Corrosion Studies of Rapidly Solidified Magnesium Alloys

Makar, G. L.; Krüger, J.

doi:10.1149/1.2086455

Cited by 331 publications

(198 citation statements)

References 13 publications

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“…Grain refinement brought more grain boundaries, contributing to the higher corrosion resistance compared to the coarse one. Research showed that the initial film layer formed on Mg-Al alloys substrate would be Al 2 O 3 , accompanied by MgO outside covered with Mg(OH) 2 in aqueous solution [26,27]. Higher fraction of oxide film was expected to form on the fine-grained sample.…”

Section: Discussionmentioning

confidence: 99%

Stress Corrosion Cracking Behavior of Fine-Grained AZ61 Magnesium Alloys Processed by Equal-Channel Angular Pressing

Xie

Jiang

et al. 2017

Metals

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Abstract:The effect of equal-channel angular pressing (ECAP) on stress corrosion cracking (SCC) behavior of a cast AZ61 Mg alloy was investigated in distilled water (DW) using the slow strain rate tensile test (SSRT) at a strain rate of 1 × 10 −6 s −1 . The fine-grained alloy after ECAP showed a greater SCC susceptibility but a higher ultimate tensile strength, compared with the as-cast counterpart. The results were attributed to refined grains, high-density dislocations and increased proportion of high-angle grain boundaries induced by severe plastic deformation, as well as isolated fine β-phase particles transiting from net-like β-phase.

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Section: Discussionmentioning

confidence: 99%

Stress Corrosion Cracking Behavior of Fine-Grained AZ61 Magnesium Alloys Processed by Equal-Channel Angular Pressing

Xie

Jiang

et al. 2017

Metals

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“…Brett et al [24] also found that the pitting formation leads to the inductive loop in the impedance spectra. According to the studies of Makar and Kruger [25] , Cao Chu'nan [26] , and Song G. et al [27] , the bigger high-frequency capacitive loops are related to the better corrosion resistance. Namely, the corrosion resistance sequence in as-cast, T4 and T6 conditions can be listed in the order as follows: T4>T6>as-cast.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Effect of heat treatment on corrosion behavior of low pressure sand cast Mg-10Gd-3Y-0.5Zr alloys

Wei

et al. 2016

China Foundry

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M agnesium alloys containing heavy rare earth elements are of high strength and low density, which makes them very attractive as structural materials in applications, for example, aircraft and space machinery, and ground transport including racing automobiles, where weight saving is of great importance [1][2][3] . It has been reported that the recently developed Mg-Gd-Y-Zr alloys such as Mg-10Gd-3Y-0.5Zr alloy show considerable precipitation hardening, leading to improved specific strength at both room and elevated temperatures, and better creep resistance than conventional Al and Mg alloys [4][5][6] . According to the literature [7,8] , Mg-10Gd-3Y-0.5Zr alloy is employed to produce complicated Abstract:The corrosion behaviors of low-pressure sand cast Mg-10Gd-3Y-0.5Zr (wt.%) alloys in as-cast, solution treated (T4) and aged (T6) conditions were studied by means of immersion test and electrochemical measurements in 5wt.% NaCl solution saturated with Mg(OH) 2 . It was observed that the corrosion rate in the T4 condition was lower than that of the as-cast and T6 conditions by both sand casting and permanent mold casting with the same order of as-cast>T6>T4; while the corrosion resistance of the permanent mold casting is superior to the sand casting. The morphologies of the corrosion products are similar porous structures consisting of tiny erect flakes perpendicular to the corroded surface of the alloy, irrespective of the heat treatment conditions. Especially, the corrosion film in T4 condition is more compact than that in the other two conditions. In addition, the severer corrosion happening to the as-cast condition is correlated with the galvanic corrosion between the matrix and the eutectic compounds; while improved corrosion resistance for the T4 and T6 conditions is ascribed to the dissolution of the secondary eutectic compounds. The measured corrosion current densities of Mg-10Gd-3Y-0.5Zr alloys in as-cast, T4, and T6 conditions are 36 μA·cm components by low-pressure sand casting (LPSC) in production for the combination of higher strength and higher ductility than other Mg-Gd-Y alloys. Moreover, LPSC is an appropriate technique to produce Mg components, especially those with thin-walls (2-5 mm) and complex geometry [9] . In the past few years, many investigations related to the microstructure, mechanical properties and corrosion behaviors of the Mg-10Gd-3Y-0.5Zr alloys cast in metal molds have been reported. However, there are few research reports about the sandmold casting magnesium alloys, especially for the corrosion behaviors.It is well known that an alloy produced by lowpressure sand-casting process has a different microstructure (as precipitation sequence, phase type and composition, grain size etc.) and mechanical behaviors compared to an alloy produced by permanent mold casting process due to the different cooling rate [10,11] , which will make the different casting alloys show different corrosion behaviors. Many extensive

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“…Polarization resistance ratio for the fluorine resin coating (FLR) with added metal particles (Yabuki & Sakai, 2011) Magnesium and its alloys have many excellent properties, such as the lowest densities among industrial metals. Poor resistance to corrosion, however, limits the application of these materials in corrosive environments (Makar & Kruger, 1990;Song et al, 1997;Ambat et al, 2000;Song et al, 1999). Thus, protective coatings with improved resistance are needed.…”

Section: Figure 3 Schematic Diagram Of the Electrochemical Impedancementioning

confidence: 99%

Self-Healing Coatings for Corrosion Inhibition of Metals

Yabuki¹

2015

MAS

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Anti-corrosion protective coatings have been widely applied as a surface treatment to prevent corrosion of various metallic materials, such as aluminum alloys, magnesium alloys, steel and zinc-coated steel, which are used in automobile parts, building structures, home appliances, etc. One of the most important characteristics of these coatings is the ability to self-heal. If a self-healing coating suffers mechanical damage and corrosive species in the environment begin to degrade the bare metal surface, the damaged surface is automatically repaired by a chemical component of the coating. Chromate conversion coatings have self-healing properties. However, environmental concerns have necessitated the reduction and discontinuation of chromate-based protective coatings in recent years. This paper describes two recently developed self-healing coatings -a fluorine polymer coating with metal particles and a coating comprised of particles and an organic healing agent. A fluorine polymer coating has self-healing properties, which are improved by the addition of metal particles. A self-healing coating that uses particles and an organic healing agent has also been developed.

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Corrosion Studies of Rapidly Solidified Magnesium Alloys

Cited by 331 publications

References 13 publications

Stress Corrosion Cracking Behavior of Fine-Grained AZ61 Magnesium Alloys Processed by Equal-Channel Angular Pressing

Stress Corrosion Cracking Behavior of Fine-Grained AZ61 Magnesium Alloys Processed by Equal-Channel Angular Pressing

Effect of heat treatment on corrosion behavior of low pressure sand cast Mg-10Gd-3Y-0.5Zr alloys

Self-Healing Coatings for Corrosion Inhibition of Metals

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