Electric charge flow in linear circuits

Silva, Jose Claudio de Oliveira e; Panicali, Antonio Roberto; Barbosa, Célio Fonseca; Caetano, C.E.F.; Paulino, José Osvaldo Saldanha

doi:10.1016/j.epsr.2019.01.014

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Figure 9 shows the total electric charge at the current inflow area when 3.5 V SCE was applied for 100 h, along with the mass loss of the specimen at the current outflow area. The total electrical charge value was obtained using the following equation [14,36]: Since the calcareous deposits decreased the inflow current, the total electric charge values of all specimens with a calcareous deposit were lower than that of the bare specimen. During the corrosion acceleration tests, a crack occurred in the unstable Mg(OH) 2 layer.…”

Section: Corrosion Acceleration Testmentioning

confidence: 99%

Method for Mitigating Stray Current Corrosion in Buried Pipelines Using Calcareous Deposits

2021

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Stray current corrosion in buried pipelines can cause serious material damage in a short period of time. However, the available methods for mitigating stray current corrosion are still insufficient. In this study, as a countermeasure against stray current corrosion, calcareous depositions were applied to reduce the total amount of current flowing into pipelines and to prevent corrosion. This study examined the reduction of stray current corrosion via the formation of calcareous deposit layers, composed of Ca, Mg, and mixed Ca and Mg, at the current inflow area. To verify the deposited layers, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were performed. The electrochemical tests revealed that all three types of calcareous deposits were able to effectively act as current barriers, and that they decreased the inflow current at the cathodic site. Among the deposits, the CaCO3 layer mitigated the stray current most effectively, as it was not affected by Mg(OH)2, which interferes with the growth of CaCO3. The calcium-based layer was very thick and dense, and it effectively blocked the inflowing stray current, compared with the other layers.

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Section: Corrosion Acceleration Testmentioning

confidence: 99%