Comparison of the corrosion behaviour of AZ31B magnesium alloy under immersion test and potentiodynamic polarization test in NaCl solution

Thirumalaikumarasamy, D.; Shanmugam, K.; Balasubramanian, V.

doi:10.1016/j.jma.2014.01.004

Cited by 65 publications

(30 citation statements)

References 27 publications

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“…As a fundamental and convenient method, mass/weight loss is widely used to investigate the corrosion rate of Mg alloys in vitro [67][68][69][70]. In this study, the weight loss experiment was carried out in α-MEM.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A systematic study of mechanical properties, corrosion behavior and biocompatibility of AZ31B Mg alloy after ultrasonic nanocrystal surface modification

Hou

Qin

Gao

et al. 2017

Materials Science and Engineering: C

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Section: Accepted Manuscriptmentioning

confidence: 99%

A systematic study of mechanical properties, corrosion behavior and biocompatibility of AZ31B Mg alloy after ultrasonic nanocrystal surface modification

Hou

Qin

Gao

et al. 2017

Materials Science and Engineering: C

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“…This is expected to promote corrosion because Cl − has been reported to enhance the dissolution of Mg in neutral solution. 69,70 The corrosion attack is also known to be stabilized by the metal cation hydrolysis and Cl -migration toward anodic sites. 71,72 In the cathodic areas, hydroxide is produced and Na + (aq) ions are accumulated, resulting in high pH values, stabilizing the Mg(OH) 2 passive film.…”

Section: Discussionmentioning

confidence: 99%

Atmospheric Corrosion of Mg Alloy AZ91D Fabricated by a Semi-Solid Casting Technique: The Influence of Microstructure

Esmaily

Mortazavi

Svensson

et al. 2015

J. Electrochem. Soc.

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The atmospheric corrosion behavior of alloy AZ91D produced by a semi-solid metal (SSM) technique and by conventional high pressure die casting (HPDC) was investigated for up to 1176 hours in the laboratory. Alloy AZ91D in the SSM state was fabricated using a rheocasting (RC) technique in which the slurry was prepared by the RheoMetal process. Exposures were performed in 95% RH air at 22 and 4 • C. The RC alloy AZ91D exhibited significantly better corrosion resistance than the HPDC material at two temperatures studied. The effect of casting technology on corrosion is explained in terms of the microstructural differences between the materials. For example, the larger number density of cathodic β phase particles in the HPDC material initially causes relatively rapid corrosion compared to the RC material. During later stages of corrosion, the more network-like β phase particles in the RC alloy act as a corrosion barrier, further improving the relative corrosion resistance of the RC material. Conventional magnesium-aluminum (Mg-Al) alloys, i.e., AZ91D, AM50A and AM60B, offer an exceptional combination of ambient temperature strength and ductility, and good die-castability.1-4 Cast components made of Mg-Al alloys are usually cast by conventional high pressure die casting (HPDC). Despite its advantages over many other casting techniques for producing cast Mg-Al components, there are some inherent problems associated with HPDC. For example, there is a tendency for hot tearing during HPDC due to a relatively wide freezing range and a low solidus temperature. Also, a relatively high fraction of trapped air porosity may form during the turbulent die filling, especially in thick-walled components. Additionally, insufficient resistance to atmospheric and aqueous corrosion sometimes limits Mg-Al alloys applications in the fields of automobiles, aerospace, electronics, etc.5-8 During the past two decades, there have been extensive efforts to increase the corrosion resistance of Mg-Al alloys. Much of the effort has concentrated on the use of various coating systems such as chemical conversion coatings, anodizing, gas-phase deposition processes electro-or electro-less plating, and organic coating. [9][10][11][12][13][14][15] Lowering the impurity levels, alloying, rare earth additions, and heattreatment have also been explored to increase the corrosion resistance of these alloys. [16][17][18][19][20] Alternative casting processes are being developed to resolve the mentioned problems and meet the requirements of future applications of Mg-Al alloys. Semi-solid metal (SSM) processing is a promising manufacturing route capable of producing castings with a high level of complexity. 21,22 The main advantage of SSM processing, compared to the conventional casting processes, is the possibility to have a laminar flow of metal during mold filling.23 This is a consequence of the higher viscosity of the semi-solid material, and it reduces air entrapment compared to die-casting. This results in components with enhanced microstructural proper...

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“…Considering the actual corrosion situation of AZ31B magnesium alloy, the hyphae of A. niger and corrosion products all could adsorb on the surface of matrix and their contributions were indistinguishable, the same equivalent circuit was used in this paper. Thus, two-time constant equivalent circuit was shown in Fig.9, which was applied to pure electronic models that could verify or role out mechanistic models and enable the calculation of numerical values corresponding to the electrochemical system under investigation [44]. In Fig.9, R s was the solution resistance, R ct was the charge transfer resistance, C dl was the CPE parameter for double-layer capacitive, L was inductive impedance resistance, R l was the film resistance in local corrosion region.…”

Section: Page 18 Of 44mentioning

confidence: 99%

“…As it was easy to see from the figure that, the experimental points were preferably close to the fitted points in both cases, that is, the experimental and simulated impedance data were in good agreement, indicating the validity of the equivalent circuit of Fig.9. The EIS parameters of AZ31B magnesium alloy immersed in AS without and with A. niger at 28 ºC for different times were fitted based on the suggested equivalent circuit using ZSimpwin software and given in A c c e p t e d M a n u s c r i p t 19 variation did not have a clear regularity of values in magnitude time, this might be due to the inhomogeneity of the film on the surface of AZ31B magnesium alloy and the location of the pitting corrosion occurred randomly [3,44]; And the heterogeneity of the biofilm was generally reported to be very important to the initiation of localized corrosion and acceleration of corrosion rate, since they could give rise to local differences in metabolic products, pH, or dissolved oxygen (i.e., differential cells), all of which could generate active electrochemical corrosion cell. Our study also demonstrated this, it was easy to seen from our study that R l in the presence of A.…”

Section: Page 18 Of 44mentioning

confidence: 99%

Effect of the fungus, Aspergillus niger , on the corrosion behaviour of AZ31B magnesium alloy in artificial seawater

Wang

et al. 2015

Corrosion Science

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Comparison of the corrosion behaviour of AZ31B magnesium alloy under immersion test and potentiodynamic polarization test in NaCl solution

Cited by 65 publications

References 27 publications

A systematic study of mechanical properties, corrosion behavior and biocompatibility of AZ31B Mg alloy after ultrasonic nanocrystal surface modification

A systematic study of mechanical properties, corrosion behavior and biocompatibility of AZ31B Mg alloy after ultrasonic nanocrystal surface modification

Atmospheric Corrosion of Mg Alloy AZ91D Fabricated by a Semi-Solid Casting Technique: The Influence of Microstructure

Effect of the fungus, Aspergillus niger , on the corrosion behaviour of AZ31B magnesium alloy in artificial seawater

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