Impedance inversion method constrained with crosswell seismic data

Cao, Danping; Yin, Xingyao; Zhang, Fanchang

doi:10.1190/1.3603786

Cited by 16 publications

(22 citation statements)

References 2 publications

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“…All the Nyquist plots display two capacitive loops in the high-frequency region and an inductive loop in the low-frequency region, which is similar to the EIS features of other Mg alloys [ 59 ]. The capacitive loops are related to the processes in the surface film and the electrical double layer [ 60 ], and the inductive loop should be attributed to the initiation of the localized corrosion on the surface of the cast ZK60 alloy according to [ 61 , 62 , 63 ]. Based on these EIS features, Figure 11 presents an equivalent circuit to fit the EIS results in Figure 10 a [ 58 , 59 , 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Peng

et al. 2020

Materials

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In this work, the effects of the microstructure and phase constitution of cast magnesium alloy ZK60 (Mg-5.8Zn-0.57Zr, element concentration in wt.%) on the corrosion behavior in aqueous NaCl (0.1 mol dm−3) were investigated by weight-loss measurements, hydrogen evolution tests, and electrochemical techniques. The alloy was found to be composed of α-Mg matrix, with large second-phase particles of MgZn2 deposited along grain boundaries and a Zr-rich region in the central area of the grains. The large second-phase particles and the Zr-rich regions were more stable than the Mg matrix, resulting in a strong micro-galvanic effect. A filiform corrosion was found. It originated from the second-phase particles in the grain boundary regions in the early corrosion period. The filaments gradually occupied most areas of the alloy surface, and the general corrosion rate decreased significantly. Corrosion pits were developed under filaments. The pit growth rate decreased over time; however, it was about eight times larger than the general corrosion rate. A schematic model is presented to illustrate the corrosion mechanism.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Peng

et al. 2020

Materials

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“…In the figure, the anodic polarization curves at the monitoring points approximate a straight line and are close in slope. The curve shape is similar to the cathodic polarization curve in the strong polarization area [ 18 ]. This is because each monitoring point is in oxygen deficit at the end of soaking and the measured equilibrium potential has been moved to the cathodic strong polarization area.…”

Section: Resultsmentioning

confidence: 77%

“…EIS tests were conducted at the rest potential in the frequency range of 10 −3 Hz to 10 6 Hz using signal amplitude of 5 mV. The real part (Z re ) and the imaginary part (Z im ) of the sensor cell impedance were recorded [ 18 ]. It is worth noting that the charging of a discontinuous, inhomogeneous interface between the cement mortar and the steel anode leads to a Constant Phase-angle Element (CPE)-like response.…”

Section: Methodsmentioning

confidence: 99%

A New Corrosion Sensor to Determine the Start and Development of Embedded Rebar Corrosion Process at Coastal Concrete

Jin

2013

Sensors

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The corrosion of reinforcements induced by chloride has resulted to be one of the most frequent causes of their premature damage. Most corrosion sensors were designed to monitor corrosion state in concrete, such as Anode-Ladder-System and Corrowatch System, which are widely used to monitor chloride ingress in marine concrete. However, the monitoring principle of these corrosion sensors is based on the macro-cell test method, so erroneous information may be obtained, especially from concrete under drying or saturated conditions due to concrete resistance taking control in macro-cell corrosion. In this paper, a fast weak polarization method to test corrosion state of reinforcements based on electrochemical polarization dynamics was proposed. Furthermore, a new corrosion sensor for monitoring the corrosion state of concrete cover was developed based on the proposed test method. The sensor was tested in cement mortar, with dry-wet cycle tests to accelerate the chloride ingress rate. The results show that the corrosion sensor can effectively monitor chloride penetration into concrete with little influence of the relative humidity in the concrete. With a reasonable corrosion sensor electrode arrangement, it seems the Ohm-drop effect measured by EIS can be ignored, which makes the tested electrochemical parameters more accurate.

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“…Where n is a constant, Y 0 (in Ω −1 ·cm −2 ·s −n ) is a parameter derived from the capacitance C (in F), and w is the frequency. In light of the interfacial properties of the built-in electrodes in the previously described sensor system, the impedance can be simplified, according to Figure 2 , and written as follows [ 24 ]:

…”

Section: Methodsmentioning

confidence: 99%

Corrosion Sensor for Monitoring the Service Condition of Chloride-Contaminated Cement Mortar

Lü

Ba²

2010

Sensors

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A corrosion sensor for monitoring the corrosion state of cover mortar was developed. The sensor was tested in cement mortar, with and without the addition of chloride to simulate the adverse effects of chloride-contaminated environmental conditions on concrete structures. In brief, a linear polarization resistance method combined with an embeddable reference electrode was utilized to measure the polarization resistance (Rp) using built-in sensor electrodes. Subsequently, electrochemical impedance spectroscopy in the frequency range of 1 kHz to 50 kHz was used to obtain the cement mortar resistance (Rs). The results show that the polarization resistance is related to the chloride content and Rs; ln (Rp) is linearly related to the Rs values in mortar without added chloride. The relationships observed between the Rp of the steel anodes and the resistance of the surrounding cement mortar measured by the corrosion sensor confirms that Rs can indicate the corrosion state of concrete structures.

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Impedance inversion method constrained with crosswell seismic data

Cited by 16 publications

References 2 publications

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

A New Corrosion Sensor to Determine the Start and Development of Embedded Rebar Corrosion Process at Coastal Concrete

Corrosion Sensor for Monitoring the Service Condition of Chloride-Contaminated Cement Mortar

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