Chemical characterization and anticorrosion properties of corrosion products formed on pure copper in synthetic rainwater of Rio de Janeiro and São Paulo

Hernández, R.; Pászti, Zoltán; Melo, Hercílio Gomes de; Aoki, Idalina Vieira

doi:10.1016/j.corsci.2009.11.003

Cited by 31 publications

(18 citation statements)

References 26 publications

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“…1a) show the occurrence of two time constants. The high frequency time constant develops as a result of the capacitive response of the oxide film on the surface of the 316L specimen 27 and is characterized by a shoulder at approximately 100 Hz. It is seen that this time constant did not suffer significant changes with the elapsed time.…”

Section: Resultssupporting

confidence: 65%

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Antunes

Oliveira

Costa

2011

Materials & Corrosion

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In this work the corrosion resistance of AISI 316L biomedical stainless steel was assessed through electrochemical impedance spectroscopy (EIS) measurements in Hanks' solution at 37 °C. Specimens were immersed in the electrolyte during 21 days. Semi‐conducting properties of the passive film naturally formed on the surface of the metallic material during the test were evaluated through the Mott–Schottky approach. The aim was to investigate the correlation between corrosion resistance and semi‐conducting properties in the physiological solution. The corrosion resistance was found to decrease with the immersion time. The density of defects in the passive film increased accordingly as indicated by the Mott–Schottky plots. The passive film presented a semi‐conducting behavior with a duplex character. Above the flat band potential the behavior was typical of an n‐type semiconductor whilst below such value it was typical of a p‐type semiconductor. The results from EIS measurements and Mott–Schottky were in good agreement, suggesting that the corrosion resistance of biomedical stainless steels may be associated with the semi‐conducting properties of the passive films formed during immersion in physiological medium.

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Section: Resultssupporting

confidence: 65%

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Antunes

Oliveira

Costa

2011

Materials & Corrosion

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“…10(c), in the LF region, a clear Warburg response develops indicating that the LF process must be different from that verified in the samples tested in the NaCl 0.1 mol dm −3 solution. We propose that, as verified by Feng et al [36] for copper corrosion in solutions with similar pH, the diffusion of copper ions through the oxide layer would be the rate limiting step, since cuprite must be the main component of the corrosion product layer formed in this solution [35]. The cuprite precipitated in the pore walls would be responsible for the depressed HF capacitive loop.…”

Section: Discussionmentioning

confidence: 52%

“…6(b) show a HF shoulder for the non-patinated copper sample, which is absent from the diagram of the S1 coated sample. In a recent work Hernández et al [35] verified that immersion of copper samples in synthetic rainwater of São Paulo for up to three days led to an improvement of the corrosion resistance of the metal. This effect was ascribed to the thickening and healing of the oxide layer (cuprite) associated with the presence of NH 4 + ions.…”

Section: Discussionmentioning

confidence: 97%

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Electrochemical impedance spectroscopy investigation of the electrochemical behaviour of copper coated with artificial patina layers and submitted to wet and dry cycles

Hernández

Aoki

Tribollet

et al. 2011

Electrochimica Acta

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To cite this version:R. del P.B. Hernandez, I.V. Aoki, Bernard Tribollet, Hercilio G. de Melo. Electrochemical impedance spectroscopy investigation of the electrochemical behaviour of copper coated with artificial patina layers and submitted to wet and dry cycles. Electrochimica Acta, Elsevier, 2011, 56 (7), pp.a b s t r a c t Due to rain events historical monuments exposed to the atmosphere are frequently submitted to wet and dry cycles. During drying periods wetness is maintained in some confined regions and the corrosion product layer, generally denominated patinas, builds up and gets thicker. The aim of this study is to use electrochemical impedance spectroscopy (EIS) to investigate the electrochemical behaviour of pure copper coated with two artificial patina layers and submitted either to continuous or to intermittent immersion tests, this latter aiming to simulate wet and dry cycles. The experiments were performed in 0.1 mol dm −3 NaCl solution and in artificial rainwater containing the most significant pollutants of the city of São Paulo. The results of the continuous immersion tests in the NaCl solution have shown that the coated samples behave like a porous electrode with finite pore length. On the other hand, in the intermittent tests a porous electrode response with semi-infinite pore length can be developed. The results were interpreted based on the model of de Levie and a critical comparison with previous interpretations reported in the literature for similar systems is presented.

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“…However, their attentions are more focused on the corrosion behavior of magnesium and its alloys under TEL conditions containing NaCl and/or Na 2 SO 4 solution with a high concentration. It is to be noticed that NH 4 + is an important component of the particulate matter in the atmosphere . The role of NH 4 + ion in the atmospheric corrosion evolution of magnesium alloys also should be explored.…”

Section: Introductionmentioning

confidence: 99%

Influences of NH₄⁺ ions and thin electrolyte layers (TEL) thickness on the corrosion behavior of AZ91D magnesium alloy

Liu

et al. 2019

Materials & Corrosion

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In this study, the influences of NH4 + ions and the thin electrolyte layer (TEL) thickness on the corrosion behavior of the AZ9D magnesium alloy in NH4+‐containing environments were investigated by electrochemical measurements and surface characterization. The experimental results indicate that NH4+ greatly accelerates the corrosion of AZ91D magnesium alloy whether in a bulk solution or in a TEL. As the TEL thickness decreasing, the corrosion resistance of the AZ91D magnesium alloy is strengthened. According to the corrosion morphology, electrochemical analysis, and characterization analysis of corrosion products, the corrosion mechanism of AZ91D under TELs with different thicknesses is divided into three stages: (a) uniformly distributed corrosion pits with deep depth and large size when TEL thickness is higher than or equal to 500 μm; (b) slightly corrosion with randomly distributed corrosion pits and the accumulation of small amount of corrosion product when TEL thickness is between 100 μm and 200 μm; (c) no corrosion pit with only deposition of corrosion product when TEL thickness is lower than or equal to 100 μm. Among which, the roles of NH4+, TEL thickness, and corrosion product are emphasized and discussed in the corrosion process of AZ91D magnesium alloy under TEL with different thicknesses.

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Chemical characterization and anticorrosion properties of corrosion products formed on pure copper in synthetic rainwater of Rio de Janeiro and São Paulo

Cited by 31 publications

References 26 publications

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Electrochemical impedance spectroscopy investigation of the electrochemical behaviour of copper coated with artificial patina layers and submitted to wet and dry cycles

Influences of NH₄⁺ ions and thin electrolyte layers (TEL) thickness on the corrosion behavior of AZ91D magnesium alloy

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Chemical characterization and anticorrosion properties of corrosion products formed on pure copper in synthetic rainwater of Rio de Janeiro and São Paulo

Cited by 31 publications

References 26 publications

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Electrochemical impedance spectroscopy investigation of the electrochemical behaviour of copper coated with artificial patina layers and submitted to wet and dry cycles

Influences of NH4+ ions and thin electrolyte layers (TEL) thickness on the corrosion behavior of AZ91D magnesium alloy

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Influences of NH₄⁺ ions and thin electrolyte layers (TEL) thickness on the corrosion behavior of AZ91D magnesium alloy