AC corrosion

Goidanich, Sara; Lazzari, Luciano; Ormellese, Marco

doi:10.1016/j.corsci.2009.10.005

Cited by 90 publications

(73 citation statements)

References 8 publications

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“…Redox reactions between Fe 2+ and Fe 3+ in the iron oxide films take place during the positive and negative half wave and lead to the formation and reductive dissolution of protective passive films and non-protective rust films 11 . Goidanich et al 7 confirmed that AC leads to the growth of thick but non-adherent films of corrosion products on the metal surface and that, in this way, AC enhances localized corrosion. The authors found that nature, thickness and adhesion of the film changes with AC density, type of metal and solution composition.…”

Section: Introductionmentioning

confidence: 73%

“…The results, however, depend on the electrode material, the electrolyte and the height of the AC signal. Even a decrease of i corr under AC influence was found in one case 7 . Laboratory tests in simulated soil medium showed that the current efficiency with respect to weight loss is much lower in the case of AC than in the case of DC.…”

Section: Introductionmentioning

confidence: 98%

“…In most cases, a shift of E corr to more negative values and a higher i corr are reported [7][8] . The results, however, depend on the electrode material, the electrolyte and the height of the AC signal.…”

Section: Introductionmentioning

confidence: 99%

“…According to Goidanich et al 7 , AC signals have influence on the kinetic parameters of anodic and cathodic reactions and lead to modification of corrosion potential (E corr ) and corrosion current density (i corr ) values. In most cases, a shift of E corr to more negative values and a higher i corr are reported [7][8] .…”

Section: Introductionmentioning

confidence: 99%

“…Laboratory tests in simulated soil medium showed that the current efficiency with respect to weight loss is much lower in the case of AC than in the case of DC. 7 According to the literature the current efficiency is below 5% and depends on the amplitude of the AC signal 9 . Nevertheless, some authors attributed corrosion rates as high as 1mm/y to AC-corrosion during the first year of exposure 5 , probably diminishing during further exposure.…”

Section: Introductionmentioning

confidence: 99%

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Soil corrosion of the AISI1020 steel buried near electrical power transmission line towers

et al. 2014

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Soil corrosion of carbon steel samples buried up to hundred days close to a high voltage power transmission line tower was examined by weight loss vs. time. A higher weight loss was observed if the samples were electrically connected to the tower than if they were not. This was attributed to the influence of alternating current (AC) signals induced in the soil by the transmission line. This field study showed for the first time the influence of the AC power line on the buried structure of the tower, while other studies so far were focused only on AC corrosion of cathodically protected coated pipelines, running parallel to the transmission line. An improved method was used to measure weight loss by descaling in Clark solution. The new method substitutes discontinuous measurements, proposed in the ASTM-G1-90 standard, by in situ measurements of the weight loss during descaling, using a computer controlled microbalance.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil corrosion of the AISI1020 steel buried near electrical power transmission line towers

et al. 2014

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Nielsen

2015

Oil and Gas Pipelines

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Study of criterion for assuring the effectiveness of cathodic protection of buried steel pipelines being interfered with alternative current

Jiang

Qiu

et al. 2011

Materials & Corrosion

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Interference of alternative current (AC) on corrosion of X65 steel was investigated in soil. It was observed that the unfavorable effect of interfering AC was able to be effectively inhibited by increasing the direct current density of the cathodic protection (CP) system. A clear correlation was established between the CP current density and the tolerable AC current density. This led to a new criterion for assuring the effectiveness of CP of buried pipelines being interfered with AC. Field experimental results on a buried pipeline running below a 500 kV transmission line showed that the criterion could satisfactorily predict the risk of AC interfering on the CP system.

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AC corrosion – Part 1: Effects on overpotentials of anodic and cathodic processes

Cited by 90 publications

References 8 publications

Soil corrosion of the AISI1020 steel buried near electrical power transmission line towers

Soil corrosion of the AISI1020 steel buried near electrical power transmission line towers

AC Corrosion

Study of criterion for assuring the effectiveness of cathodic protection of buried steel pipelines being interfered with alternative current

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