Some aspects of the electrochemical behaviour of mild steel in carbonate/bicarbonate solutions

Rangel, C. M.; Fonseca, I.; Leitão, R.A.

doi:10.1016/0013-4686(86)87089-x

Cited by 30 publications

(11 citation statements)

References 7 publications

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“…several µm/year) and in good agreement with short term corrosion experiments made in laboratory to simulate the corrosion mechanisms (Schlegel et al 2008(Schlegel et al , 2014. Besides, electrochemical measurements made by impedance spectroscopy during short term laboratory experiments suggested that the mere presence of the carbonate thick layer was not sufficient to explain the low corrosion rates (because of their relatively high porosity), but that a dense and barrier layer should be present at the interface between the metal and the carbonated corrosion products (Rangel et al 1986;Castro et al 1991;Bataillon et al 2001;Han et al 2009). To verify this assertion the metal/corrosion product interface of some archaeological artefacts was studied at the nanometric scale by a combination of TEM and Scanning Transmission X ray Microscope (STXM) observations performed on a thin film sample obtained by Focused Ion Beam (FIB) at the metal/corrosion product interface.…”

Section: Ferrous Alloyssupporting

confidence: 71%

Nanoscale Aspects of Corrosion on Cultural Heritage Metals

Dillmann

2016

Nanoscience and Cultural Heritage

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International audienceMetallic artefacts are an important part of the cultural heritage and must be protected for the future generations. Unfortunately, classical metal protection methods used for example in industry, can in most of cases not be used in the context of the conservation of cultural heritage because artefacts must not be aesthetically modified and any protection treatment must be potentially removable without any damage to the artefact. For that reason, to set up efficient conservation strategies, it is necessary to understand and model the long term corrosion mechanisms. In addition to environmental monitoring and empirical approaches, the fine understanding of the corrosion systems, based on the use of multiscale character-isation techniques and methodologies is a key issue to understand the mechanisms and evaluate the degradation rates. This chapter reviews the cases for which investigations at nano scales are necessary to understand and model in a reliable way the corrosion behaviour of different metals (ferrous alloys and bronzes). Nanoscale investigation, also allows scientists to understand the way intentional patinas were made on ancient bronzes. Lastly, an example of the use of nan-otechnology to set up an adapted and innovative protective treatment is given

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Section: Ferrous Alloyssupporting

confidence: 71%

Nanoscale Aspects of Corrosion on Cultural Heritage Metals

Dillmann

2016

Nanoscience and Cultural Heritage

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“…Many investigations were carried out using highly alkaline solutions [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] or using buffer solutions as carbonate/bicarbonate [19][20][21][22][23][24][25][26] or borate buffer [27][28][29][30][31][32] when a constant and not very high pH is desirable. Many products have been identified as resulting from the anodic polarization of iron at different potentials, by different surface analysis techniques [6][7][8][9][10][11][12][13]22,26,[33][34][35][36][37][38][39][40]…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behaviour of Iron in NaOH 0.01 mol/L Solutions Containing Variable Amounts of Silicate

Amaral¹,

Müller²

1999

J. Braz. Chem. Soc.

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Ciclos voltamétricos repetitivos do ferro em soluções de NaOH contendo concentrações variáveis de silicato entre 10 ppm e 1500 ppm, mostram comportamentos diferentes da primeira varredura quando comparada com as subsequentes, em todas as soluções testadas. Esta diferença indica uma modificação do processo de formação do filme com a ciclagem. Foi observada uma transição do perfil i/E entre 10 ppm e 100 ppm de silicato o que permite formular considerações sobre a incorporação de silicato ao filme.Repetitive voltammetric cycling of iron in NaOH solutions containing variable silicate concentrations between 10 ppm and 1500 ppm, shows different behaviour for the first scan when compared to the following ones in all studied solutions. This difference indicates a modification on the film formation process. A transition in the i/E profile between 10 ppm and 100 ppm of silicate was observed allowing considerations about silicate incorporation to be formulated.

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“…However, as under anodic polarization kinetics should also be considered, peak A could be related with the oxidation of the Fe(II) into Fe(III) species and peak A′ (−0.87 V vs . SHE) probably due to the reduction of Fe (III) oxide/hydroxide to Fe (II) .…”

Section: Resultsmentioning

confidence: 99%

The efficiency of electrochemical methods for the removal of chloride ions from iron marine archaeological objects: A comparative study

Coelho

Oliveira

Carvalho

et al. 2012

Materials & Corrosion

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The conservation of archaeological marine iron artefacts requires chloride ions removal. In this study, the removal of chloride ions was undertaken by two electrochemical methods: the electrolytic and the galvanic reduction in alkaline media. The results were compared with those obtained by the washing and the sulphite reduction methods, under identical conditions. The experiments were performed on samples coming from an 18th century cast iron cannon‐ball, found in the archaeological context of a shipwreck, l'Océan, which sank near the southern Portuguese coast, in 1759. The extraction of chloride ions was monitored by ionic chromatography (IC). The results allow to conclude that the sulphite reduction experiments using the mixture 0.5 M NaOH/0.5 M Na2SO3 presents the higher efficiency in the first week, being further overcome by both electrochemical methods. After 40 days of treatment, the electrolytic reduction is the most efficient method.

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Some aspects of the electrochemical behaviour of mild steel in carbonate/bicarbonate solutions

Cited by 30 publications

References 7 publications

Nanoscale Aspects of Corrosion on Cultural Heritage Metals

Nanoscale Aspects of Corrosion on Cultural Heritage Metals

Electrochemical Behaviour of Iron in NaOH 0.01 mol/L Solutions Containing Variable Amounts of Silicate

The efficiency of electrochemical methods for the removal of chloride ions from iron marine archaeological objects: A comparative study

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