Galvanic corrosion behavior of deposit-covered and uncovered carbon steel

Zhang, G.A.; Yu, Neng; Yang, Le; Guo, Xingpeng

doi:10.1016/j.corsci.2014.05.011

Cited by 93 publications

(44 citation statements)

References 28 publications

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“…In Figure 9a,b, the corrosion was accelerated at the boundary of the α-FeOOH and Fe3O4-covered specimens, which was caused by more negative corrosion potential than the bare specimen, i.e., a galvanic effect. Alternatively, the boundary between the Fe2O3-covered and uncovered did not show accelerating corrosion behavior as shown in Figure 9c, which could be due to the absence of the corrosion potential difference [17,[32][33][34]. In the cross-sectional view of the α-FeOOH and Fe3O4-covered specimens in Figure 10, obvious corrosion acceleration was observed.…”

Section: Potentiostatic Testsmentioning

confidence: 92%

Corrosion Behavior of Pipeline Carbon Steel under Different Iron Oxide Deposits in the District Heating System

Kim

2017

Metals

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Abstract:The corrosion behavior of pipeline steel covered by iron oxides (α-FeOOH; Fe 3 O 4 and Fe 2 O 3 ) was investigated in simulated district heating water. In potentiodynamic polarization tests; the corrosion rate of pipeline steel is increased under the iron oxide but the increaseing rate is different due to the differnet chemical reactions of the covered iron oxides. Pitting corrosion was only observed on the α-FeOOH-covered specimen; which is caused by the crevice corrosion under the α-FeOOH. From Mott-Schottky and X-ray diffraction results; the surface reaction and oxide layer were dependent on the kind of iron oxides. The iron oxides deposit increases the failure risk of the pipeline and localized corrosion can be occurred under the α-FeOOH-covered region of the pipeline. Thus, prevention methods for the iron oxide deposit in the district pipeline system such as filtering or periodic chemical cleaning are needed.

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Section: Potentiostatic Testsmentioning

confidence: 92%

Corrosion Behavior of Pipeline Carbon Steel under Different Iron Oxide Deposits in the District Heating System

Kim

2017

Metals

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“…The BP and HP aqueous solutions were used as the film-forming solutions in which BP or HP could spontaneously adsorb onto the iron substrate and form self-assembled thin films. The polished iron electrodes and small iron plates (0.5 cm × 1.0 cm) were immersed in the BP or HP aqueous solutions for 10 6 solution for 1 h to attain stable open circuit potential (OCP) and the changes were recorded as a function of exposure time. 34 The polarization curves were measured with a CHI 604C electrochemical workstation by scanning the potential with 0.2 mV s -1 going from the cathodic to the anodic side.…”

Section: Figmentioning

confidence: 99%

Spontaneous formation of mono-n-butyl phosphate and mono-n-hexyl phosphate thin films on the iron surface in aqueous solution and their corrosion protection property

Zhao

Gao

et al. 2015

RSC Adv.

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Mono-n-butyl phosphate (BP) and mono-n-hexyl phosphate (HP) thin films were directly formed on the iron surface by immersing pure iron samples in aqueous solutions containing BP or HP. FTIR analyses, XPS characterizations and water contact angle data show that the iron surfaces were covered with the BP or HP thin films. The spontaneous formation of alkyl phosphate thin films on the iron surface is largely attributed to the electrostatic interaction between Fe 2+ ions on the surface of iron and RO-PO 3 H -(R represents n-butyl or n-hexyl ) ions and the specific adsorption of phosphate group on the iron substrate. Moreover, electrochemical results clearly demonstrate that the as-formed thin films can effectively protect the iron substrate from corrosion in NaCl corrosive solutions.

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“…The mineral deposit, biofilm, rust layer, and carbonate deposit may accumulate at the bottom of the pipe when the flow velocity is low . The inhomogeneous distribution of the pH, aggressive ions, and dissolved oxygen concentration beneath the deposits will lead to serious localized corrosion . Localized corrosion is the most destructive form of corrosion and it is a hard issue in the corrosion engineering .…”

Section: Introductionmentioning

confidence: 99%

“…It is thought that the inhibitor may intensify the inhomogeneous distribution of the anodic and cathodic areas under the deposit and cause a high localized anodic dissolution rate . In the studies conducted by Tan et al and Zhang et al , it is found that the potential difference between the deposit‐covered area and bare steel area may also lead to the occurrence of UDC. In pipeline conditions, the deposit‐covered area is always much smaller than the area without deposit.…”

Section: Introductionmentioning

confidence: 99%

“…The current and potential distributions can be well measured by the sensor system. Therefore, it has been used as an effective method for the study of UDC in various tests . Although the spacial and temporal development of the localized corrosion can be revealed by the sensor system, the monitoring of the localized corrosion rate is also hard to be realized .…”

Section: Introductionmentioning

confidence: 99%

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The study of the localized corrosion caused by mineral deposit using novel designed multi‐electrode sensor system

Zhu

Liu

et al. 2016

Materials & Corrosion

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In this paper, a new kind of multi‐electrode sensor system was developed for the study of the localized corrosion of the X65 pipeline steel caused by mineral deposit in oxygen containing solution. The electronic resistance (ER) method and zero resistance ammeter (ZRA) technique were simultaneously used for the monitoring of the corrosion depths and galvanic currents. The new sensor system showed a wider application range in the monitoring of the corrosion depth compared with traditional electrochemical methods. It also presented high measurement accuracy in the corrosion depth measurement. The test results revealed that the mineral deposit and heterogeneous distribution of the rust layer on the steel surface will cause inhomogeneous corrosion process. The deposit‐covered area will always act as anode and serious localized corrosion will occur beneath the sand particles. The ER method is not an in situ monitoring technique. The excitation current used in ER measurement will lead to a charging and discharging process of the double electrolyte layer on the steel surface.

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Galvanic corrosion behavior of deposit-covered and uncovered carbon steel

Cited by 93 publications

References 28 publications

Corrosion Behavior of Pipeline Carbon Steel under Different Iron Oxide Deposits in the District Heating System

Corrosion Behavior of Pipeline Carbon Steel under Different Iron Oxide Deposits in the District Heating System

Spontaneous formation of mono-n-butyl phosphate and mono-n-hexyl phosphate thin films on the iron surface in aqueous solution and their corrosion protection property

The study of the localized corrosion caused by mineral deposit using novel designed multi‐electrode sensor system

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