Corrosion Detection of Mild Steel in a Two-Phase Hydrocarbon/Electrolyte System under Flow Conditions Using Electrochemical Noise

Malo, J. M.; Uruchurtu, J.; Corona, Oscar

doi:10.5006/1.3280783

Cited by 12 publications

(4 citation statements)

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“…At Fig. 7 the evolution of interference maxima as a function of time is presented and as it can be observed, a logistic experimental behavior growth seems to be exposed; such a behavior has been also observed for hydrocarbon-brine systems where certain oxides grow for short periods of time (2). As a way to prove such a simple logistic growing model a numerical adjustment (line) using program simulation was realized for experimental data This adjustment is based on the well known ecological differential equation for a density-dependent population, i.e.…”

Section: Resultssupporting

confidence: 55%

“…The beginning of such a process is considered as an unpredictable event due to its dynamics which exhibits apparently random fluctuations, requiring a full understanding of the mechanisms which controls it, as same as its interactions (1). On the other hand, it is already known how growth-competition theoretical models are commonly used in several scientific areas as chemistry and biology; concerning corrosion, some growth models have bee used to explain oxidation phenomena and also certain anodic and cathodic metallic surface reactions can be considered as competition processes (2). For the aforementioned, we are presenting in this work new experimental results obtained by optical monitoring of an interference pattern reflected from pure aluminum sample immersed into a chloride solution which associated consecutive interferograms as a function of time, were related with electrochemical simultaneous tests and later digitally processed to obtain the oxide corrosion layer thickness by means of an alternative interferometric method.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of System Dynamics in a Corrosion Process by Optical and Electrochemical Methods

2008

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A brief investigation is presented in an electrochemical corrosion cell consisting of 99.5% aluminum sample immersed in 3% NaCl and hydrocarbon-chloride solution emulsion, which reaction processes were optically monitored using Michelson interferometry. An image processing method applied on obtained interferograms allowed to calculate oxide corrosion layer thickness formed over the metal surface. Additionally a theoretical model consisting of a two bi-dimensional difference equation system is proposed, in order to explain evolution of optical interference pattern maxima observed as a function of time for corrosion process, and also to establish a growth-competition model for the maxima fringes evolution and consequently for the oxide layer and corrosion system dynamics. Bifurcation diagrams showing equation system solution regions were additionally obtained based on the nonlinear dynamic behavior of corrosion processes showing chaotic dynamics.

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Investigation of System Dynamics in a Corrosion Process by Optical and Electrochemical Methods

2008

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“…Similar developments have been performed in electrochemistry with the electrochemical noise (EN) in two-phase flows consisting in measuring the fluctuations of current, potential or electrolyte resistance (ER) generated by the presence of a solid, liquid or gaseous phase dispersed in a conductive electrolyte. The EN technique is able to provide information on the elementary events at the origin of the fluctuations, such as the position, velocity, trajectory, and residence time of a particle in front of or in contact with a sensor [45,46], the composition of an oil-in-water emulsion [47], the detachment frequency and size of evolving bubbles [48], the activity of pitting corrosion in multiphase flows [49], etc. For particles flowing in a channel, the ER fluctuations give direct information on the changes in electrolyte conductivity due to the passage of particles between the electrodes.…”

Section: Introductionmentioning

confidence: 99%

Detection and sizing of single droplets flowing in a lab-on-a-chip device by measuring impedance fluctuations

Yakdi

Huet

Ngo

2016

Sensors and Actuators B: Chemical

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International audienceThis paper is devoted to the evaluation of the electrochemical noise technique consisting in measuring the fluctuations of the electrolyte resistance (ER) between two metallic electrodes immerged in a conductive electrolyte to detect and characterize single particles circulating in a microfluidic device, without the help of optical measurements that require good visibility of the detection region. Numerical simulations were performed with the finite element method to study the influence of the dimensions of the channel and the electrodes on the ER. Measurements of the ER variations due to the passage of oil droplets and plugs passing between the electrodes were carried out. Excellent agreement was obtained between the theoretical and experimental ER transients, which allowed the velocity and diameter of the oil droplets to be estimated with an accuracy of a few percents in the case of droplet diameters ranging from 60 to 100 m. According to the numerical simulations and the amplitude of the background noise, oil droplets of diameter larger than 20-25 m can be detected in the microchannel used (cross section of 100 m  100 m and 100 m  100 m electrodes separated by a gap of 100 m). Developments of smaller microfluidic devices are under progress to detect and characterize particles of a few micrometers, such as biological cells for example

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“…Existen diversos métodos de análisis de las señales de ruido electroquímico, tales como: visual, estadístico, análisis en frecuencia y los métodos dinámi-cos no lineales [3][4][5][6][7] . La investigación ha mostrado las bondades inherentes a la técnica durante la monitorización, en línea y tiempo real, de la corrosión en procesos industriales [8][9][10] .…”

Section: Introductionunclassified

Ruido electroquímico de la erosión-corrosión en cobre: su relación con los parámetros hidrodinámicos

Castañeda¹,

Romero²,

Malo³

et al. 2010

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ResumenEn este trabajo se presentan los resultados de los efectos del deterioro a la integridad superficial, de muestras de cobre de pureza comercial, debido al fenómeno de erosión-corrosión en presencia de un fluido que contiene partículas de sílice de diversos tamaños, usando la técnica de ruido electroquímico. Esto, en función de los parámetros hidrodinámicos del sistema (movimiento del fluido). Utilizando un electrodo de cilindro rotatorio (CR) modificado con tres anillos, se posibilitó a manejarlo empleando dos velocidades de giro (880 y 1.750 rpm y números de Reynolds de 1.486 Re y 2.972 Re, respectivamente). Se encontró patrones característicos de ruido electroquímico en función del régimen de flujo laminar y de transición turbulenta; así como de intensidades de daño en la superficie del material, teniendo una relación con los patrones de ruido electroquímico observados. Se presenta un ataque más uniforme y un aumento del impacto para las partículas de mayor tamaño y una intensidad menor de erosión en la superficie expuesta, con una forma de ataque más localizado para las partículas de menor tamaño. El estudio del fenómeno de erosión-corrosión presenta patrones de identificación de ruido electroquímico de corriente y de potencial característicos, de acuerdo al régimen de flujo laminar o de transición turbulenta y a la adición de diferentes tamaños de partículas sólidas de alúmina y sílice. Palabras claveErosión corrosión; Disco rotatorio; Espectro; Ruido electroquímico. Electrochemical noise of the erosion-corrosion of copper in relation with its hydrodynamic parameters AbstractThis work presents the electrochemical noise results obtained of the surface degradation on copper, due to erosion corrosion phenomena, which were a function of the hydrodynamic parameters of the system (fluid movement). A modified rotating cylinder (RC) comprising three ring electrodes under two rotating speeds (880 and 1750 rpm with a Reynolds numbers 1486 Re and 2972 Re, respectively) were used. Characteristic electrochemical noise spectra as a function of the hydrodynamic parameters were found, as well as surface attack intensities the noise signal. An increase and a more uniform attack due to particle impact was related to larger particle size and lesser erosion corrosion intensity, in the form of more localized attack over the surface, was obtained for smaller ones. Erosion corrosion attack presents characteristic electrochemical current and potential noise signals, according to the laminar or transitional turbulent regime and particle size added. KeywordsErosion corrosion; Rotating disk; Spectra; Electrochemical noise. INTRODUCCIÓNLa erosión-corrosión es la aceleración e incremento en la tasa de deterioro o ataque en un sustrato metálico, debido al movimiento relativo entre un fluido corrosivo que contiene partículas erosivas y la superficie metálica. Mecánicamente, se puede asociar la eliminación física de películas protectoras seguida de la de material metálico de la superficie del sustrato, que dan como resultado un subse...

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Corrosion Detection of Mild Steel in a Two-Phase Hydrocarbon/Electrolyte System under Flow Conditions Using Electrochemical Noise

Cited by 12 publications

References 1 publication

Investigation of System Dynamics in a Corrosion Process by Optical and Electrochemical Methods

Investigation of System Dynamics in a Corrosion Process by Optical and Electrochemical Methods

Detection and sizing of single droplets flowing in a lab-on-a-chip device by measuring impedance fluctuations

Ruido electroquímico de la erosión-corrosión en cobre: su relación con los parámetros hidrodinámicos

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