Fundamentals of Electrochemical Corrosion

Stansbury, E.E.; Buchanan, R. A.

doi:10.31399/asm.tb.fec.9781627083027

Cited by 321 publications

(195 citation statements)

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“…The Tafel region is characterized by linear dependence of i corr on E corr . Figure 1 shows Tafel extrapolation of the Tafel region (linear part of the anodic branch of the polarization curve) which is used to evaluate potentiodynamic characteristics to obtain the corrosion current I corr from which the corrosion current density i corr can be calculated (i corr = I corr /specimen area immersed in the corrosion environment) [ 70 , 71 ].…”

Section: Introductionmentioning

confidence: 99%

“…There are some other limitations for the Tafel analysis of the polarization curve caused by the mechanism of the corrosion process. The cathodic branch of the polarization curve cannot be used for Tafel analysis when the corrosion is under diffusion control; decreasing potential enters into the diffusion control region or the nature of the interface changes with the changing potential [ 70 , 71 ].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy

et al. 2016

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Linear polarization is a potentiodynamic method used for electrochemical characterization of materials. Obtained values of corrosion potential and corrosion current density offer information about material behavior in corrosion environments from the thermodynamic and kinetic points of view, respectively. The present study offers a comparison of applications of the linear polarization method (from −100 mV to +200 mV vs. EOCP), the cathodic polarization of the specimen (−100 mV vs. EOCP), and the anodic polarization of the specimen (+100 mV vs. EOCP), and a discussion of the differences in the obtained values of the electrochemical characteristics of cast AZ91 magnesium alloy. The corrosion current density obtained by cathodic polarization was similar to the corrosion current density obtained by linear polarization, while a lower value was obtained by anodic polarization. Signs of corrosion attack were observed only in the case of linear polarization including cathodic and anodic polarization of the specimen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy

et al. 2016

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“…The production of hydrogen in this experiment indicates that the reactions in all systems containing the steels occurred in an anaerobic solution. In general, the corrosion of a metal, M, in an anaerobic solution is governed by the following simplest reactions (Stansbury and Buchanan 2000). …”

Section: Resultsmentioning

confidence: 99%

Identification of chemical form of stable carbon released from type 304L and 316L stainless-steel powders in alkaline and acidic solutions under low-oxygen conditions

Nakabayashi

Fujita

2018

Radiocarbon

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The chemical form of 14 C released from irradiated stainless steel is a key parameter in the safety assessment of the subsurface disposal system in Japan. In this study, to identify the chemical form of the released carbon, unirradiated stainless-steel powders, which were found to be water-atomized powders with a silicon oxide film, were immersed in NaOH and HCl solutions under low-oxygen conditions for approximately 25 days. The results showed that the main chemical forms of the carbon were colloidal carbon in the NaOH solution and colloidal carbon and formic and acetic acids in the HCl solution. Almost no hydrocarbons were detected in both solution systems. Concerning the source of the colloidal carbon and carboxylic acids, the hypothesis that carbon in the oxide layer is released is considered to be reasonable. The very small amounts of hydrocarbons generated prevented us from discussing the source of the hydrocarbons. To validate the hypothesis and obtain further information on the hydrocarbons, additional experiments are necessary. In particular, for long-term safety assessment, it is important to determine whether the colloidal carbon, carboxylic acids and hydrocarbons are continuously released during the corrosion process. Therefore, information on the temporal evolution of the carbon should be obtained.

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“…Corrosion is a vital aspect that should be considered in any engineering system to maintain process performance and prevent systems failure [ 24 ]. In the US, corrosion cost had a share of 6% of its gross domestic products (GDP) [ 25 ], while globally it accounts for 3.4% of the global GDP [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

2020

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The inhibition behavior of carbon nanotubes (CNTs) and Gum Arabic (GA) on the corrosion of 316L stainless steel in CNTs–water nanofluid under the effect of different temperatures was investigated by electrochemical methods and surface analysis techniques. Thereby, 316L stainless steel samples were exposed to CNTs–water nanofluid under temperatures of 22, 40, 60 and 80 °C. Two concentrations of the CNTs (0.1 and 1.0 wt.% CNTs) were homogenously dispersed in deionized water using the surfactant GA and tested using three corrosion tests conducted in series: open circuit test, polarization resistance test, and potentiodynamic scans. These tests were also conducted on the same steel but in solutions of GA-deionized water only. Tests revealed that corrosion increases with temperature and concentration of the CNTs–water nanofluids, having the highest corrosion rate of 32.66 milli-mpy (milli-mil per year) for the 1.0 wt.% CNT nanofluid at 80 °C. In addition, SEM observations showed pits formation around areas of accumulated CNTs that added extra roughness to the steel sample. The activation energy analysis and optical surface observations have revealed that CNTs can desorb at higher temperatures, which makes the surface more vulnerable to corrosion attack.

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Fundamentals of Electrochemical Corrosion

Cited by 321 publications

References 0 publications

Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy

Comparison of Electrochemical Methods for the Evaluation of Cast AZ91 Magnesium Alloy

Identification of chemical form of stable carbon released from type 304L and 316L stainless-steel powders in alkaline and acidic solutions under low-oxygen conditions

Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

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