosion current decreases. At 4N1 purity, the self-corrosion potential and current are −0.5307 mV and 8.59 μA cm−2, respectively. The primary corrosion products are α-FeOOH, β-FeOOH, γ-FeOOH and Fe3O4.
Keywords:
Electrolytic pure iron
Purity
Salt-spray test
Electrochemical testing
Corrosion mechanism
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