Corrosion and protection of high leaded tin bronze covered with patina in NaHCO3 + Na2SO4 solution simulating acid rain in urban environment - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Bulgarian Chemical Communications Année : 2005

Corrosion and protection of high leaded tin bronze covered with patina in NaHCO3 + Na2SO4 solution simulating acid rain in urban environment

Résumé

An experimental procedure for obtaining reproducible patina on high leaded tin bronze, B66 (Cu-8Sn-14Pb in wt %) has been devised, followed by its isolation from the substrate and examination of the electrochemical behaviour in a solution of 0.2 g.L - 1 Na 2 SO 4 + 0.2 g.L - 1 NaHCO 3 acidified to pH 3. This test medium simulates a strongly acidic rain in urban environment. The patina scraped off from the bronze substrate was filled into a cavity microelectrode. The cyclic voltammetry in the test solution showed one large cathodic peak and a sharp anodic one. The addition of bitriazole (BiTA) in this test solution showed a distinct decrease of the anodic peak current. This compound therefore stabilizes the patina covering the bronze artefact. The impedance spectra, obtained with a cavity microelectrode, were interpreted by an equivalent circuit comprising the charge transfer resistance, the double layer capacitance, the resistance and capacitance representing the reversible process taking place on the electrode surface, and the spherical diffusion of the dissolved oxygen. The charge transfer resistance evaluated from a non-linear regression calculation, corroborated the inhibiting effect of BiTA suggested from cyclic voltammograms.

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Chimie
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Dates et versions

hal-04189329 , version 1 (28-08-2023)

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  • HAL Id : hal-04189329 , version 1

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Kamal Rahmouni, Suzanne Joiret, Luc Robbiola, A. Srhiri, Hisasi Takenouti, et al.. Corrosion and protection of high leaded tin bronze covered with patina in NaHCO3 + Na2SO4 solution simulating acid rain in urban environment. Bulgarian Chemical Communications, 2005, 37 (1), pp.26-34. ⟨hal-04189329⟩
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