The Effect of Temperature and Dissolved Oxygen Concentration on the Electrochemical Behavior of Al-Zn-Inbased Anodes

Li, Weili; Yan, Yong; Chen, Guang; Ma, Li

doi:10.1016/j.proeng.2011.05.006

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…Aluminum (Al) alloy sacrificial anodes have been widely used to protect marine structures due to their high current efficiency, low specific weight, and low cost. [1][2][3][4][5] They usually work in the seawater at different depths [6][7][8][9][10] or sea mud, [11][12][13] displaying different electrochemical performances due to different media features, such as temperature, [14][15][16] hydrostatic pressure, [6][7][8][9][10] dissolved O 2 (DO) content, [14] pH, [17] and sulfate-reducing bacteria (SRB). [13,18,19] Nowadays, steel shell-concrete composite structure has been adopted for subsea immersed tunnels, typically buried in backfilled stone layers up to several meters thick and hundreds of kilograms per unit, as shown in Figure 1a.…”

Section: Introductionmentioning

confidence: 99%

Effect of backfilled stone/brine media on the initial electrochemical performance of aluminum sacrificial anode

Zhao¹,

Wang

Qingfei

et al. 2022

Materials & Corrosion

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Aluminum alloy sacrificial anodes applied to protect the subsea immersed tunnels' steel shells are buried in an unfamiliar inhomogeneous backfilled stone/brine media. To verify its influence, the effect of the backfilled stone (10–12, 6–10, and 3–6 mm)/brine (40 Ω cm) media, denoted as Stone 1, Stone 2, and Stone 3, on the initial electrochemical performance of an Al─Zn─In─Si─Sn─Ti anode is investigated by electrochemical and surface analysis techniques. With decreasing the stone size, the Stones 1–3 media's resistivity increases to 100, 125, and 150 Ω cm, respectively. The backfilled stone/brine media inhibits the anode′s free corrosion and pitting process and accelerates its activation in the initial period. The anode′s capacity and current efficiency decrease slightly; however, the anode′s output current and its transmission are depressed more heavily by decreasing the backfilled stone size. Also, the backfilled stone shields parts of the cathode surfaces, decreases dissolved oxygen concentration, and blocks the diffusion of the anode's dissolution product in the media, resulting in the change of the anode's protective effect.

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Section: Introductionmentioning

confidence: 99%

Effect of backfilled stone/brine media on the initial electrochemical performance of aluminum sacrificial anode

Zhao¹,

Wang

Qingfei

et al. 2022

Materials & Corrosion

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“…The large affinity between Cd and Zn promotes the uniform distribution of Zn in the aluminum matrix and reduces the segregation of Zn and In. Moreover, Cd and In can increase the lattice parameters, which makes the oxide film loose and reduces the bluntness of aluminum in a neutral solution . Al–Zn–In–Si alloy with uniform corrosion dissolution morphology (Figure d) has the actual capacity of 2,437.3 Ah/kg and the current efficiency of 85.5%.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, Cd and In can increase the lattice parameters, which makes the oxide film loose and reduces the bluntness of aluminum in a neutral solution. [35] Al-Zn-In-Si alloy with uniform corrosion dissolution morphology (Figure 4d) has the actual capacity of 2,437.3 Ah/kg and the current efficiency of 85.5%. Large latent heat of fusion of Si improves the fluidity of the alloy during solidification and reduces the segregation of elements, which enhances the diffusion of active elements and promotes uniform distribution of active elements in the aluminum matrix.…”

Section: Constant Current Discharge Testmentioning

confidence: 99%

Influence of Sn, Cd, and Si addition on the electrochemical performance of Al–Zn–In sacrificial anodes

Xia

Zhang

Yang

et al. 2019

Materials & Corrosion

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Overcoming the reduction of current efficiency and stacking of corrosion products on the surface of Al–Zn–In sacrificial anodes after long‐term use is of great significance for Al–Zn–In alloy as an anode material for cathodic protection of steel structures in seawater. In this study, four different sacrificial anode materials were prepared based on the Al‐6Zn‐0.03In (wt%) alloy without and with the addition of alloying elements of Sn, Cd, and Si, respectively. The influence of the addition of Sn, Cd, and Si on the microstructure and electrochemical performance of the Al–Zn–In anode was investigated by optical microscopy and electrochemical measurements. The results show that the introduction of Sn, Cd, and Si changes the microdendrite structure of Al–Zn–In to equiaxed grain. The added Sn, Cd, and Si alloys have more negative and stable working potential and uniformly dissolved morphology. The actual capacity and current efficiency of aluminum alloys increase from 2,000.6 Ah/kg and 70.7% of Al–Zn–In alloy to 2,539.4 Ah/kg and 88.6% of Al–Zn–In–Sn, 2,437.3 Ah/kg and 85.5% of Al–Zn–In–Cd and 2,500.4 Ah/kg and 88.8% of Al–Zn–In–Si alloys, respectively.

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“…It is important to note that while preparing the dataset, we manually surveyed the literature pertinent to the current efficiency measurement of aluminium sacrificial anodes in different chemical compositions [1][2][3][4][5][6][7][8][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. We carefully checked the current efficiency, chemical composition, and other environmental factors in each paper, including pH, dissolved oxygen (DO), temperature, and pressure.…”

Section: Dataset Collectionmentioning

confidence: 99%

Artificial neural network modelling to predict the efficiency of aluminium sacrificial anode

Rezaei

2023

Corrosion Engineering, Science and Technology: The Internationa

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Study explores the potential of a deep learning-based approach for predicting the current efficiency of aluminium sacrificial anodes in marine environments. The model takes into account various input variables, including the chemical composition of the sacrificial anode, pH, dissolved oxygen (DO), temperature, pressure, cathode electrode, current density, and the ratio of the surface area of the cathode to anode, with the anode current efficiency serving as the output variable. Utilising artificial neural networks in this study shows a mean absolute percentage error of 6.4% and 7.8% for the training and validation for predicting the current efficiency. The proposed model shows promising potential to predict the current efficiency of aluminium sacrificial anodes and improve the design of cathodic protection systems based on aluminium sacrificial anodes.

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The Effect of Temperature and Dissolved Oxygen Concentration on the Electrochemical Behavior of Al-Zn-Inbased Anodes

Cited by 14 publications

References 9 publications

Effect of backfilled stone/brine media on the initial electrochemical performance of aluminum sacrificial anode

Effect of backfilled stone/brine media on the initial electrochemical performance of aluminum sacrificial anode

Influence of Sn, Cd, and Si addition on the electrochemical performance of Al–Zn–In sacrificial anodes

Artificial neural network modelling to predict the efficiency of aluminium sacrificial anode

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