Laboratory and Field Characterization of a New Sacrificial Anode for Cathodic Protection of Offshore Structures

Rossi, Stefano; Bonora, P.L.; Pasinetti, R.; Benedetti, L.; Draghetti, M.; Sacco, Enrico

doi:10.5006/1.3284815

Cited by 22 publications

(6 citation statements)

References 1 publication

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“…As these nonconductive deposits progressively cover the surface, the flux of dissolved oxygen from seawater toward the steel surface is limited. In addition, the overall rate of the cathodic protection reaction (4) decreases, leading to a reduction in the cathodic current density required and the consumption of the sacrificial anode [28][29][30][31][32]. But, however, according to Corrosionpedia [33], a calcareous deposit is a layer that consists of calcium carbonate and other salts deposited on the substrate's surface.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Inhibition of Mild Steel Corrosion in Seawater and Acidic Medium by Cathodic Protection and Monodora myristica Using Zinc Anode

Ukpong

Bamgboye

Soriyan

2018

International Journal of Corrosion

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The synergistic inhibition of mild steel corrosion in seawater and 0.1M sulphuric acid by the cathodic protection and Monodora myristica was carried out through the weight loss and the linear polarization resistance (LPR) measurement. The results showed that in seawater, the synergism was not too effective for the protection of steel, whereas in 0.1M sulphuric acid, there was a great synergism between cathodic protection and the oil extracts of Monodora myristica, having an efficiency (IE%) of 102.89% at 15 mL of the oil extracts. For the linear polarization resistance (LPR), in most of the cases, there was a slight shift of the corrosion potential (Ecorr) and the open circuit potential (OPC) toward the positive as the volume of the oil extracts increased, thereby causing a change in the cathodic and the anodic Tafel slopes, which showed that the inhibitor is a mixed- type inhibitor. The corrosion current density (icorr) decreases as the volumes of the oil extract increase. Langmuir adsorption isotherm fitted best with an R2 of 1 unit, indicating a good agreement with the experimental data and with Langmuir adsorption isotherm.

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Section: Resultsmentioning

confidence: 99%

Synergistic Inhibition of Mild Steel Corrosion in Seawater and Acidic Medium by Cathodic Protection and Monodora myristica Using Zinc Anode

Ukpong

Bamgboye

Soriyan

2018

International Journal of Corrosion

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“…Moreover, these reactions lead to changes in the inorganic carbonic equilibrium at the metallic interface, favor carbonate ion over hydrogen carbonate and allow calcium carbonate precipitation. Scale deposition on the metallic surface, the so-called calcareous deposits, acts as a physical barrier against oxygen diffusion and thus decreases the required current density to keep efficient protection [2,3]. Furthermore, it has been shown that the pulse CP system requires at least 10% less current than conventional CP for the same level of surface potential because, first, the current has uniform distribution over the structure and, second, perfect calcareous deposits are formed at shorter times and lower potentials.…”

Section: Introductionmentioning

confidence: 99%

Application of Taguchi method for the characterization of calcareous deposits formed by pulse cathodic protection

Zamanzade

Shahrabi

Gharacheh

2007

Materials & Corrosion

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In this study, the Taguchi method, a powerful tool to design optimization for quality, is used to find the optimal process parameters of pulse cathodic protection system for the calcareous deposits' formation. An orthogonal array, main effect and the signal-to-noise (S/N) ratio are employed to investigate the process parameters in order to achieve optimum final current density. Through this study also the main process parameters that affect the calcareous deposits' formation can be found. Experiments were carried out to confirm the effectiveness of this approach. From the results, chronoamperometric measurements have been used to evaluate the influence of pulse cathodic protection on decreasing the required cathodic current for protection and also decreasing the surface coverage. The morphology of the formed deposits has been evaluated through scanning electron microscopy (SEM) and chemical analysis of the formed deposits has been performed using X-ray diffraction (XRD). It is found that the different environmental conditions, i.e., Ca 2þ concentration, Mg 2þ concentration, rotation speed, and temperature significantly affect the final required current density of the pulse cathodic protection. The optimum levels of parameters at different frequencies are also presented.

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“…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. This phenomenon is important in improving protection economics.…”

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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Laboratory and Field Characterization of a New Sacrificial Anode for Cathodic Protection of Offshore Structures

Cited by 22 publications

References 1 publication

Synergistic Inhibition of Mild Steel Corrosion in Seawater and Acidic Medium by Cathodic Protection and Monodora myristica Using Zinc Anode

Synergistic Inhibition of Mild Steel Corrosion in Seawater and Acidic Medium by Cathodic Protection and Monodora myristica Using Zinc Anode

Application of Taguchi method for the characterization of calcareous deposits formed by pulse cathodic protection

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

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