Review of the atmospheric corrosion of magnesium alloys

Liu, Hongguang; Cao, Fuyong; Song, Guang‐Ling; Zheng, Dajiang; Shi, Zhiming; Dargusch, Matthew S.; Atrens, Andrej

doi:10.1016/j.jmst.2019.05.001

Cited by 143 publications

(60 citation statements)

References 146 publications

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“…For the AZ91 alloy, the hydrogen evolution (Equation 2) is the main reaction on the cathodic branch of the polarization curve [3,23]. According to [30], AZ91 magnesium alloy dissolves in the corrosive aqueous solution forming Mg(OH) 2 as described by Equations (1)- (3).…”

Section: Electrochemical Polarization Measurementsmentioning

confidence: 99%

“…Moreover, in the presence of Cl − ions in the solution, this layer is being constantly disrupted. As a result, MgCl 2 soluble in the water solution (corrosive environment) is formed (Equation (4)) [3,21,31]. The formation of MgCl 2 disrupts the compactness of protective Mg(OH) 2 layer.…”

Section: Electrochemical Polarization Measurementsmentioning

confidence: 99%

“…The formed layer grew with the exposure time. However, this layer is chemically unstable in water solutions and in solutions containing Cl − ions [3,30]. This passive layer broke down between 4 and 8 h of exposition, resulting in uncovering of the metallic substrate surface.…”

Section: Electrochemical Impedance Spectroscopy Characteristicsmentioning

confidence: 99%

“…Figure 5b shows that a pitting occurred during the exposition in 0.1 M NaCl solution, which can be reflected in the inductive response of Nyquist plots (Figure 5a). The pitting is typical for the magnesium alloys [3,21,35]. The behavior is the consequence of different potential of Mg solid solution and of present intermetallic phase particles and eutectics, creating a galvanic couple [3,22].…”

Section: Electrochemical Impedance Spectroscopy Characteristicsmentioning

confidence: 99%

“…Due to low weight, magnesium and its alloys show great potential in the field of automotive, aerospace, and electrochemical applications [1][2][3]. Magnesium alloys have low density, high modulus, good strength to weight ratio and physical properties [4].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of AZ91 Alloy Corrosion Properties by Duplex NI-P Coating Deposition

et al. 2020

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The corrosion behavior of duplex Ni-P coatings deposited on AZ91 magnesium alloy was studied. The electroless deposition process of duplex Ni-P coating consisted in the preparation of low-phosphorus Ni-P coating (5.7 wt.% of P), which served as a bond coating and high-phosphorus Ni-P coating (11.5 wt.% of P) deposited on it. The duplex Ni-P coatings with the thickness of 25, 50, 75 and 100 µm were deposited on AZ91 magnesium alloy. The electrochemical corrosion behavior of coated AZ91 magnesium alloy was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization method in 0.1 M NaCl. Obtained results showed a significant improvement in the corrosion resistance of coated specimens when compared to uncoated AZ91 magnesium alloy. From the results of the immersion tests in 3.5 wt.% NaCl, 10% solution of HCl and NaOH and 5% neutral salt spray, a noticeable increase in the corrosion resistance with the increasing thickness of the Ni-P coating was observed.

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Section: Electrochemical Polarization Measurementsmentioning

confidence: 99%

Section: Electrochemical Polarization Measurementsmentioning

confidence: 99%

Section: Electrochemical Impedance Spectroscopy Characteristicsmentioning

confidence: 99%

Section: Electrochemical Impedance Spectroscopy Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of AZ91 Alloy Corrosion Properties by Duplex NI-P Coating Deposition

et al. 2020

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Influence of commercial corrosion‐inhibiting compounds on the atmospheric corrosion of the magnesium alloys EV31A, WE43B, ZE41A and pure magnesium

Soltan

Dargusch

Shi

et al. 2020

Materials & Corrosion

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The influence of four commercial corrosion-inhibiting compounds on the atmospheric corrosion of EV31A, WE43B, ZE41A and pure Mg was studied at two hot, humid, tropical sites for test periods of 3-12 months. LPS 3 and AMLGuard significantly reduced the corrosion rates, with AMLGuard being most effective with inhibition efficiencies above 85%. In contrast, Ardrox 3961 and LPS 2 were ineffective with typical corrosion rates comparable with those of the bare alloys. Corrosion inhibition was tentatively attributed to protective durable barrier films formed by chemical adsorption for LPS 3 and AMLGuard.

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Corrosion mechanisms of AZ31 magnesium alloy: Importance of starting pH and its evolution

Prince

Noirfalise

Paint

et al. 2022

Materials & Corrosion

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This article aims at improving the understanding of the corrosion mechanism of AZ31 magnesium alloys during a long period of immersion in an aqueous electrolyte. In particular, the influence of the starting pH of the electrolyte on the oxidation of AZ31 alloy and its evolution due to corrosion phenomena were investigated. Several electrolytes with different pH values containing or not chlorides were used. The electrochemical properties of the metal substrate in these electrolytes were studied as a function of immersion time by electrochemical impedance spectroscopy. The kinetics of the reactions were determined by potentiodynamic polarization as well as dihydrogen evolution measurements by eudiometry. All these tests were carried out while the sample surface and electrolyte volume remained constant. The corrosion products generated on the alloy surface were analyzed by X‐ray photoelectrons spectrometry. This study has shown that the evolution of the corrosion rate and the corrosion products depends greatly on the initial pH and the nature of the used electrolyte. Alkaline electrolyte leads to a passive protective layer that can be locally destroyed by chloride ions. For a neutral chloride electrolyte, the strong increase of the pH due to the magnesium corrosion is not able to form a protective layer by precipitation of corrosion products. The kinetic and the corrosion extent are affected by the pH changes.

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Review of the atmospheric corrosion of magnesium alloys

Cited by 143 publications

References 146 publications

Improvement of AZ91 Alloy Corrosion Properties by Duplex NI-P Coating Deposition

Improvement of AZ91 Alloy Corrosion Properties by Duplex NI-P Coating Deposition

Influence of commercial corrosion‐inhibiting compounds on the atmospheric corrosion of the magnesium alloys EV31A, WE43B, ZE41A and pure magnesium

Corrosion mechanisms of AZ31 magnesium alloy: Importance of starting pH and its evolution

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