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Failure mechanism of Q370qENH and Q355C steel oxide scale in a simulated tropical marine environment
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DOI：10.1007/s42243-026-01763-x.png)
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Abstract
En 中文
The corrosion of oxide scale on Q370qENH weathering steel and Q355C low-carbon steel within a simulated tropical marine environment was investigated. The results demonstrate that the oxide scales of both steels afforded protective effects to steel substrates at the initial corrosion stage but gradually deteriorated and ultimately failed with prolonged exposure. X-ray diffraction analysis (XRD) revealed the oxide scale composition of both steels to be magnetite (Fe3O4), hematite (α-Fe2O3), and wustite (Fe0.9O), with Q370qENH steel exhibiting a relatively lower mass fraction of Fe3O4 and a relatively higher mass fraction of Fe0.9O. The (Fe7.6Ni0.4)O6.44(OH)9.56Cl1.16 and Fe8O8(OH)8Cl1.35 were detected by XRD within the rust layers of Q370qENH and Q355C steels, respectively, with both compositions classified as akaganeite (β-FeOOH). The rust layer of Q370qENH steel contained NiO, NiFe2O4, Cr(III) oxide, FeCr2O4, and NiCr2O4. Under cyclic wet–dry conditions, the oxide scale failure time was approximately 80 d. Q370qENH steel exhibited lower corrosion mass loss, but it exhibited relatively more severe and wider-spread pitting compared to Q355C steel.
Keywords:
Weathering steel
Low-carbon steel
Oxide scale
Corrosion
Tropical marine environment
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