In:
Materials and Corrosion, Wiley, Vol. 70, No. 2 ( 2019-02), p. 187-196
Abstract:
To clarify the effect of rust on the corrosion of steel exposed to an atmosphere containing chloride, the electrochemical reduction and re‐oxidation behavior of α, β, and γ‐FeOOH is studied. Films are formed on gold electrodes and are electrochemically reduced at several potentials, thus simulating the corrosion potential under wet and dry conditions. The current flowing through the β‐FeOOH is the highest among the three films. The β‐FeOOH is reduced to Fe 3−δ O 4 at a noble potential of less than −300 mV, relative to a standard hydrogen electrode (SHE) and is reductively dissolved to Fe 2+ at a noble potential of less than −100 mV (SHE). The formed Fe 3−δ O 4 is not reformed to β‐FeOOH during re‐oxidation. It is found that the β‐FeOOH plays an important role in the cathodic reaction, acting as an oxidant, and can significantly affect the corrosion of steel in the atmosphere.
Type of Medium:
Online Resource
ISSN:
0947-5117
,
1521-4176
DOI:
10.1002/maco.201810342
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1481051-7
detail.hit.zdb_id:
1224916-6
detail.hit.zdb_id:
202688-0
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