AC impedance spectroscopy study of the corrosion behavior of an AZ91 magnesium alloy in 0.1M sodium sulfate solution

Chen, Jian; Wang, Jianqiu; Han, En‐Hou; Dong, Jie; Ke, Wei

doi:10.1016/j.electacta.2006.10.007

Cited by 203 publications

(80 citation statements)

References 16 publications

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“…This is attributed to the formation of a corrosion product film at the sample surface. As already discussed, the main corrosion products are Mg(OH) 2 ions [47], corrosion of AZ91 alloy proceeds at OCP according to reactions (1) and (9-10). Moreover, SO 4 2− ions can be reduced, and reactions (11)(12) can also proceed.…”

Section: Global and Local Electrochemical Behaviour Of Az91 In 01 M mentioning

confidence: 99%

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The use of a multiscale approach in electrochemistry to study the corrosion behaviour of as-cast AZ91 magnesium alloy

Kot

Krawiec

2015

J Solid State Electrochem

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The microstructure of as-cast AZ91 alloy is complex, with the presence of Mg 17 (Al, Zn) 12 precipitates surrounded by an eutectic phase, AlMn intermetallic particles and an α-Mg solid solution. In addition, the distribution of aluminium in the alloy was found to be heterogeneous. Under these conditions, a multiscale approach coupling global and local electrochemical measurements seems to be a promising method to study its corrosion behaviour. Results show that the multiscale approach can be used in 0.1 M NaCl. In this case, AZ91 is susceptible to pitting corrosion. By contrast, the multiscale approach is not valid for AZ91 in 0.1 M Na 2 SO 4 . At the global scale, filiform corrosion and pitting corrosion are observed in the matrix, whereas only pits initiate when using the microcapillary techniques. The obtained results show that the local electrochemical techniques have to be used carefully in some environments.

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Section: Global and Local Electrochemical Behaviour Of Az91 In 01 M mentioning

confidence: 99%

“…The overall reaction is given by Reaction (8 The aluminium content in the matrix with corrosion products (Site 3, Table 2) is higher than that in the matrix (site 2, Table 2 [46,47]. Therefore, the main corrosion products should be Mg(OH) 2 and MgAl 2 (OH) 8 *H 2 O.…”

Section: -Mg Dendritementioning

confidence: 99%

The use of a multiscale approach in electrochemistry to study the corrosion behaviour of as-cast AZ91 magnesium alloy

Kot

Krawiec

2015

J Solid State Electrochem

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“…The capacitive loop is related to the property of the electric double layer at the electrode/electrolyte interface [43]. Two inductive loops in the fourth quadrant are due to the chemical reaction of Mg + with H2O on the breaking area of the corrosion products film and the desorption of corrosion products respectively [44,45]. Since the EIS plots reveal the physical and chemical dynamic processes via the analysis of spectra, a circuit model can be founded to simulate the practical variations on the electrode surface.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…The capacitive loop is related to the property of the electric double layer at the electrode/electrolyte interface [43]. Two inductive loops in the fourth quadrant are due to the chemical reaction of Mg + with H 2 O on the breaking area of the corrosion products film and the desorption of corrosion products respectively [44,45]. It is obvious that indium affects the cathodic process (hydrogen evolution) slightly but favors anodic dissolution (oxidation of magnesium), seen by analyzing the slope values of bc and ba in Table 2 [32].…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Corrosion and Discharge Behaviors of Mg-Al-Zn and Mg-Al-Zn-In Alloys as Anode Materials

Wan

Sun

et al. 2016

Metals

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Abstract:The Mg-6%Al-3%Zn and Mg-6%Al-3%Zn-(1%, 1.5%, 2%)In alloys were prepared by melting and casting. Their microstructures were investigated via metallographic and energy-dispersive X-ray spectroscopy (EDS) analysis. Moreover, hydrogen evolution and electrochemical tests were carried out in 3.5 wt% NaCl solution aiming at identifying their corrosion mechanisms and discharge behaviors. The results suggested that indium exerts an improvement on both the corrosion rate and the discharge activity of Mg-Al-Zn alloy via the effects of grain refining, β-Mg 17 Al 12 precipitation, dissolving-reprecipitation, and self-peeling. The Mg-6%Al-3%Zn-1.5%In alloy with the highest corrosion rate at free corrosion potential did not perform desirable discharge activity indicating that the barrier effect caused by the β-Mg 17 Al 12 phase would have been enhanced under the conditions of anodic polarization. The Mg-6%Al-3%Zn-1.0%In alloy with a relative low corrosion rate and a high discharge activity is a promising anode material for both cathodic protection and chemical power source applications.

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“…Among various methods for elucidating corrosion mechanism, AC impedance spectroscopy is the most favorable electrochemical technique since it can provide a quantitative measurement for corrosion [2]. Many researchers have been studying the degradation mechanism of such materials as pure metals, metal alloys, and surface-coated specimens using AC impedance spectroscopy [2][3][4][5][6][7][8].…”

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confidence: 99%

Current status and advances in corrosion researches

Pyun

Lee

2009

J Solid State Electrochem

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AC impedance spectroscopy study of the corrosion behavior of an AZ91 magnesium alloy in 0.1M sodium sulfate solution

Cited by 203 publications

References 16 publications

The use of a multiscale approach in electrochemistry to study the corrosion behaviour of as-cast AZ91 magnesium alloy

The use of a multiscale approach in electrochemistry to study the corrosion behaviour of as-cast AZ91 magnesium alloy

Corrosion and Discharge Behaviors of Mg-Al-Zn and Mg-Al-Zn-In Alloys as Anode Materials

Current status and advances in corrosion researches

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