Influence of a simulated deep sea condition on the cathodic protection and electric field of an underwater vehicle

Kim, Y.-S.; Lee, S.K.; Chung, Hyun-Ju; Kim, J.-G.

doi:10.1016/j.oceaneng.2017.11.027

Cited by 30 publications

(11 citation statements)

References 16 publications

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“…The working electrode was encapsulated by epoxy resin, and the sample is a cylinder with a diameter of 1.1 cm and a height of 1 cm, so the exposed area of metal is 1.0 cm 2 . Before the tests, the specimens were abraded with wet SiC paper (initially 220, 600 and 1000 grades), rinsed with acetone and ethanol, and finally dried with pure nitrogen gas [6] covered with coating; therefore, the curve obtained by multiplying current density in polarization curve of 921A by coating breakdown factor (2%) is set as the boundary condition of hull immersion zone, while the propeller is exposed to seawater, so the polarization curve of B10 is set as the boundary condition of propeller directly, and the compensation anode is set as constant current boundary.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

“…With the continuous development of underwater electric field detection technology, corrosion electric field has become the signal source of new mine warfare weapon attack on ships [3]. The effects of conductivity, flow rate, depth of seawater, and other marine environmental factors on the distribution of corrosion electric field were studied [4][5][6]. Furthermore, the corrosion electric field of ship was simulated by equivalent electric dipole, and the electromagnetic field generated by horizontal and vertical electric dipoles in stratified media was analyzed [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Compensation Current to Minimize Underwater Electric Field of Ship

Xu¹,

Wang²,

Xu³

et al. 2020

PIER M

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In order to reduce the underwater electric field generated by corrosion of ship, a boundary element method (BEM) combined with nonlinear polarization curve was employed to investigate the influence of output current of compensate anode in an electric field protection system on underwater electric field. Moreover, the BEM model was verified by physical scale modeling (PSM). The distribution characteristic of electric field and the variation trend of electric field with compensate current obtained by simulation are consistent with the experimental results. Moreover, the errors of peak-to-peak value of electric field obtained by experiment and simulation are within 20%. Compared with 0 mA compensation current, the peak-to-peak values of X component, Y component, Z component, and modulus are reduced by 52%, 70%, 72%, and 62% respectively when compensation current is 40 mA. The phenomenon of over-compensation will occur if compensation current is greater than 40 mA.

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Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing Compensation Current to Minimize Underwater Electric Field of Ship

Xu¹,

Wang²,

Xu³

et al. 2020

PIER M

View full text Add to dashboard Cite

show abstract

“…The working electrode was encapsulated by epoxy resin, and the size of sample is ϕ 1.1 cm × 1 cm, so the exposed area of metal is 1.0 cm 2 . Before the tests, the specimens were abraded with wet SiC paper (initially 220, 600 and 1000 grades), rinsed with acetone and ethanol and finally dried with pure nitrogen gas [11]. The changes of polarization curves of carbon steel and copper alloy under different seawater conductivity are very small, and the self-corrosion potential is about −0.7 V and −0.2 V, respectively.…”

Section: Potentiodynamic Polarization Testmentioning

confidence: 99%

“…The equilibrium potential of coated carbon steel in seawater is about −0.8 V, and the current density at different potentials is much smaller than the polarization current density of carbon steel and copper alloy. Therefore, the surface of well-coated ship is considered an insulation boundary condition in some literatures [11,15]. Fig.…”

Section: Potentiodynamic Polarization Testmentioning

confidence: 99%

“…The equivalent electric dipole model of corrosion electric field of ship was established, and the electromagnetic field generated by horizontal and vertical electric dipoles in multilayer medium was analyzed [7,8]. Furthermore, the effect of environmental factors such as seabed conductivity or seawater conductivity, depth and temperature on underwater electric field was studied [9][10][11]. The boundary element method is a method based on the weighted residual method, which converts the boundary value problem into a boundary integral equation problem and then uses the finite element discrete technique to construct linear equations [12].…”

Section: Introductionmentioning

confidence: 99%

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Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

Wang¹,

Xu²,

Zhang³

2018

PIER M

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Seawater conductivity is an important factor that affects the corrosion electric field of ship. A three-dimensional boundary element method (3D-BEM) combined with nonlinear polarization curve was employed to investigate the influence of seawater conductivity on the corrosion electrostatic field. Numerical simulation results show that the electric field distribution is only slightly influenced by the conductivity. However, the intensity decreases with the increases of conductivity. The simulation results of the BEM model were compared with the results of the equivalent electric dipole model, and the results obtained by the two methods had high similarity, which demonstrated that the BEM model was effective. The former is a more convenient and concise modeling method that can better reflect the distribution characteristics of ship's corrosion electric field than the electric dipole model.

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The effect of cathodic polarization on the corrosion behavior of X65 steel in seawater containing sulfate‐reducing bacteria

2020

Materials & Corrosion

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Sulfate-reducing bacteria (SRB) are one of the main reasons for the accelerated corrosion of steel. Cathodic polarization has been reported as an effective and economic method against marine corrosion, including microbiologically induced corrosion. However, the interaction between cathodic polarization and microbial activity has not been well defined. In this study, a fluorine-doped tin oxide electrode is used to study the effect of cathodic current on SRB cells. Fluorescence microscopy results clearly show that the attachment degree of SRB is dependent on the electric quantity and current intensity. The large electric quantity and high cathodic current (400 mA/m 2 × 30 h) can effectively inhibit bacterial attachment and subsequent biofilm formation. Furthermore, the effect of cathodic potential on the corrosion behavior of X65 steel in the presence of SRB is systematically investigated. Results show that the impressed charges, the increase of pH, and the formation of calcareous deposits on the electrode surface at the cathodic potential of −1,050 mV/SCE inhibit the attachment of SRB. In turn, the presence of SRB also interferes with the electrochemical reactions that occur during the polarization process, thus increasing the cathodic current. The interaction between SRB-induced corrosion and the process of preventing corrosion by various cathodic potentials is discussed.

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Influence of a simulated deep sea condition on the cathodic protection and electric field of an underwater vehicle

Cited by 30 publications

References 16 publications

Optimizing Compensation Current to Minimize Underwater Electric Field of Ship

Optimizing Compensation Current to Minimize Underwater Electric Field of Ship

Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

The effect of cathodic polarization on the corrosion behavior of X65 steel in seawater containing sulfate‐reducing bacteria

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