Influence des éléments d’alliage sur la corrosion d’aciers faiblement alliés en eau de mer naturelle

Dajoux, E.; Malard, Stéphane; Lefèvre, Yan; Kervadec, Dominique; Gil, O.

doi:10.1051/mattech:2006006

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…In terms of the stabilized value of free potential, the obtained results seem to be in good accordance with those found by Dajoux et al [17] when studying the evolution of the steel corrosion potential in marine environments.…”

Section: Open-circuit Potential Monitoringsupporting

confidence: 90%

“…As reported in the literature [17,18], two patterns of OCP evolution were generally observed: (i) the potential readings decreased at the beginning showing the metal corrosion by dissolution, (ii) the free potential readings initially increased revealing the passivating tendency of the metal. However, based on the literature [13,19,20], R p is the best indicator of the overall rate of electrochemical activity on the metal surface since the OCP is affected by several factors.…”

Section: Introductionsupporting

confidence: 72%

“…Quantitatively, the corrosion behaviour was also discussed in terms of weight loss during immersion time [16,17,21]. Generally, there was a continuous dissolution of the corroded material and in this case the metal does not show passive behaviour (in the presence of Cl À ) [6].…”

Section: Introductionmentioning

confidence: 99%

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Susceptibility to corrosion damage of pipeline steels under coating disbondments

Guermazi¹,

Ibrahmi²,

Hmidi³

et al. 2010

Materials & Corrosion

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This study provides an experimental investigation on the corrosion behaviour of three carbon steels used for pipeline application. The susceptibility of these materials to corrosion damage was analysed in order to simulate its service conditions particularly under disbonded coating. Monitoring of open-circuit potential (E free ), polarization resistance (R p ) and measuring of the weight loss during immersion time were used to evaluate the corrosion behaviour of the studied materials. All the corrosion experiments were performed in two aqueous solutions: natural seawater and synthetic one (3 wt% NaCl solution). The morphology of the corrosion products was examined by optical microscopy. The results obtained from electrochemical tests have shown different behaviour for the studied steels into the retained corrosive environments: more stable potentials (E free ), higher R p -values with large fluctuations evolution were found in natural seawater. The gravimetric measurements have also shown a continuous variation of the weight loss throughout the exposure period in the sodium chloride solution. However, it seemed that a passive behaviour was observed in natural seawater. A little difference was observed between all the studied steels in terms of corrosion kinetics. The steel, having the little ferritic grain size, seems to be more resistant to corrosion damage. Qualitatively, a porous and non-adherent oxide film was observed on the corroded surface in the synthetic solution; while, the rust layer, which is formed in the natural seawater, has acted as a barrier of corrosion process. Finally, all the results obtained from both electrochemical tests and weight loss measurements were in reasonably good accordance. The important common point that can be concluded was that all the tested materials seem to be more suitable for natural seawater than 3 wt% NaCl solution. Also, they are not recommendable to be used in an environment where chloride attack is possible and important.

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Section: Open-circuit Potential Monitoringsupporting

confidence: 90%

Section: Introductionsupporting

confidence: 72%

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Susceptibility to corrosion damage of pipeline steels under coating disbondments

Guermazi¹,

Ibrahmi²,

Hmidi³

et al. 2010

Materials & Corrosion

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show abstract

“…The stabilised OCP of the C15 immersed a few minutes in seawater is -0.630 V/ECS, it is comparable to the value given by Dajoux et al [63]: about-0.7 V/ECS for low alloy steel immersed in natural seawater. When C15 steel bars are embedded in sound cement based materials, the chemical composition and the pH of the surrounding medium (interstitial solution, pH about 13.5 [7,64]) lead to the formation of a passive layer composed of iron and calcium hydroxide -Fe(OH) 2 and Ca(OH) 2 - [10] that influence their OCP.…”

Section: Electrochemical Testssupporting

confidence: 84%

Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete

Roux¹,

Bur²,

Ferrari³

et al. 2010

Materials & Corrosion

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International audienceAmong the multitude of concrete structure pathologies, corrosion of rebars is one of the most important problems of concrete durability. In the context of sustainable development, it appears of primary importance to develop new means to protect the rebars against corrosion. This study aims to develop a new eco-friendly and corrosion-inhibiting admixture based on EPS 180 exopolysaccharides, biopolymers used in coatings already studied for the corrosion inhibition on steel in seawater. C15 rebars embedded in CEMI and CEMV cement paste containing EPS 180 were immersed in natural seawater and their electrochemical behaviour was studied using open circuit potential measurements and electrochemical impedance spectroscopy. These tests highlight the decrease of the cathodic reaction kinetics due to the EPS 180 action at the rebars surface, and the absence of effect on the passive layer. Capillary imbibition tests carried out on cement paste and mortars showed that although limiting the imbibition kinetics for cement pastes, the EPS 180 did not influence the water imbibition of mortars. Tests comparing capillary imbibition of soaked cement pastes and mortars with EPS 180 solution and the same samples containing the EPS 180 admixture highlight that the corrosion inhibition induced by EPS 180 admixture is more due to the modification of the cement - rebars interface than to the clogging of the cement porous network

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Influence des éléments d’alliage sur la corrosion d’aciers faiblement alliés en eau de mer naturelle

Cited by 2 publications

References 6 publications

Susceptibility to corrosion damage of pipeline steels under coating disbondments

Susceptibility to corrosion damage of pipeline steels under coating disbondments

Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete

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