Effect of calcareous deposits on hydrogen permeation in X80 steel under cathodic protection

Zhang, Lei; Shen, H.P.; Sun, Jun-yan; Sun, Yanni; Fang, Yichen; Cao, Wenhai; Xing, Yanfei; Lu, Minxu

doi:10.1016/j.matchemphys.2017.12.015

Cited by 26 publications

(6 citation statements)

References 28 publications

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“…Thus, a CaCO 3 layer was deposited on the metal surface. These processes can be described by the following reactions [21][22][23][24][25]: These calcareous deposits decreased the O 2 diffusion to the metal surface as a physical and electrical coating layer, and hindered the oxygen reduction reaction [23,26]. Therefore, the current density was decreased because of the formation of calcareous deposits on the metal surface, as shown in Figure 2.…”

Section: Formation Of Calcareous Depositsmentioning

confidence: 99%

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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: Formation Of Calcareous Depositsmentioning

confidence: 99%

“…The cathodic sites of pipelines, where the inflow current is introduced, have the same conditions when cathodically protected. Therefore, the supply of Ca and Mg can generate a calcareous deposit in a soil environment [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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

2021

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“…As observed, the porosity of the calcareous deposit decreases with the increase in T, whereas it increases with the increase in P and DO. The function of the porosity to the environment parameters is described as in Equation (13). Similarly, T is the most significant factor followed by P and DO, and the interaction of T/P (T × P), T/DO (T × DO), and DO/T (DO × T) also appeared.…”

Section: Effect Of the Environmental Factors On The Calcareous Depositmentioning

confidence: 99%

“…Barchiche et al showed that the increase of temperature could promote CaCO 3 and Mg(OH) 2 formation simultaneously, forming much thicker calcareous deposits. [ 13 ] Xiong et al found that the pressure has little effect on the deposition of much denser CaCO 3 , displayed a loose layer on the metal surface, then the protection of calcareous deposits could be neglected. [ 14 ] Conversely, oxygen promoted the deposition of CaCO 3 and exhibited a much more compacter film.…”

Section: Introductionmentioning

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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“…With the development of marine engineering, cathodic protection, an efficient method of corrosion control, has been widely applied to marine structures, such as offshore platforms, subsea pipelines, as well as bridges and tunnels [17][18][19]. Calcareous deposits, as interesting secondary products in the cathodic protection process, have attracted widespread attentions in recent years because of their important roles in cathodic protection [20][21][22]. Lee [23] and Rossi [24] found that the calcareous deposits cover the structure surface and inhibit oxygen reduction, consequently decreasing the corrosion rate and improving the protective efficiency.…”

Section: Introductionmentioning

confidence: 99%

The Interaction of Biofoulants and Calcareous Deposits on Corrosion Performance of Q235 in Seawater

et al. 2020

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An understanding of the interaction of calcareous deposits and biofoulants on the corrosion performance of steel during the fouling stage is both interesting and necessary. So, the effects of these factors on Q235 carbon steel were investigated and discussed for 20 weeks under real ocean conditions. The results indicate that calcareous deposits are favorable for the attachment of marine microorganisms. However, macroorganisms prefer adhering directly to the substrate. The generations of calcareous deposits have priority over the biofilm attachment under the condition of cathodic protection. Calcareous deposits can prevent steel against corrosion for four weeks without cathodic protection.

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Effect of calcareous deposits on hydrogen permeation in X80 steel under cathodic protection

Cited by 26 publications

References 28 publications

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

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

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

The Interaction of Biofoulants and Calcareous Deposits on Corrosion Performance of Q235 in Seawater

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