An investigation of the corrosion mechanisms of WE43 Mg alloy in a modified simulated body fluid solution: The effect of electrolyte renewal

Ascencio, M.; Pekguleryuz, Mihriban; Omanovic, Sasha

doi:10.1016/j.corsci.2014.11.034

Cited by 99 publications

(57 citation statements)

References 69 publications

(84 reference statements)

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“…Based on this equivalent circuit, the trends of variation of samples at the different FISS conditions were further analyzed to collectively account for the flow-induced corrosion behavior of the Mg alloy. Different from the traditional static test results [20,40], it is interesting that the resistances in the high-frequency capacitive loops are higher than that in the medium-frequency capacitive loops at the dynamic conditions (Fig. 4).…”

Section: Resultscontrasting

confidence: 56%

“…(4):

Z_{CPE} = Q^{- 1} {(j ω)}^{- n} with - 1 \leq n \leq 1

where Z is the CPE impedance (Ω cm 2 ), Q is a constant with units Ω −1 cm −2 s n , n is a dimensionless constant in the range −1 ≤ n ≤ 1, j is the imaginary number j = (−1) 0.5 and Ω is the angular frequency ( Ω = 2π f , f being the frequency in Hz). An ideal capacitor behavior yields n = 1, a resistor yields n = 0 and an inductor yields n = −1, while n = 0.5 represents the response of mass-transport processes [20]. …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is complicated to establish a relationship between fluid dynamics, mass transport, and the chemical and electrochemical reactions occurring on the surface of Mg. There are many parameters [20,21] that have been identified as important factors for the accurate determination of Mg corrosion, and these factors may vary from test to test, as noted by Kirkland [22]. To study these issues more precisely, some combined experiments are developed to make use of the relative merits of individual testing methods in more recent work.…”

Section: Introductionmentioning

confidence: 99%

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Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study

et al. 2016

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An in-situ and real-time electrochemical study in a vascular bioreactor was designed to analyze corrosion mechanism of magnesium alloy (MgZnCa) under mimetic hydrodynamic conditions. Effect of hydrodynamics on corrosion kinetics, types, rates and products was analyzed. Flow-induced shear stress (FISS) accelerated mass and electron transfer, leading to an increase in uniform and localized corrosions. FISS increased the thickness of uniform corrosion layer, but filiform corrosion decreased this layer resistance at high FISS conditions. FISS also increased the removal rate of localized corrosion products. Impedance-estimated and linear polarization-measured polarization resistances provided a consistent correlation to corrosion rate calculated by computed tomography.

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Section: Resultscontrasting

confidence: 56%

“…(4):

Z_{CPE} = Q^{- 1} {(j ω)}^{- n} with - 1 \leq n \leq 1

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study

et al. 2016

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“…Ascencio et al [12] characterized the corrosion behavior of WE43 in modified simulated body fluid using electrochemical impedance spectroscopy and proposed a dual layer surface film for the observed corrosion protection during the initial immersion period up to 96 h. Jamesh et al compared the corrosion behavior of WE43 and ZK60 alloys in Ringer's solution and simulated body fluid. These authors observed that WE43 showed better corrosion resistance than ZK60 due to smaller potential difference between the matrix and intermetallic phases of the WE43 alloy [13].…”

Section: Introductionmentioning

confidence: 98%

“…WE43 alloy has been investigated widely as a potential bioimplant material by several investigators [12][13][14][15]. Ascencio et al [12] characterized the corrosion behavior of WE43 in modified simulated body fluid using electrochemical impedance spectroscopy and proposed a dual layer surface film for the observed corrosion protection during the initial immersion period up to 96 h. Jamesh et al compared the corrosion behavior of WE43 and ZK60 alloys in Ringer's solution and simulated body fluid.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment conditions on the passivation behavior of WE43C Mg–Y–Nd alloy in chloride containing alkaline environments

Ninlachart

Karmiol

Chidambaram

et al. 2017

Journal of Magnesium and Alloys

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Mg-Y-Nd alloy (WE43C or Elektron 43) is a heat treatable magnesium wrought alloy that can be used up to 250°C for aerospace application. This alloy has excellent mechanical properties (UTS: up to 345 MPa at room temperature) and improved corrosion resistance. Electrochemical passivation studies were conducted on this alloy under different heat treatment conditions in 0.1 M NaOH solution with the addition of chloride from 0 to 1000 ppm. The passive potential range typically extended to more than 1.5 VAg/AgCl. The transpassive potential was not dependent on the heat treatment condition of the alloy when the chloride concentration increased up to 500 ppm. However, pitting protection potential varied with the heat treatment condition when the chloride addition was 500 ppm or more. The specimen surface was analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy to understand the passivation behavior of this alloy. The passivated surface of the WE43C specimens indicated that the surface layer consisted of MgO, Mg(OH)2, and rare earth oxide phases, and the heat treatment conditions did not significantly affect the composition of the surface film.

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The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

Asmussen

Binns

Partovi‐Nia

et al. 2015

Materials & Corrosion

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The electrochemical behaviour of two Al‐Mn materials (Al‐ 5.5 at % Mn and Al‐ 13.5 at % Mn) has been studied in 0.275 M NaCl and 0.138 M MgCl2 solutions to simulate the cathodic environment of Al‐Mn particles during the corrosion of a Mg alloy. Upon polarization in NaCl solution to a potential in the range expected on a corroding Mg alloy, the Al‐5.5 at % Mn alloy proved unstable undergoing de‐alloying (loss of Al) and delamination of layers of the Al(OH)3 formed. This leads to a steady increase H2O reduction current. When polarized in MgCl2 solution the surface was partially protected from de‐alloying and the current for H2O reduction suppressed by the deposition of Mg(OH)2. The Al‐13.5 at % Mn alloy was considerably more stable when cathodically polarized. This increased stability was attributed to the higher density of Mn‐enriched areas in the alloy surface. This simulation of the microgalvanic cathodic behaviour of Al‐Mn intermetallic particles confirms that the appearance of corrosion product domes on the Al‐Mn intermetallic particles during the corrosion of Mg alloys as an indication of their cathodic behaviour and that Al‐Mn intermetallic particles are efficient, yet unstable cathodes.

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An investigation of the corrosion mechanisms of WE43 Mg alloy in a modified simulated body fluid solution: The effect of electrolyte renewal

Cited by 99 publications

References 69 publications

Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study

Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study

Effect of heat treatment conditions on the passivation behavior of WE43C Mg–Y–Nd alloy in chloride containing alkaline environments

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

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