Application of Electrochemical Impedance Spectroscopy to evaluate cathodically protected coated steel in seawater

Narozny, M.; Żakowski, Krzysztof; Darowicki, Kazimierz

doi:10.1016/j.conbuildmat.2018.06.033

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…However, the marine environment is harsh and complex, and a single protection method can no longer meet the corrosion protection needs of marine equipment. The combined application of organic coatings and cathodic protection (CP) technology is currently the most economical and effective method to control the corrosion of metal structures such as bridges, ships and pipelines [3][4][5]. In the earlier stages of the double-protection system, the isolation function of organic coatings plays a key role as the corrosive solution has not permeated through the coating and the drop of the potential mainly occurs due to the higher coating resistance.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Alkyd-Resin-Coated Carbon Steel under Cathodic Polarization in Both Static and Flowing Seawater

Guo

Zhou²,

Feng

et al. 2023

Coatings

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The effect of cathodic polarization on the corrosion behavior of alkyd-resin-coated carbon steel with an artificial coating defect was researched using a wire beam electrode (WBE) and electrochemical impedance spectroscopy (EIS) in both static and flowing simulated solutions. The microscopic morphology and chemical structure of the organic coating were characterized by scanning electron microscopy (SEM) and infrared spectroscopy (FT-IR) to reveal the degradation mechanisms of organic coatings under different polarization potentials. The study found that the failure process of the alkyd coating could be accelerated by cathodic polarization. After 312 h of immersion, the impedance under −1100 mV was one order of magnitude lower than that under the open-circuit potential (OCP). The coating delamination became serious with the negative shifting of polarization potential, and the delamination area ratio under −1100 mV in both static and flowing seawater rose to 23% and 14%, respectively. Interestingly, the flowing condition of the immersion solution that combined with cathodic polarization exhibited a synergistic effect, which could accelerate (in the earlier stage) and then alleviate the delamination of the coating. Furthermore, the results showed that both the diffusion of the corrosion particles and the anodic dissolution reaction of the metal could be significantly affected by cathodic polarization and the flowing condition of the solution, which provides a possible approach to gain insight into the delamination of organic coating.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Alkyd-Resin-Coated Carbon Steel under Cathodic Polarization in Both Static and Flowing Seawater

Guo

Zhou²,

Feng

et al. 2023

Coatings

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“…Does the dual effect lead to any changes in the microstructure and mechanical properties of the material? Although the surface of the pipeline steel is always coated by a protective layer in service [12,13,14,15,16,17], it is still necessary to understand how the material itself changes at high hydrogen concentration. Recently, we found that a spindle-shaped product appeared on the surface when the 2205 DSS was immersed in a 3.5 wt.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Surface Hydrogen Charging Product Affecting the Mechanical Properties in 2205 Duplex Stainless Steel

Kan

Yang

2019

Materials

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When 2205 duplex stainless steel (DSS) is immersed in simulated seawater under high hydrostatic pressure, or in an electrochemically hydrogen charged state, a spindle-shaped product is found in the ferrite phase that seriously deteriorates the mechanical properties of 2205 DSS. This paper systematically studied the composition, structure, and properties of the hydrogen charging product. The results of a slow strain rate tensile test show that the hydrogen charging product evidently reduces the elongation of 2205 DSS, and microcracks mainly initiate at the interface between the hydrogen charging product and the ferrite matrix at either a low or a high strain rate. However, the elongation recovers to that of the hydrogen free sample after heating the sample at 300 °C for 0.5 h. The nano-hardness and reduced modules of the product are higher than those of the ferrite and austenite phases. An element analysis by energy dispersive spectroscopy (EDS) and secondary ion mass spectrometry (SIMS) indicates that the Ni and H contents in the hydrogen charging product are higher than in the normal ferrite area, and X-ray diffraction shows the characteristic peak of iron hydride at 40.07°. Moreover, a differential scanning calorimeter (DSC) test demonstrated that the phase decomposition temperature of the product is 268 °C, which coincides with the fact that it dissolves at a high temperature caused by the focused electron beam during transmission electron microscopy (TEM) analysis. All experimental results indicate that the hydrogen charging product is a hydride of FeH or (Fe, Ni)H.

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“…Response surface methodology (RSM) using statistical methods provides an efficient approach to explore the effect of individual factors and interactions to optimize the system and has been widely used in many engineering fields, such as material engineering, [16] food engineering, [17] and chemical engineering. [18][19][20][21] Goh et al used RSM to evaluate the dosage, pH value, and contact time effects of high-dose phosphate inhibition for copper corrosion control. [22] They found that the interaction between polyphosphate dosage and pH was more significant than that between polyphosphate dosage and contact time, and pH and contact time.…”

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confidence: 99%

Effect of the calcareous deposits on the cathodic protection potential of 10Ni5CrMoV high‐strength steel in a deep‐sea environment by using the response surface methodology

Zhang

et al. 2020

Materials & Corrosion

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The effect of deep-sea environments on the properties of calcareous deposits was studied and we established the mapping relationship between their cathodic protection potential and the temperature (T), pressure (P), dissolved oxygen (DO), and the properties of the calcareous deposits according to the response surface methodology. This revealed that the calcareous deposits mixed with CaCO 3 and Mg(OH) 2 under cathodic protection. The environment including temperature, pressure, and oxygen content had various impacts on the thickness, porosity, and the ratio of Ca and Mg. Moreover, the calcareous deposits slightly decreased the cathodic protection potential. Therefore, it can be believed that the cathodic protection potential for naked high-strength steel is also approximately applicable to that covered with calcareous deposits in the deep-sea environment.

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Application of Electrochemical Impedance Spectroscopy to evaluate cathodically protected coated steel in seawater

Cited by 10 publications

References 20 publications

Corrosion Behavior of Alkyd-Resin-Coated Carbon Steel under Cathodic Polarization in Both Static and Flowing Seawater

Corrosion Behavior of Alkyd-Resin-Coated Carbon Steel under Cathodic Polarization in Both Static and Flowing Seawater

Characterization of a Surface Hydrogen Charging Product Affecting the Mechanical Properties in 2205 Duplex Stainless Steel

Effect of the calcareous deposits on the cathodic protection potential of 10Ni5CrMoV high‐strength steel in a deep‐sea environment by using the response surface methodology

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