Open circuit potential transients and electrochemical quartz crystal microgravimetry measurements of dissolution of copper in acidic sulfate solutions

Zelinsky, A.G.; Pirogov, B.Ya.; Yurjev, O.A.

doi:10.1016/j.corsci.2003.09.008

Cited by 28 publications

(24 citation statements)

References 12 publications

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“…The corrosion behavior of the coatings with and without sealing treatment was evaluated by electrochemical measurements including open circuit potential (OCP), potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS), with which the kinetics and mechanism of the electrode processes, the changes in corrosion current and corrosion potential, as well as the film formation and destruction can be revealed, respectively [25][26][27]. Electrochemical tests were conducted by Parstat 2273 advanced electrochemical system in a three-electrode cell, where coating specimen, platinum wire and saturated calomel electrode were used as working electrode, counter electrode and reference electrode, respectively.…”

Section: Methodsmentioning

confidence: 99%

Influence of Ultrasonic Excitation Sealing on the Corrosion Resistance of HVOF-Sprayed Nanostructured WC-CoCr Coatings under Different Corrosive Environments

et al. 2019

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The corrosion behavior of unsealed and sealed high-velocity oxygen-fuel (HVOF)-sprayed nanostructured WC-CoCr cermet coatings under different corrosive environments was investigated using scanning electron microscopy (SEM), open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Ultrasonic excitation sealing with aluminum phosphate was performed in an external ultrasonic bath with the frequency of 40 kHz at atmospheric pressure and room temperature. SEM micrographs revealed that the exposed area of the coating was effectively reduced by the coverage of aluminum phosphate sealant on the majority of pores. Electrochemical measurements demonstrated that the sealant with the help of ultrasonic energy could shift the corrosion potential to a more noble direction, reduce the corrosion current density, increase the resistance of charge transfer, and effectively improve the corrosion resistance of the coating in both 3.5 wt % NaCl and 1 mol·L−1 HCl solutions.

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Section: Methodsmentioning

confidence: 99%

Influence of Ultrasonic Excitation Sealing on the Corrosion Resistance of HVOF-Sprayed Nanostructured WC-CoCr Coatings under Different Corrosive Environments

et al. 2019

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“…The share of the reaction of reduction of dissolved oxygen, which occurs simultaneously with reaction (4), may be estimated on the basis of data reported in [6]. According to the authors of [6], the rate of corrosion of thin freshly deposited copper deposits in stagnant sulfate solutions containing oxygen, which was measured using the same method (v cor ≈ 10 ng s -1 cm -2 ), is independent of the solution composition and is restricted by the mass transfer of dissolved oxygen.…”

Section: The Time Dependences Of E and M In Solutions With Varying Comentioning

confidence: 99%

“…According to the authors of [6], the rate of corrosion of thin freshly deposited copper deposits in stagnant sulfate solutions containing oxygen, which was measured using the same method (v cor ≈ 10 ng s -1 cm -2 ), is independent of the solution composition and is restricted by the mass transfer of dissolved oxygen. Thus, the oxygen reduction plays an insignificant role in the overall current of the cathodic reaction even in the case of the lowest copper concentration studied.…”

Section: The Time Dependences Of E and M In Solutions With Varying Comentioning

confidence: 99%

Copper Corrosion in Acid Chloride Solutions: A Quartz Microgravimetry Study

2005

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Making use of the quartz microgravimetry method allows one to in situ obtain the m vs. t curves simultaneously with the E cor vs. t curves ( m is the weight of a dissolved or deposited substance, t a time period, E cor a corrosion potential), which gives one a chance to determine the corrosion rate and its dependence on the concentration of copper ions and chloride ions in solution to within a good accuracy. The corrosion rate increases with increasing concentration of ions of divalent copper in solution, while an increase in the concentration of chloride ions does not lead to its change. The formation of a salt film of an intermediate compound of univalent copper during the copper dissolution process in solutions diluted with respect to chloride ions (0.1 M NaCl, 0.03 M CuCl 2 ) is discovered experimentally. In the m vs. t curves, the formation of the film manifests itself in the form of an increase in the electrode weight, while the corrosion potential transients reflect but weakly the occurring complex surface conversions. Techniques for the identification of intermediate solid species are proposed. The coefficients of mass transfer with respect to ions of divalent copper are determined. Explanations for variations in the system's behavior following a decrease in the concentration of chloride ions in solution are offered.

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“…10, where the diffusion of oxygen is considered. In fact, the cathodic reaction of oxygen reduction is generally proposed for the mechanism of copper corrosion [33,34] and the diffusion control of oxygen has been previously reported [7,35].…”

Section: Electrochemical Response Of Patina In Sulphate Solutionmentioning

confidence: 99%

Local electrochemical investigation of copper patina

Mennucci

Moreno

Aoki

et al. 2011

J Solid State Electrochem

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The patination of copper is known for its complexity and heterogeneous formation. For a deeper investigation, a locally resolved surface analysis was considered. An exact determination of the accessed area and a potentiostatic control in a three-electrode configuration was reached with the use of the electrochemical microcell technique, which enables local electrochemical measurement such as local electrochemical impedance spectroscopy and cyclic voltammetry. Such a technique provides a unique way for performing the investigation of heterogeneities on electrode surfaces. The local electrochemical measurements on the artificially patinated surface have allowed distinguishing areas of different reactivity even when the analysis of the surface revealed a homogenous chemical composition of patina. Local measurements with the electrochemical microcell showed the presence of small defects on the patina layer that can be modelled by considering a hemispherical diffusion process at small active areas surrounded by larger less reactive domains.

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Open circuit potential transients and electrochemical quartz crystal microgravimetry measurements of dissolution of copper in acidic sulfate solutions

Cited by 28 publications

References 12 publications

Influence of Ultrasonic Excitation Sealing on the Corrosion Resistance of HVOF-Sprayed Nanostructured WC-CoCr Coatings under Different Corrosive Environments

Influence of Ultrasonic Excitation Sealing on the Corrosion Resistance of HVOF-Sprayed Nanostructured WC-CoCr Coatings under Different Corrosive Environments

Copper Corrosion in Acid Chloride Solutions: A Quartz Microgravimetry Study

Local electrochemical investigation of copper patina

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