Effect of Mg Content on the Performance of Al-Zn-Mg Sacrificial Anodes

Orozco, R.; Genescá, J.; Juárez-Islas, J. A.

doi:10.1007/s11665-007-9037-z

Cited by 35 publications

(17 citation statements)

References 8 publications

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“…The measured E corr values are in the interval between −1269 and −955 mV (SCE) and are similar to the previously obtained by other authors such as Barbucci et al 1, Orozco et al 2, Foley and Trazskoma 11, and Talavera et al 12 working with Al‐alloys of similar chemical composition.…”

Section: Resultssupporting

confidence: 90%

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Influence of turbulent flow on the corrosion of Al‐Zn‐Mg galvanic anode in artificial seawater media

Quevedo¹,

Genescá²

2009

Materials & Corrosion

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The effect of hydrodynamics on the corrosion of Al(14 wt%)-Zn(8 wt%)-Mg alloy in artificial seawater media at room temperature was studied in a rotating cylinder electrode (RCE) system under turbulent flow conditions. Five different rotation rates were studied: 100, 1000, 3000, 5000, and 7000 rpm. The corrosion rates were measured by electrochemical impedance spectroscopy (EIS). For the system studied, the steady-state corrosion potential increased with increase in rotation rate. The effect of increasing the rotation rate is to increase the availability of oxygen at the surface, which in turn will polarize the corrosion reaction in the more noble direction. The corrosion rate also increases with increase in RCE rotation rate. This reflects the fact that the rate of corrosion is controlled, at least in part, by the rate of mass transfer. In this case, the effect of increase in the rotation rate on the corrosion rate is to increase the interfacial concentration of the reactant (oxygen).

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Section: Resultssupporting

confidence: 90%

“…Recently the Al‐Zn‐Mg alloy has been pointed out as a promising alloy system to be studied due to its low electrode potential and high current capacity to be used as galvanic anode 1, 2.…”

Section: Introductionmentioning

confidence: 99%

Influence of turbulent flow on the corrosion of Al‐Zn‐Mg galvanic anode in artificial seawater media

Quevedo¹,

Genescá²

2009

Materials & Corrosion

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“…It is thought, that these phases play an important role in the process of corrosion protection. Furthermore, the alloy in literature [13] was reproduced exactly at the same composition and other conditions, and then was subjected to the same procedure of evaluation that was adopted in this work in order to be used as a reference alloy for comparing the results obtained above. The comparison was also done with the Mg-alloy that has been originally used by the Southern Oil Company in AL-FAO region.…”

Section: Methodsmentioning

confidence: 99%

Cathodic Protection of Oil Pipelines by Aluminum Alloys

Alzwghaibi¹,

Saeed²,

Klif³

2011

JKAU: Eng. Sci.

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In the present work, a series of aluminum alloys have produced as candidate sacrificial anodes materials to use in the protection of oil pipelines that pass through the AL-FAO region area in Southern of Iraq, where the soil is enriched with the chlorides ions. The production of these alloys consists of alloying the pure aluminum with different weight percentages of Zn and Mg. These produced alloys microstructurally and electrochemically characterized to use as cathodic protection anodes of oil pipelines. Generally, all the produced Al-alloys provide well protection for steel pipelines with different efficiencies. They give a lower current density (1.51-12.36 µA/cm²) in comparison with the used Mg-alloy. The produced (Calloy: 5.5 wt%Zn, 10wt%Mg) clearly satisfied the criteria where a uniform weight loss rate accompanied with a noticeable current density. It gives (12.36 µA/cm²) with linear and uniform weight loss. The reason behind such behavior, was attributed to the chemical composition of this alloy that develops a set of phases such as ß(Al 2 Mg)-phase in addition to the τ(Mg 32 (AlZn) 49)-phase that exists in a larger amount this time as compared with τ(Mg 32 (AlZn) 49)-phase which developed in B-alloy (5.5 Zn + 8 Mg)%wt. The higher content of phase above plays an important role in breaking down the protective oxide film that can form on the Al-alloys surface and as a result, increasing its effectiveness as a sacrificial anode by a uniform increasing of dissolution (i.e. corrosion). The produced C-alloy was found superior than the Mg-alloy that is now originally used in cathodic protection of oil pipelines in Southern Iraq.

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“…After the dissolution process of Mg 2 Si/α, the τ-AlMgZn/α phase starts dissolving until it disappears, as seen in Figures 9 and 10. When the eutectic of τ-AlMgZn/α [27] corrodes, only parts with a tube morphology of the α-phase (matrix) are left. This is more obvious in series 2, which has larger sizes and percentages of the phases present (see Tables 3 and 4).…”

Section: Sem Observations After the Corrosion Testsmentioning

confidence: 99%

Effect of Experimental Aging on the Performance of Al-7.9Mg-13.3Zn and Al-10.5Mg-8.6Zn Alloys as Sacrificial Anodes

Hernández

Torres

Serna

et al. 2019

Metals

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Light aluminum alloys have a great importance in industry owing to generally accessible costs, low density, good machinability, and corrosion resistance under certain environments. The present work studies aging treatments that preform important roles on the distribution and microstructural changes of two AlMg-Zn alloys, and the resulting effect on the corrosion behavior. The experimental AlMg-Zn alloys were cast and then heat treated at 200 • C, after the solubilization treatments were made, using different treatment times. These alloys showed important changes in their corrosion mechanisms, but mainly, corrosion started at Al x Mg y Zn z complex phases in both alloys. The optimal corrosion rates were reached after 5 and 24 h of heat treatment. These results were obtained through electrochemical techniques in NaCl solutions, and by metallographic analysis using SEM and optical microscopy.

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Effect of Mg Content on the Performance of Al-Zn-Mg Sacrificial Anodes

Cited by 35 publications

References 8 publications

Influence of turbulent flow on the corrosion of Al‐Zn‐Mg galvanic anode in artificial seawater media

Influence of turbulent flow on the corrosion of Al‐Zn‐Mg galvanic anode in artificial seawater media

Cathodic Protection of Oil Pipelines by Aluminum Alloys

Effect of Experimental Aging on the Performance of Al-7.9Mg-13.3Zn and Al-10.5Mg-8.6Zn Alloys as Sacrificial Anodes

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