Corrosion of mild steel at the seawater/sediments interface: Mechanisms and kinetics

Refait, Philippe; Grolleau, Anne‐Marie; Jeannin, Marc; Francois, E.; Sabot, R.

doi:10.1016/j.corsci.2017.10.016

Cited by 43 publications

(26 citation statements)

References 38 publications

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“…However, the results obtained in each site proved comparable so that general trends could be deduced. More detailed information on the exposure conditions can be found in the original articles [26,30,36,37,[40][41][42][43][44].…”

Section: Materials and Exposure Sitesmentioning

confidence: 99%

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Corrosion of Carbon Steel in Marine Environments: Role of the Corrosion Product Layer

Refait

Grolleau

Jeannin

et al. 2020

CMD

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This article presents a synthesis of recent studies focused on the corrosion product layers forming on carbon steel in natural seawater and the link between the composition of these layers and the corrosion mechanisms. Additional new experimental results are also presented to enlighten some important points. First, the composition and stratification of the layers produced by uniform corrosion are described. A focus is made on the mechanism of formation of the sulfate green rust because this compound is the first solid phase to precipitate from the dissolved species produced by the corrosion of the steel surface. Secondly, localized corrosion processes are discussed. In any case, they involve galvanic couplings between anodic and cathodic zones of the metal surface and are often associated with heterogeneous corrosion product layers. The variations of the composition of these layers with the anodic/cathodic character of the underlying metal surface, and in particular the changes in magnetite content, are thoroughly described and analyzed to enlighten the self-sustaining ability of the process. Finally, corrosion product layers formed on permanently immersed steel surfaces were exposed to air. Their drying and oxidation induced the formation of akaganeite, a common product of marine atmospheric corrosion that was, however, not detected on the steel surface after the permanent immersion period.

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Section: Materials and Exposure Sitesmentioning

confidence: 99%

“…Thirdly, some phases are electronic conductors, e.g., magnetite [32][33][34] and iron sulfides [16,23], which can favor galvanic cells. The composition of the corrosion product layer also varies with the exposure zone [26,[35][36][37][38][39][40][41][42] and may change in the long term [43].…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Carbon Steel in Marine Environments: Role of the Corrosion Product Layer

Refait

Grolleau

Jeannin

et al. 2020

CMD

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“…Corrosion in seawater causes greater destruction of the metal structure than corrosion in other aquatic environments owing to the presence of dissolved oxygen which is combined with the action of dissolved minerals, such as chloride ions. Such conditions promote the growth and propagation of different types of microorganisms living in the marine environment which then attached themselves to the metal surfaces, thereby accelerating the corrosion rate. This phenomenon is called microbiologically influenced corrosion (MIC).…”

Section: Introductionmentioning

confidence: 99%

X‐ray micro‐computed tomography analysis of accumulated corrosion products in deep‐water shipwrecks

Albahri

Barifcani

Dwivedi

et al. 2019

Materials & Corrosion

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Accumulated corrosion products from two different shipwrecks which had lain on the seabed (2.5 km depth) for 73 years were systematically analysed by three‐dimensional imaging at high resolution using X‐ray micro‐computed tomography. Complementary surface and chemical characterization experiments were conducted to identify the morphological structure of the corrosion products. Goethite was observed as the main corrosion phase found in both the wreck's corrosion products. However, other corrosion products such as silica, lepidocrocite, maghemite, magnetite, benyacarite, jarosite and amorphous materials were noticed using Fourier transform infrared spectroscopy, Raman spectroscopy and X‐ray diffraction. In addition, mineralized microbial structures were also observed as significant constituents of the corrosion products. However, there were significant differences between samples from the two shipwrecks including porosity, distribution and volume percent of the corrosion products components. The mechanism of different corrosion products formation was proposed and discussed in detail.

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“…The corrosion behavior of low alloy steel coupons was compared with that of carbon steel coupons via the combination of various electrochemical measurements, namely open circuit potential (OCP) measurements, linear polarization resistance (LPR) measurements, and electrochemical impedance spectroscopy (EIS). The corrosion product layers were thoroughly characterized by X‐ray diffraction (XRD) and µ‐Raman spectroscopy, two complementary techniques that were used successfully to precise the mechanism of marine corrosion of carbon steel in natural environments …”

Section: Introductionmentioning

confidence: 99%

Corrosion of low alloy steel in stagnant artificial or stirred natural seawater: The role of Al and Cr

Refait

Jeannin

Urios

et al. 2019

Materials & Corrosion

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Carbon steel and low alloy (containing Al and Cr) steel coupons were immersed for 6–7 months in stagnant artificial seawater or in natural marine site. The corrosion processes were studied via the combination of electrochemical techniques and the analysis of corrosion product layers by µ‐Raman spectroscopy and X‐ray diffraction. In natural seawater, the low alloy steel showed better resistance to corrosion and the best results were obtained when the mill scale was removed from the steel surface. This shows that improved corrosion resistance is due to a protective layer that forms spontaneously in the environment. In stagnant artificial seawater, the behavior of low alloy steel coupons (without mill scale) was compared with that of carbon steel coupons. The polarization resistance of the carbon steel coupons remained approximately constant over time. The corrosion product layer proved to be mainly composed of magnetite, an electronic conductor that does not hinder oxygen reduction. In contrast, the polarization resistance of the low alloy steel coupons increased with time, as the growing corrosion product layer, enriched with insulating FeOOH compounds, hindered oxygen diffusion.

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Corrosion of mild steel at the seawater/sediments interface: Mechanisms and kinetics

Cited by 43 publications

References 38 publications

Corrosion of Carbon Steel in Marine Environments: Role of the Corrosion Product Layer

Corrosion of Carbon Steel in Marine Environments: Role of the Corrosion Product Layer

X‐ray micro‐computed tomography analysis of accumulated corrosion products in deep‐water shipwrecks

Corrosion of low alloy steel in stagnant artificial or stirred natural seawater: The role of Al and Cr

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