Alternating-Current Electrolysis

Hayden,

doi:10.1109/t-aiee.1907.4764788

Cited by 11 publications

(4 citation statements)

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“…AC current on the corrosion rate impact is much smaller than the DC current [2][3], but not simply regarded as negligible metal corrosion caused by the AC current. Experiments show that the presence of AC current can cause depolarization of the electrode surface to aggravate the pipeline corrosion, accelerate the aging of the coating, causing the coating peeling [4].…”

Section: Ac Stray Current Corrosion Testmentioning

confidence: 99%

Study on AC Stray Current Corrosion Law of Buried Steel Pipelines

Wang

Yang

Huang

et al. 2012

AMM

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AC stray current can cause AC corrosion and destroy the safe operation of buried pipelines, which comes mainly from nearby high voltage transmission lines and AC electric railway. The research and evaluation lags far behind DC stray current at home and abroad, besides, the AC current density measuring procedures are complex. Through experimental study of different parameters on the impact of the AC current density established a mathematical model of damaged area, soil resistivity, pipe-to-soil potential and coating resistivity. With it can indirectly get the AC current density, which improve efficiency by simplifying the measuring procedures. Also, provide a basis for harmfulness evaluation of AC stray current by studying the impact of AC current density on the corrosion rate.

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Section: Ac Stray Current Corrosion Testmentioning

confidence: 99%

Study on AC Stray Current Corrosion Law of Buried Steel Pipelines

Wang

Yang

Huang

et al. 2012

AMM

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“…In some alloys two or more phases are desired in order that certain physical or other properties will be obtained. If the various phases can be identified by chemical, spectrographic, or x-ray means, the solution potentials of massive pieces of these phases can be measured in the solu- (10) differential concentration or composition of the corroding solution, (11) differential aeration, (12) differential heating, (13) differential illumination, ( 14) differential agitation, (15) contact with dissimilar metals, (16) externally applied potentials, and (17) complex cells. In cases encountered in practice, 4, 6, 10, and 11 appear to determine the local sites of attack more frequently than do any of the others.…”

Section: Potential Differences Associated With the Metalmentioning

confidence: 99%

“…The discussion has been confined to the effects of direct currents. However, alternating currents can also cause electrolytic attack, at least in certain cases (15,16,20,SO). In the case of alternating currents the frequency is important.…”

Section: Differentialmentioning

confidence: 99%

Causes of Corrosion Currents

Mears¹,

Brown²

1941

Ind. Eng. Chem.

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Localized attack of metal specimens is often the result of electrochemical corrosion, not of simple chemical solution. The appearance of specimens suffering this type of attack has led laymen to attribute it to the presence of impurities in the corroding metal.However, impurities are only one possible cause for this type of attack.Other known or possible causes are: (1) grain boundaries, (2) orientation of grains,(3) differential grain size, (4) differential thermal treatment, (5) surface roughness, (6) local scratches or abrasions, (7) difference in shape, (8) differential strain, (9) differential pre-exposure to air or oxygen, IN MANY neutral solutions the corrosion of the common structural metals appears to be associated with the flow of electric currents between various parts of the metal surface at finite distances from one another. This statement is supported by much qualitative evidence, and in the case of steel ( 14) and of aluminum (7) the quantities of current flowing during corrosion account for the amount of corrosion which occurs.

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“…Gaining the knowledge about AC corrosion has been a slow process. Early studies indicate that AC corrosion rate of steel is relatively low, being in the range of 0.1–2% of a similar amount of direct current . Hence, for many years, corrosion experts did not consider that corrosion on pipelines that attributed to AC was very important.…”

Section: Introductionmentioning

confidence: 99%

Study on location of reference electrode for measurement of induced alternating current voltage on pipeline

Tang

et al. 2013

Int. Trans. Electr. Energ. Syst.

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Summary Alternating current (AC) interference on pipelines derived from adjacent overhead AC power transmission systems can lead to severe AC corrosion, which will result in the perforation and leakage of buried pipelines and thus has attracted more and more attention to extensive research. Induced AC voltage is one of the important factors for AC corrosion risk assessment, and it has been generally accepted that the induced AC voltage of pipelines to remote earth is the driving force for AC corrosion. However, during the field measurement of induced AC voltage, it is not quite a simple task to determine the ‘true’ position of remote earth for diversified testing conditions. In this work, the effects of multiple contributing factors on the electric field distribution of AC interference are investigated, which include unbalanced current, soil resistivity, coating resistivity, pipeline‐to‐power line distance, and the length of mitigation wire. Furthermore, logically suitable locations for ‘remote earth’ in different scenarios have been suggested with the help of numerical simulation, which can be referenced to improve the measuring accuracy of induced AC voltage. Copyright © 2013 John Wiley & Sons, Ltd.

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Alternating-Current Electrolysis

Cited by 11 publications

References 0 publications

Study on AC Stray Current Corrosion Law of Buried Steel Pipelines

Study on AC Stray Current Corrosion Law of Buried Steel Pipelines

Causes of Corrosion Currents

Study on location of reference electrode for measurement of induced alternating current voltage on pipeline

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