Interpreting Nyquist responses from defective coatings on steel substrates

Thompson, Ian; Campbell, Dave

doi:10.1016/0010-938x(94)90119-8

Cited by 88 publications

(31 citation statements)

References 10 publications

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“…The presence of this two semicircles is related to the fact that different processes are taking place on the working electrode surface. As seen previously in the literature (15), this result suggests that the system can not be defined simply by a Randless circuit. The semicircle at high frequency valúes is associated with the formation of a layer on the working electrode surface.…”

Section: Geary Equation (I^^^ = B/r^)supporting

confidence: 80%

Corrosion study of the passive film of amorphous Fe-Cr-Ni-(Si, P, B) alloys

López¹,

Escudero²,

Vida³

et al. 1996

REVMETAL

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Amorphous Fe62CrioNÍ8X2o (X = P, B, Si) alloys in O.OIM HCl solution have been investigated by means of standard electrochemical measurements in order to evalúate their corrosión resistance. The study reveáis that the best corrosión behaviour is given by the Si containing amorphous alloy. X-ray photoelectron spectroscopy (XPS) and Auger electrón spectroscopy (AJES) have been employed to study the composition of the passive layers, formed on the surface of the different amorphous alloys.The results on Fe52CrioNÍ8SÍ2o show that a protective passive film, mainly consisting of oxidized chromium, greatly enhances its corrosión resistance.Keywords: Amorphous alloys. Corrosión. EIS. Photoemission. Passive layer.Estudio del comportamiento frente a la corrosión de las capas pasivas formadas sobre las aleaciones amorfas Fe-Gr-Ni-(Si, P, B)Resumen La resistencia a la corrosión de las aleaciones amorfas Fe62CrioNÍ8X2o (X = P, B, Si) inmersas en HCl 0,01M se evaluó usando técnicas electroquímicas. Las técnicas de espectroscopia de fotoemisión de rayos X y espectroscopia Auger se emplearon para estudiar la composición de las capas pasivas, formadas en aire sobre la superficie de las aleaciones amorfas. Del estudio realizado se concluye que el mejor comportamiento frente a la corrosión viene dado por la aleación amorfa que contiene como metaloide Si. Esto es debido a que la capa pasiva de dicha aleación está formada principalmente de óxido de cromo, lo cual confiere una alta resistencia a la corrosión.Palabras clave: Aleaciones amorfas. Corrosión. EIS. Fotoemisión. Capa pasiva.

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Section: Geary Equation (I^^^ = B/r^)supporting

confidence: 80%

Corrosion study of the passive film of amorphous Fe-Cr-Ni-(Si, P, B) alloys

López¹,

Escudero²,

Vida³

et al. 1996

REVMETAL

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“…Corrosion products for zinc and carbon steel in marine and marine-industrial environments after two years of exposure which are the kind of diagrams typical of organic metal covering systems (paints) such as can be seen in Figs. 3-a to 6-a. The interpretation of the impedance diagrams is made complicated by the fact that there are small defects or pitting of the covering whether the covering be organic or a layer of corrosion products [54]. Theoretically, a Nyquist diagram of a covering with defects should consist of two semi-circles, one at high frequencies due to the covering and the other at low frequencies due to the cell formed by the defect, although in some cases there may be only one semi-circle.…”

Section: Resultsmentioning

confidence: 99%

EIS characterisation of the layer of corrosion products on various substrates in differing atmospheric environments

Rodríguez

Alvarez

Gonzalez³

2006

Materials & Corrosion

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The layer of corrosion products forming on zinc in atmospheric environments of varying aggressivity have been characterised and compared with previous results obtained for carbon steel. The characteristics of said layers have been linked to the nature of the products found. Likewise, we have found that EIS is a useful tool towards characterising the layers of corrosion products of carbon steel and zinc. The equivalent circuit which gives the best fit of impedance data for both metals is type R(C(R(C(R(CR))))), where the Nyquist diagrams are composed of two time constants. It is observed that the value of the capacitance of the corrosion product layer (C pc ) diminishes as the time of exposure increases, which is directly related with an increase in the thickness of the corrosion product layer. Also, it is observed that when the nature of the corrosion products doesn't vary with the time of exposure, the decrease of the charge transfer resistance is related with the increase in the thickness of the corrosion product layer.

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“…The capacitance can be calculated from the experimentally determined CPE parameters by the equation C = ω n−1 Y 0 sin(nπ /2) [22] where ω(= 2π f) is the angular frequency. The factor n, defined as the CPE power, is an adjustable parameter that lies between 0 and 1, and can be used as the measure of the surface inhomogeneity, the decrease of which is connected with a certain increase in the solid surface roughening.…”

Section: Eis Measurementmentioning

confidence: 99%

Fabrication and anti‐corrosion property of superhydrophobic hybrid film on copper surface and its formation mechanism

Chen

et al. 2009

Surface & Interface Analysis

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Compact and uniform superhydrophobic films were prepared on copper substrates using one-step solution-immersion process, and the appropriate preparation conditions were selected for mixed solutions. SEM shows that the hybrid film of 1-dodecanethiol and tetradecanoic acid on copper substrate is more compact with the contact angle of 160• . The electrochemical impedance spectroscopy and polarization test demonstrate that the anti-corrosion property of surface-modified copper substrate is greatly improved, especially for the hybrid film. Moreover, the competitive adsorption process and adsorptive geometry of hybrid film were well explained based on the results of quantum chemistry calculations, SEM, and energy dispersive X-ray analysis.

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Interpreting Nyquist responses from defective coatings on steel substrates

Cited by 88 publications

References 10 publications

Corrosion study of the passive film of amorphous Fe-Cr-Ni-(Si, P, B) alloys

Corrosion study of the passive film of amorphous Fe-Cr-Ni-(Si, P, B) alloys

EIS characterisation of the layer of corrosion products on various substrates in differing atmospheric environments

Fabrication and anti‐corrosion property of superhydrophobic hybrid film on copper surface and its formation mechanism

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