Electrochemical Impedance Spectroscopy Study of the Corrosion Process on Coated Galvanized Steel in a Salt Spray Fog Chamber

Pérez, C.; Collazo, A.; Izquierdo, M.; Merino, Pablo; Nóvoa, X.R.

doi:10.5006/1.3280510

Cited by 30 publications

(10 citation statements)

References 22 publications

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“…Similar to metal oxides, Zn 5 (OH) 8 Cl 2 ·H 2 O (simonkolleite) is also electrochemically active as an electrode material for supercapacitors [26]. Most reports on simonkolleite deal with its bulk properties, with a net focus on understanding the surface atmospheric corrosion products on Zn plates [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Khamlich

Bello

Fabiane

et al. 2013

J Solid State Electrochem

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Nickel foam-graphene (NF-G) was synthesised by chemical vapour deposition (CVD) followed by facial in situ aqueous chemical growth of simonkolleite (Zn 5 (OH) 8 Cl 2 ·H 2 O) under hydrothermal conditions to form NF-G/simonkolleite composite. X-ray diffraction and Raman spectroscopy show the presence of simonkolleite on the NF-G, while scanning electron and transmission electron microscopies show simonkolleite micro-plates like structure evenly distributed on the NF-G. Electrochemical measurements of the composite electrode give a specific capacitance of 350 Fg -1 at current density of 0.7 Ag -1 for our device measured in three-electrode configuration. The composite also shows a rate capability of 87% capacitance retention at a high current density of 5 Ag -1 , which makes it a promising candidate as an electrode material for supercapacitor applications.

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Section: Introductionmentioning

confidence: 99%

“…Most reports on simonkolleite deal with its bulk properties, with a net focus on understanding the surface atmospheric corrosion products on Zn plates [26,27]. Simonkolleite forms hexagonal microplatelet crystals with a perfect cleavage parallel to the (001) direction [28].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Khamlich

Bello

Fabiane

et al. 2013

J Solid State Electrochem

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“…In the models, R el is for the electrolyte resistance, C p for the capacitance of the chromate layer, R p for the resistance in the pores of the chromate layer, C dl for the double-layer capacitance and R ct for the charge transfer resistance of the electrode reaction effects. C ad and R ad are parameters for adsorption-reaction processes [14] and/or for oxygen diffusion effects [15]. The elements C dl and C ad were substituted by constant phase elements (CPE).…”

Section: Impedance Measurementsmentioning

confidence: 99%

Influence of drying temperature on the corrosion performance of chromate coatings on galvanized steel

Zhang¹,

Böhm

Bosch

et al. 2004

Materials & Corrosion

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The influence of drying temperature on the corrosion performance of chromate coatings on electro-galvanized (EG) steel has been investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic measurements in 3.5% NaCl solutions. The chromate coatings were applied to the EG steel in a solution (pH 1.2) containing sodium dichromate and sulfuric acid at room temperature. The coatings were dried in an oven at three different temperatures: 60, 110 and 210 8C. The surface of the chromate coatings was analyzed using atomic force microscopy (AFM) and scanning electron microscopy (SEM) combined with energy-dispersive spectrometry (EDS). The results show that the drying temperature significantly affects the morphology of the chromate coatings and consequently affects their corrosion behavior. The chromate coatings dried at 110 8C had few cracks and the lowest corrosion current. The chromate coatings dried at 60 8C showed passivity. The EIS results show that the chromate coatings dried at 60 8C has the largest impedance in a neutral 3.5% NaCl solution. Drying at higher temperature (210 8C) degrades the chromate coatings by widening the cracks and reducing soluble Cr(VI) in the chromate layer. The favorable drying temperature for the chromate coatings on the EG steel is between 60 and 110 8C.

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“…Initially, the barrier resistance was related to the physical barrier between the zinc and the electrolyte due to the presence of both the conversion layer and the native oxides that always exist on the very reactive zinc surfaces [98][99][100]. Then, when the electrolyte reached the zinc layer at the bottom of the pre-treatment pores and/or micro-cracks and after a certain activation period [101], those oxides dissolved and the zinc localized corrosion started to develop [102] with a kinetic dependence on the electrolyte aggressiveness. From this situation, the barrier resistance evolution was attributed to different contributions.…”

Section: Time Dependence Of the Resistive Elements Contributing To Thmentioning

confidence: 99%

Characterization and Corrosion Resistance of Galvanized Steel/Passivation Composite/ Polyurethane Paint Systems

Sarli¹,

Elsner²,

Tomachuk³

2014

BJAST

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The corrosion performance of electrogalvanised steel sheets pre-treated with a Cr 3+ or Cr +6 -based conversion layer and then covered with polyurethane-waterborne topcoat paint has been studied. The pre-treated metallic panels were coated with one of the three tested polyurethane (PU) topcoat paints, in which the dispersion type was the formulation variable. The pigment was TiO 2 (rutile) with a PVC value of 10. Before and after the immersion in 0.05 M NaCl (pH 5.70) or 0.1 M Na 2 SO 4 (pH 6.36) solutions, replicates of the different samples were subjected to standardized tests (porosity, gloss and color, hardness, flexibility). During the immersion, blistering and rusting degrees were evaluated through periodical visual inspections, while the coated steel performance was monitored by Electrochemical Impedance Spectroscopy (EIS) measurements. Initial (dry) and final (wet) paint adhesion was also determined. EIS data were interpreted and discussed in terms of the time dependence of the electrical (paint coating) and electrochemical (steel substrate) parameters associated with interfacial processes describing the metal/paint system deterioration. According to the electrochemical properties, visual inspection and Original Research ArticleBritish Journal of Applied Science & Technology, 4(6): 853-878, 2014 854 standardized tests results, it was concluded that the studied polyurethane-based polymeric films applied on pretreated electrogalvanised steel provided a very effective protection against corrosion as a result of their excellent barrier properties.

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Electrochemical Impedance Spectroscopy Study of the Corrosion Process on Coated Galvanized Steel in a Salt Spray Fog Chamber

Cited by 30 publications

References 22 publications

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Influence of drying temperature on the corrosion performance of chromate coatings on galvanized steel

Characterization and Corrosion Resistance of Galvanized Steel/Passivation Composite/ Polyurethane Paint Systems

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