Controlling the Salt Water Corrosion Performance of Magnesium AZ91 Alloy

Reichek, K. N.; Clark, Kathryn J.; Hillis, James E.

doi:10.4271/850417

Cited by 69 publications

(56 citation statements)

References 1 publication

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“…These two alloys have a smaller grain size (< 22.3 μm) and a larger amount of Mn. According to literature, Mn forms intermetallic particles with Fe, which are less favourable to promoting galvanic dissolution; thus, Mn increases the Fe tolerance limit (Lee et al, 2009;Reichek et al, 1985). Hence, Mn can reduce the negative influence of Fe on the corrosion behaviour, explaining the slower degradation behaviour of pure Mg and Mg-10Gd discs in vitro.…”

Section: Degradation Rate Analysismentioning

confidence: 99%

“…The H 2 evolution gave lower DR compared to the ML method. This difference can be explained by the particle undermining model (Song and Atrens, 1999), and perhaps the dissolution of hydrogen in the Mg sample (Atrens et al, 2015;Remennik et al, 2011;Zainal Abidin et al, 2013).…”

Section: Degradation Rate Analysismentioning

confidence: 99%

“…(iii) Mg metal can store significant amounts of hydrogen (Nogita et al, 2009). Many authors use the dissolution of hydrogen in the Mg sample to explain the difference between the DRs calculated by hydrogen evolution and by ML (Atrens et al, 2015;Remennik et al, 2011;Zainal Abidin et al, 2013). (iv) Mg-RE alloys, e.g.…”

Section: In Vivomentioning

confidence: 99%

“…This shows the large influence of impurities on the biodegradation behaviour. Mg degradation is highly influenced not only by impurities (Hanawalt et al, 1942;Hofstetter et al, 2015a;Hofstetter et al, 2015b;Lee et al, 2009;Liu et al, 2009;Reichek et al, 1985;Yang et al, 2015), but also by alloys addition and grain size . Furthermore, the degradation conditions and the performance of the formed surface layer have also an impact (Walker et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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In vivo and in vitro degradation comparison of pure Mg, Mg-10Gd and Mg-2Ag: a short term study

Marco

Myrissa²,

Martinelli³

et al. 2017

eCM

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The purpose of this study was to compare short term in vitro and in vivo biodegradation studies with low purity Mg (> 99.94 %), Mg-10Gd and Mg-2Ag designed for biodegradable implant applications. Three in vitro testing conditions were applied, using (i) phosphate buffered saline (PBS), (ii) Hank's balanced salt solution (HBSS) and (iii) Dulbecco's modified eagle medium (DMEM) in 5 % CO 2 under sterile conditions. Gas evolution and mass loss (ML) were assessed, as well as the degradation layer, by elemental mapping and scanning electron microscopy (SEM). In vivo, implantations were performed on male Sprague-Dawley rats evaluating both, gas cavity volume and implant volume reduction by micro-computed tomography (µCT), 7 d after implantation. Samples were produced by casting, solution heat treatment and extrusion in disc and pin shape for the in vitro and in vivo experiments, respectively. Results showed that when the processing of the Mg sample varied, differences were found not only in the alloy impurity content and the grain size, but also in the corrosion behaviour. An increase of Fe and Ni or a large grain size seemed to play a major role in the degradation process, while the influence of alloying elements, such as Gd and Ag, played a secondary role. Results also indicated that cell culture conditions induced degradation rates and degradation layer elemental composition comparable to in vivo conditions. These in vitro and in vivo degradation layers consisted of Mg hydroxide, Mg-Ca carbonate and Ca phosphate.

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Section: Degradation Rate Analysismentioning

confidence: 99%

Section: Degradation Rate Analysismentioning

confidence: 99%

Section: In Vivomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In vivo and in vitro degradation comparison of pure Mg, Mg-10Gd and Mg-2Ag: a short term study

Marco

Myrissa²,

Martinelli³

et al. 2017

eCM

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“…However, the corrosion resistance in high purity magnesium is not so poor but comparable to those on die cast aluminum alloys or carbon steels. 1) Heavy metal impurities deterioratively affect corrosion resistance on magnesium.…”

Section: Introductionmentioning

confidence: 99%

High-purity Magnesium Coating on Magnesium Alloys by Vapor Deposition Technique for Improving Corrosion Resistance

et al. 2003

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Microstructures in coated magnesium alloy with high purity magnesium fabricated by applying a vacuum deposition technique were investigated. Moreover, relationships between microstructures in coated and un-coated magnesium alloys and corrosion behaviors were interpreted by in-situ laser microscopic observations during salt immersion tests. Magnesium with 3N-grade and AZ31 magnesium alloy were used for an evaporation source and a substrate for deposition. Temperature of the substrates was changed resulting in change in temperature profile in a furnace in order to optimize deposition coating conditions for obtaining homogeneous microstructures and thickness in deposited layer. The coated specimen revealed superior corrosion resistance to those on 3N-Mg, AZ31 and AZ91E alloys, and comparable to that on 6N-Mg in salt immersion tests using 3% NaCl solution at 300 K for 587 ks. In-situ observations showed that inhomogeneity in microstructures, such as second phases and grain boundary segregations, deteriorate corrosion resistance in magnesium alloys. Therefore, pure magnesium coated layer without inhomogeneity in metallographic and electrochemical meanings can improve the corrosion resistance on magnesium alloys.

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Corrosion Mechanisms of Magnesium Alloys

Song

Atrens²

1999

Adv. Eng. Mater.

2,100

730

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The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium and provides the basis for the design of new alloys with improved corrosion properties.

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Controlling the Salt Water Corrosion Performance of Magnesium AZ91 Alloy

Cited by 69 publications

References 1 publication

In vivo and in vitro degradation comparison of pure Mg, Mg-10Gd and Mg-2Ag: a short term study

In vivo and in vitro degradation comparison of pure Mg, Mg-10Gd and Mg-2Ag: a short term study

High-purity Magnesium Coating on Magnesium Alloys by Vapor Deposition Technique for Improving Corrosion Resistance

Corrosion Mechanisms of Magnesium Alloys

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