Protection of bronze covered with patina by innoxious organic substances

Mureşan, Liana Maria; Varvara, Simona; Stupnišek‐Lisac, Ema; Otmačić, Helena; Marušić, Katarina; Horvat-Kurbegović, Šefka; Robbiola, Luc; Rahmouni, K.; Takenouti, H.

doi:10.1016/j.electacta.2007.02.024

Cited by 92 publications

(64 citation statements)

References 14 publications

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“…Nous avons montré récemment que les autres molécules comme le thiadiazole ou imidazole, dont l'innocuité est vérifiée, protègent également efficacement le bronze patiné [19].…”

Section: Protection Des Pièces De Monnaie En Bronzeunclassified

Spectroscopie d'impédance électrochimique appliquée à l'étude de la corrosion

2007

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Résumé -Nous allons présenter différentes applications de la spectroscopie d'impédance électrochimique réalisées depuis 40 ans. Au début de cette longue histoire, l'emploi de signaux alternatifs était destiné à remplacer la méthode stationnaire dite de Stern et Geary, c'est-à-dire la mesure de la résistance de polarisation. Cependant, rapidement nous avons constaté que le spectre d'impédance contenait plusieurs informations sur les phénomènes se déroulant à l'interface métal | électrolyte. Ils se manifestent par une constante de temps propre à chaque processus, donc généralement distinguables par une analyse en fréquence. Après avoir présenté la différence majeure entre la méthode stationnaire et la méthode d'impédance dans l'étude de la corrosion à la fois en termes de compréhension des méca-nismes et de prévision de sa vitesse, nous aborderons plusieurs applications de cette dernière méthode : la résistance d'électrolyte, l'effet protecteur d'inhibiteurs organiques et la protection de bronzes archéologiques recouverts de patine. Key words:Faradic impedance; inhibitor; relaxation; bronze; cultural heritage Abstract -Electrochemical Impedance spectroscopy applied to the corrosion study. Various applications of the Electrochemical Impedance Spectroscopy over the last 40 years are described. At the beginning of this long history, ac signal has been used simply to determine steady state entity, the polarisation resistance to apply Stern-Geary method. However, it was remarked immediately that the impedance spectrum contains many useful information on the processes taking place at the corroding interface. These processes are revealed by a specific time-constant for each phenomenon, therefore they can be distinguished by analysing the impedance spectrum in the frequency domain. After describing the main difference between the steady-state and impedance methods for the corrosion investigation for the understanding of corrosion mechanism as well as the estimation of corrosion rate, we will show several aspects of the latter method: Electrolyte resistance, protective effect of corrosion inhibitor and the protection of bronze archaeological artefacts covered with patina.

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“…Nous avons montré récemment que les autres molécules comme le thiadiazole ou imidazole, dont l'innocuité est vérifiée, protègent également efficacement le bronze patiné [19].…”

Section: Protection Des Pièces De Monnaie En Bronzeunclassified

Spectroscopie d'impédance électrochimique appliquée à l'étude de la corrosion

2007

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“…[2] It is well known that copper is a relatively noble metal and its surface is covered by a film that prevents or slows down corrosion processes. [3] However, this passive film can be broken down when aggressive ions such as chloride and sulfide are present in the atmosphere, and copper tarnishing will happen. [4 -6] Such tarnishing can be aesthetically unpleasant as well as cause a failure of an effective electrical connection.…”

Section: Introductionmentioning

confidence: 99%

Investigation of molybdate–benzotriazole surface treatment against copper tarnishing

Zhang

Joo

Lee

2008

Surface & Interface Analysis

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The synergistic effect of benzotriazole (BTAH) and molybdate on the inhibition of copper tarnish was studied in this paper. The antitarnish treatment of copper was conducted with BTAH solution containing molybdate. The surface morphology observation and composition analysis were investigated by SEM with energy dispersive X-ray (EDX) spectroscopy. The addition of molybdate improved the protection of BTAH significantly. The BTAH + molybdate treated copper specimen has higher N concentration in its surface. The structure of the protective film was studied by XPS and AES measurements. It was characterized to be a complex of Cu(I)BTA. The antitarnish effect is certified by the formation of the protective Cu(I)BTA film. Molybdate does not participate in the formation of the protective film. The presence of molybdate promotes the passivation of copper. This facilitates the stabilization of the cuprous oxide film, and strengthens the adsorption of BTAH.

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“…The calculation was carried out between about 20mV to anodic and 50mV to cathodic from the corrosion potential [41]. Too wide potential range may induce a systematic error, because the system will no longer follow the Tafel law.…”

Section: Polarization Curvesmentioning

confidence: 99%

Protection of reinforcement steel corrosion by phenyl phosphonic acid pre-treatment PART I: Tests in solutions simulating the electrolyte in the pores of fresh concrete

Etteyeb

Dhouibi

Takenouti

et al. 2015

Cement and Concrete Composites

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The carbon steel electrodes were first treated by immersion in 0.1 M phenyl phosphonic acid (C 6 H 5 P(O)(OH) 2, PPA) solution during 24 or 72 hours, then they were transferred into the corrosion test solution representing interstice pore electrolyte polluted by seawater:sat. Ca(OH) 2 + 0.5M NaCl) to evaluate the protective effectiveness of the pre-treatment. The investigation was performed essentially by polarization curves and electrochemical impedance measurements with rotating disc electrode. Very high protective effect was observed with steel pre-treated during 72 hours with stationary electrode. From polarization and electrochemical impedance spectroscopy experiments, the protective efficiency was found to be in the 90-99% range for 72 hour pre-treatment. This protective property remains effective even one month immersion. EDS analysis showed the presence of the phosphorus on the steel surface, probably due to the presence of iron-PPA complex.

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Protection of bronze covered with patina by innoxious organic substances

Cited by 92 publications

References 14 publications

Spectroscopie d'impédance électrochimique appliquée à l'étude de la corrosion

Spectroscopie d'impédance électrochimique appliquée à l'étude de la corrosion

Investigation of molybdate–benzotriazole surface treatment against copper tarnishing

Protection of reinforcement steel corrosion by phenyl phosphonic acid pre-treatment PART I: Tests in solutions simulating the electrolyte in the pores of fresh concrete

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