Determination of Coating Deterioration with EIS: I. Basic Relationships

Mansfeld, F.; Tsai, Chia-Lung

doi:10.5006/1.3585209

Cited by 222 publications

(62 citation statements)

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“…9 has been proposed. R o is the ionic resistance of the electrolyte; Q Al , represents the capacity of the alumina scale; R i , is the ionic resistance of the alumina layer due to the ion migration transport through paths or microdefects of this layer allowing the connection between the electrolytic medium and the base material 22) ; R tc , is the charge transfer resistance associated with the electrochemical process; and finally, Q dc , represents the double layer capacity of the metallic substrate. The last one parameters, R tc and Q dc , contribute only in the impedance diagrams when there is a connection between aggressive medium and metallic substrate through microdefects in the alumina layer.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Sandblasting on the Oxidation and Corrosion Behaviour of an Oxide-Dispersed Strengthened (ODS) FeCrAl Alloy.

et al. 2001

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Metallic biomaterials are preferred for replacements of the hard tissues since they are the most suitable to withstand the mechanical loads. For same components the higher surface roughness is preferred to increase the adherence and anchorage between the implant and the bone. In this work sandblasting prior to the oxidation is used to increase the surface roughness of the oxide dispersion strengthened (ODS) FeCrAl alloy. The effect of sandblasting on its oxidation and corrosion behaviour is studied. As a comparison, polished samples are also studied. The alloy treated at 1 100°C generates a dense a-alumina layer which thickness increases with increasing exposure time, being the values somewhat lower for the sandblasted samples. Impedance diagrams obtained for sandblasted samples preoxidised for 1 and 3 h show impedance values at the lowest frequency two orders of magnitude lower than those for polished samples. This decrease in the impedance value can be attributed to the presence of paths or fine cracks in the alumina layer that communicate the aggressive medium with the metallic substrate. Spallation of the alumina layer in preoxidised sandblasted samples has been detected by electrochemical impedance spectroscopy for treatment times of 10 and 100 h. Despite this loss of the scale integrity, the corrosion behaviour is good.

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Section: Discussionmentioning

confidence: 99%

“…These slight deviations are due to the presence of microdefects in the alumina layer. 22,[27][28][29] However, the magnitude of these microdefects is so small that the corrosion reaction is not produced.…”

Section: Discussionmentioning

confidence: 99%

Effect of Sandblasting on the Oxidation and Corrosion Behaviour of an Oxide-Dispersed Strengthened (ODS) FeCrAl Alloy.

et al. 2001

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“…In the high frequency region a small radius arc occurs, and the lower frequency region appears to have a larger radius. Information of high frequency arc corresponds to coating, linear low frequency part of the corresponding interface information 10 . The obvious passivation characteristics of steel bar in concrete is high frequency and low frequency region appeared two capacitive arcs and low frequency capacitance arc is closely to a straight line [11][12][13][14] .…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Study of ZINTEK Coated Steel Bars in Magnesium Cement Concrete

Wang¹,

Huang²,

Gong³

et al. 2017

dtmse

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Abstract:In order to solve the corrosion problem of steel bar in magnesium cement concrete, coating is proposed to protect steel bar from corrosion, and then to promote its application in the construction of the West Saline Lake and the saline soil area. Steel bar that in magnesium cement concrete is processed by ZINTEK coating and then a one-year electrochemical experiment was conducted by the CS350 electrochemical workstation on blocks in three environments, which are in the natural environment, water and magnesium chloride solution. Finally the polarization curves and electrochemical impedance spectra were analyzed by combining theory with experiment. The results show that the ZINTEK coated steel bars can be well protected from corrosion, and the corrosion current density of 360d shows that it is in a low corrosion stage. The corrosion current density is reduced with the growth of magnesium cement concrete protection layer thickness and coated steel bar corrosion current density of 50cm protective layer thickness is half an order of magnitude smaller than the thickness of 25cm.

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“…What is more, this improved model fails to reflect the detail of the coating degradation process. Finally, the prediction cycles of improved degradation kinetics model obtained by Equation (14) are listed in Table 2. The final forecast cycles were also obtained by rounding the computational forecast cycles and negative results were considered as invalid prediction.…”

Section: Improved Degradation Kinetics Modelmentioning

confidence: 99%

Investigation of Service Life Prediction Models for Metallic Organic Coatings Using Full-Range Frequency EIS Data

Ran

Dai

et al. 2017

Metals

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Abstract:Various service life prediction models of organic coatings were analyzed based on the acquirement of the measurement of Electrochemical Impedance Spectroscopy (EIS) from indoor accelerated tests. First, some theoretical formulas on corrosion lifetime predictions of coatings were introduced, followed by the comparative assessment of four practical prediction models in view of prediction accuracy in application. The prediction from impedance data at single low frequency |Z| 0.1 Hz , the classical degradation kinetics, and proposed improved degradation kinetics model, as well as a self-organized neural network prediction based on sample detection, were focused in this paper. The standard AF1410 plates employed as the metallic substrates were coated with sprayed zinc layer, epoxy-ester primer and polyurethane enamel layer. The accelerated experiments which mimicked coastal areas of China were carried out with the specimens after surface treatment. The assessment of results showed that the proposed improved degradation kinetics model and neural network classification model based on the full range of frequency data obviously have higher prediction accuracies than the traditional degradation kinetics model, and the prediction precision of the sample detection-based neural network classification was the highest among these models. The study gives some insights for coating degradation lifetime prediction which may be useful and supportive for practical applications.

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Determination of Coating Deterioration with EIS: I. Basic Relationships

Cited by 222 publications

References 0 publications

Effect of Sandblasting on the Oxidation and Corrosion Behaviour of an Oxide-Dispersed Strengthened (ODS) FeCrAl Alloy.

Effect of Sandblasting on the Oxidation and Corrosion Behaviour of an Oxide-Dispersed Strengthened (ODS) FeCrAl Alloy.

Electrochemical Study of ZINTEK Coated Steel Bars in Magnesium Cement Concrete

Investigation of Service Life Prediction Models for Metallic Organic Coatings Using Full-Range Frequency EIS Data

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