Galvanic corrosion between zinc and carbon steel investigated by local electrochemical impedance spectroscopy

Mouanga, M.; Puiggali, M.; Tribollet, Bernard; Vivier, Vincent; Pébère, Nadine; Devos, O.

doi:10.1016/j.electacta.2012.10.002

Cited by 66 publications

(29 citation statements)

References 36 publications

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“…The local impedance spectra measured over each of the three electrodes show in some cases an inductive loop at the high frequencies, Figure 5. This loop was observed clearly on the zinc electrode and also on the remote cathode, but not in the inner iron electrode, possibly because of a smaller geometrical distortion of the ionic flow [29]. The high and medium frequency portion of the spectrum is resistive, whereas at frequencies below ~100 Hz a constant-phase-element slope is observed, which corresponds to 10 -4 Fcm -2 s n-1 (with n=0.85) for both Fe1 and Fe2 and 10 -3 Fcm -2 s n-1 (with n=0.89) on zinc.…”

Section: Local Electrochemical Impedance Spectroscopy Leismentioning

confidence: 92%

Application of scanning electrode techniques for the evaluation of iron–zinc corrosion in nearly neutral chloride solutions

et al. 2016

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A model electrode consisting of a narrow zinc anode and a split iron cathode was used for assessing galvanic corrosion at cut edges. This setup aimed at a better understanding of the mechanisms of galvanic corrosion at cut edges and of the effective resolution of microprobe electrochemical techniques, namely the scanning electrochemical microscope (SECM), the localized electrochemical impedance spectroscopy (LEIS) and the scanning vibrating electrode technique coupled with the scanning ion-selective electrode technique (SVET/SIET).Hydroxyl ions diffuse across the cathode, in the direction of the anode, until they reach the critical area of precipitation above the cathode, at a distance from the edge of the cathode. The zinc corrosion products ultimately precipitate on the iron cathode, once the critical pH and solubility limits for precipitation of zinc corrosion is reached, at a distance from the edge that is determined by the diffusion of Zn 2+ and counter-diffusion of OH -. These precipitates revealed no inhibition on the cathodic reaction.The local activity on the zinc was easily detected by the LEIS and the SVET, whereas the zinc corrosion products were detected by the SECM. The local a.c. admittance measured on the cathode closer to the zinc anode at the early stages was insensitive to the local activity despite the d.c. ionic current measured in solution, whereas for longer immersion times an increase of admittance is explained by an increase in the solution conductivity.

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Section: Local Electrochemical Impedance Spectroscopy Leismentioning

confidence: 92%

Application of scanning electrode techniques for the evaluation of iron–zinc corrosion in nearly neutral chloride solutions

et al. 2016

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“…Yin et al 5 studied galvanic corrosion behaviour of SM80SS and Ni-based alloy G3 at 30, 60 and 90 C under various ratios of area sizes conditions; they found that the galvanic current is proportional to the temperature and anode area ratio, and with increased anode area ratio, pits gradually deepen. Mouanga et al 6 studied galvanic corrosion behaviour by in situ electrochemical impedance spectroscopy for zinc and carbon steel, Lacroix et al 7 performed a research on galvanic corrosion behaviour between aluminum and magnesium, as well as Jorcin et al 8 studied the galvanic corrosion between copper and aluminium; the potential and current distributions on the surface of the model couple were obtained using Laplace equation through a finite element method algorithm; a good agreement was found between experimental and theoretical results. Various factors, which include anode area ratio, temperature, delivery of dissolved oxygen, as well as different kinds of surface passive film and material potential difference between dissimilar materials, affect galvanic corrosion.…”

Section: Introductionmentioning

confidence: 68%

Galvanic corrosion behavior between Ti6Al4V and CoCrMo alloys in saline solution

Geng¹,

Zhang²,

Chen³

et al. 2014

Mat Express

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The galvanic corrosion behaviours of two commonly used metallic materials used in artificial joints in saline solution are investigated. Electrochemical testing techniques such as open-circuit potential (OCP), galvanic current (I g ), dynamic polarisation curves and electrochemical impendence spectroscopy are used to evaluate the corrosion properties of the alloys under various immersion times. The following results are obtained: the galvanic current increases with increased immersion time; compared with static corrosion, the corrosion potential (E corr ) and corrosion current density (I corr ) of coupled Ti6Al4V alloys display inconspicuous changes, whereas the corrosion potential of CoCrMo alloys significantly decreases; corrosion current density and corrosion rate (CR) increase by at least two orders of magnitude; corrosion current density increases from 5.8397 × 10 −9 Amp/cm 2 to 5.1889 × 10 −7 Amp/cm 2 ; the corrosion rate increases from 6.8687 × 10 −5 mm/a to 6.1033 × 10 −3 mm/a; the electrochemical impendence of coupled CoCrMo alloy shows significant change because of anodic dissolution where the passive film does not easily form and stabilize. Although the galvanic current of the coupled alloys is found at a lower order of magnitude (3.8 × 10 −8 A to 7 × 10 −8 A) during the test period, the galvanic corrosion between Ti6Al4V and CoCrMo alloys significantly affects the electrochemical impendence of CoCrMo alloys.

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“…[64][65][66] A possible cause could be the adsorption or desorption of activating or blocking species with increasing overpotential of each process. Two situations can be considered: (i) If the anodic adsorption (therefore cathodic desorption) of a blocking species occurs the inductive loop appears due to the dominant effect in the cathodic process; or (ii) if the anodic desorption (therefore cathodic adsorption) of a blocking species for the reactions (OIH layer) occurs then the observed inductive loop results as the dominant effect in the anodic component.…”

Section: Resultsmentioning

confidence: 99%

Ureasilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Chloride-Contaminated Simulated Concrete Pore Solution

Figueira

Silva

Pereira

2015

J. Electrochem. Soc.

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Organic-inorganic hybrid (OIH) sol-gel coatings based on ureasilicates (U(X)) have promising properties for use as eco-friendly coatings on hot dip galvanized steel (HDGS) and may be considered potential substitutes for pre-treatment systems containing Cr(VI). These OIH coatings reduce corrosion activity during the initial stages of contact of the HDGS samples with highly alkaline environments (cementitious media) and allow the mitigation of harmful effects of an initial excessive reaction between cement pastes and the zinc layer. However, the behavior of HDGS coated with U(X) in the presence of chloride ions has never been reported. In this paper, the performance of HDGS coated with five different U(X) coatings was assessed by electrochemical measurements in chloride-contaminated simulated concrete pore solution (SCPS). U(X) sol-gel coatings were produced and deposited on HDGS by a dip coating method. The coatings performance was evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization curves measurements, macrocell current density and polarization resistance in contact with chloride-contaminated SCPS. The SEM/EDS analyses of the coatings before and after the tests were also performed. The results showed that the HDGS samples coated with the OIH coatings exhibited enhanced corrosion resistance to chloride ions when compared to uncoated galvanized steel. Corrosion of the reinforcing steel is one of the most important causes of degradation in reinforced concrete structures (RCS).1 The presence of chloride, carbonation of the concrete or the low quality of the concrete cover causes serious damage to RCS. The entrance of chloride ions through the concrete from marine environments or deicing salts can cause rupture of the passive layer, allowing the steel surface to act as a coupled anodic and cathodic reaction cell in which corrosion processes take place.1-3 Therefore, the presence of chlorides in concrete can seriously shorten the service life of RCS. 3,4The expanded volume of corrosion products deposited in the interface between the concrete and the steel imposes expansive stresses, leading to delamination, cracking or spalling and eventually to the collapse of the RCS. 1 Several methods to improve the corrosion resistance of RCS have been proposed. 1,[5][6][7] In the last few years, the use of hot-dip galvanized steel (HDGS) has been recognized as an effective measure to increase the service life of RCS. [8][9][10][11] The galvanized coating (zinc layer) acts as a physical barrier, hindering the contact of aggressive agents with the steel substrate and the zinc acts as a sacrificial anode protecting the steel against corrosion. In addition, the formed zinc corrosion products have a smaller volume than those produced from iron, thus reducing the corrosion-induced delamination, cracking or spalling of the concrete.8 Additionally, the galvanized steel reinforcement can withstand exposure to chloride ion concentrations several times higher than the chloride level that causes corrosion in ste...

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Galvanic corrosion between zinc and carbon steel investigated by local electrochemical impedance spectroscopy

Cited by 66 publications

References 36 publications

Application of scanning electrode techniques for the evaluation of iron–zinc corrosion in nearly neutral chloride solutions

Application of scanning electrode techniques for the evaluation of iron–zinc corrosion in nearly neutral chloride solutions

Galvanic corrosion behavior between Ti6Al4V and CoCrMo alloys in saline solution

Ureasilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Chloride-Contaminated Simulated Concrete Pore Solution

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