MEASURING ELECTROCHEMICAL NOISE RESISTANCE FROM A WIRE BEAM ELECTRODE SURFACE FOR CORROSION RATE AND PATTERN DETERMINATION

2003 ◽  
Vol 03 (04) ◽  
pp. L419-L432 ◽  
Author(s):  
YONG-JUN TAN
Keyword(s):  
Electrode Surface ◽  
Electrochemical Noise ◽  
Electrode Array ◽  
Current Method ◽  
Low Noise ◽  
Noise Resistance ◽  
Galvanic Current ◽  
Corrosion Rates ◽  
Pattern Determination ◽  
Wire Beam Electrode

Electrochemical noise resistance (Rn), a new means of determining corrosion rates, has been considered to have only limited value since it offers little that cannot be achieved by conventional electrochemical methods. Aiming at overcome this limitation, a novel technique has been developed by combining the Rn method and an electrochemically-integrated electrode array namely the wire beam electrode (WBE). This combined Rn-WBE method effectively has extended the applicability of the Rn method from a uniform electrode surface to a nonuniform electrode surface. This present work is designed to examine the advantages and limitations of the Rn-WBE method in determining corrosion rates and patterns. The Rn-WBE method, together with other WBE based methods, was applied to corrosion systems of different characteristics. It was found that the Rn-WBE method has advantages over other WBE based methods when applying to a relatively uniform WBE surface. Both Rn-WBE method and the WBE based overpotential-galvanic current method were found to be similarly applicable to nonuniform WBE surfaces. However, the Rn-WBE method was found not applicable to low noise level corrosion systems. Some related issues regarding Rn calculation such as trend removal have also been clarified in this paper.

Transient Analysis and Simulation of Pitting Corrosion for the Estimation of Noise Resistance

CORROSION ◽  
2000 ◽  
Vol 56 (9) ◽  
pp. 928-934
Author(s):  
G. Miramontes de León ◽  
D. C. Farden ◽  
D. E. Tallman
Keyword(s):  
Computer Simulation ◽  
Pitting Corrosion ◽  
Transient Analysis ◽  
Electrochemical Noise ◽  
Electrochemical Impedance ◽  
Transient Behavior ◽  
Noise Resistance ◽  
New Approach ◽  
Noise Data ◽  
Current Transients

Abstract A new approach for the measurement of noise resistance based on the transient behavior of pitting corrosion is presented. Potential noise and current transients have been recognized as a characteristic behavior of pitting corrosion. This new approach uses the transient information present during corrosion as a way to estimate the noise resistance of coated metals directly. Computer simulation and analytical results are presented, indicating that the new technique can be applied to the problem of noise resistance estimation. This new approach was applied to experimental electrochemical noise data obtained with commercial electrochemical impedance spectroscopy (EIS)/electrochemcial noise measurement (ENM) equipment.

scholarly journals Corrosion Behavior of Al in Ethanol–Gasoline Blends

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5544
Author(s):  
Alfredo Brito-Franco ◽  
Jorge Uruchurtu ◽  
Isai Rosales-Cadena ◽  
Roy Lopez-Sesenes ◽  
Sergio Alonso Serna-Barquera ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Sugar Cane ◽  
Electrochemical Noise ◽  
Electrochemical Impedance ◽  
Pure Aluminum ◽  
Electrochemical Techniques ◽  
Intermediate Compound ◽  
Corrosion Process ◽  
Corrosion Rates ◽  
Adsorption Desorption

The corrosion behavior of pure aluminum (Al) in 20 v/v% ethanol–gasoline blends has been studied using electrochemical techniques. Ethanol was obtained from different fruits including sugar cane, oranges, apples, or mangos, whereas other techniques included lineal polarization resistance, electrochemical noise, and electrochemical impedance spectroscopy for 90 days. Results have shown that corrosion rates for Al in all the blends were higher than that obtained in gasoline. In addition, the highest corrosion rate was obtained in the blend containing ethanol obtained from sugar cane. The corrosion process was under charge transfer control in all blends; however, for some exposure times, it was under the adsorption/desorption control of an intermediate compound. Al was susceptible to a localized, plotting type of corrosion in all blends, but they were bigger in size and in number in the blend containing ethanol obtained from sugar cane.

scholarly journals Extracellular Electrophysiology in the Prostate Cancer Cell Model PC-3

Sensors ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 139 ◽  
Author(s):  
Miguel Cabello ◽  
Haobo Ge ◽  
Carmen Aracil ◽  
Despina Moschou ◽  
Pedro Estrela ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Electrical Activity ◽  
Cell Model ◽  
Treatment Strategies ◽  
Electrode Array ◽  
Cellular Level ◽  
Low Noise ◽  
Cellular Growth ◽  
Male Population ◽  
Depth Analysis

Although prostate cancer is one of the most common cancers in the male population, its basic biological function at a cellular level remains to be fully understood. This lack of in depth understanding of its physiology significantly hinders the development of new, targeted and more effective treatment strategies. Whilst electrophysiological studies can provide in depth analysis, the possibility of recording electrical activity in large populations of non-neuronal cells remains a significant challenge, even harder to address in the picoAmpere-range, which is typical of cellular level electrical activities. In this paper, we present the measurement and characterization of electrical activity of populations of prostate cancer cells PC-3, demonstrating for the first time a meaningful electrical pattern. The low noise system used comprises a multi-electrode array (MEA) with circular gold electrodes on silicon oxide substrates. The extracellular capacitive currents present two standard patterns: an asynchronous sporadic pattern and a synchronous quasi-periodic biphasic spike pattern. An amplitude of ±150 pA, a width between 50–300 ms and an inter-spike interval around 0.5 Hz characterize the quasi-periodic spikes. Our experiments using treatment of cells with Gd3⁺, known as an inhibitor for the Ca2⁺ exchanges, suggest that the quasi-periodic signals originate from Ca2⁺ channels. After adding the Gd3⁺ to a population of living PC-3 cells, their electrical activity considerably decreased; once the culture was washed, thus eliminating the Gd3⁺ containing medium and addition of fresh cellular growth medium, the PC-3 cells recovered their normal electrical activity. Cellular viability plots have been carried out, demonstrating that the PC-3 cells remain viable after the use of Gd3⁺, on the timescale of this experiment. Hence, this experimental work suggests that Ca2⁺ is significantly affecting the electrophysiological communication pattern among PC-3 cell populations. Our measuring platform opens up new avenues for real time and highly sensitive investigations of prostate cancer signalling pathways.

Localized Corrosion of 304 Stainless Steel under a NaCl Droplet

2011 ◽  
Vol 480-481 ◽  
pp. 443-447
Author(s):  
Yan Hua Wang ◽  
Yuan Yuan Liu
Keyword(s):  
Stainless Steel ◽  
Corrosion Rate ◽  
Corrosion Potential ◽  
Corrosion Process ◽  
Localized Corrosion ◽  
304 Stainless Steel ◽  
Galvanic Current ◽  
Cooperative Effects ◽  
Electrochemical Parameters ◽  
Wire Beam Electrode

The distributions of corrosion potential and galvanic current of 304 stainless steel under a NaCl droplet were studied by using the wire beam electrode (WBE). It was found that the distributions of the electrochemical parameters were heterogeneous with isolated anodic and cathodic zones appeared randomly. During the corrosion process, the polarity of some anodes changed with the evolution of time. The localized corrosion rate and heterogeneity increased firstly, and then decreased afterward with the increase of time, which can be attributed to the cooperative effects of the aggressive ions and the corrosion products.

Research on Effects of Inhibitors on Anti-Corrosion Performance of Reinforced Bar in the Concrete

2011 ◽  
Vol 239-242 ◽  
pp. 1195-1198 ◽  
Author(s):  
Liu Bin Song ◽  
Dao Wu Yang ◽  
Zhong Liang Xiao ◽  
Feng Zhang
Keyword(s):  
Open Circuit Potential ◽  
Electrode Array ◽  
Open Circuit ◽  
Reinforcing Bars ◽  
Corrosion Performance ◽  
Cement Concrete ◽  
Corrosive Media ◽  
Reinforcing Bar ◽  
Wire Beam Electrode ◽  
The Impact

The corrosion behavior of reinforcing bars in concrete was studied by simulating the 4×4 wire-beam electrode array. Different inhibitors were added to reinforced concrete. By measuring the open-circuit potential of an iron wire, the impact of different inhibitors on the corrosion of rebar in the concretes was studied after immersion in NaCl solution. The result showed that best protection was achieved by adding NaNO2 and aniline as inhibitors jointly to the concrete, as this combination maintained the open-circuit potential within the passivation range at all times, so ensuring the integrity of the passive membrane. By addition of this combination of the inhibitors, the compactibility of the cement concrete structure can be increased, thereby protecting the reinforcing bar against the external corrosive media.

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