On the Mechanism of Rust Exfoliation in Marine Environments

Morcillo, M. (author)

Chico, B. (author)

de la Fuente, D. (author)

Aicantara, J. (author)

(creator_code:org_t)

2016-12-08
2017
English.
In: Journal of the Electrochemical Society. - : ELECTROCHEMICAL SOC INC. - 0013-4651 .- 1945-7111. ; 164:2, s. C8-C16

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

Based on exposures in chloride-rich field and laboratory atmospheres, a mechanism of rust exfoliation of carbon steel is proposed. Key ingredients are structural transformations between main rust phases (goethite, lepidocrocite, spinel oxides and akageneite) during varying exposure conditions and their large difference in molar volume with a factor of five between the most compact and least compact rust phase. Akaganeite transformed to spinel results in volume contraction, lepidocrocite to spinel in volume expansion and in both cases stresses are introduced in the rust multilayer. At sufficiently high chloride deposition rates (similar to 300 mg/m(2).d), the rust multilayer eventually detaches resulting in rust exfoliation.

By the author/editor: Morcillo, M.; Chico, B.; de la Fuente, D.; Aicantara, J.; Odnevall Wallind ...; Leygraf, Christo ...

About the subject

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