The influence of Ca on the corrosion behavior of new die cast Mg–Al-based alloys for elevated temperature applications

Dabah, Eitan; Ben-Hamu, G.; Лисицын, В. М.; Eliezer, D.; Shin, Kwang Seon

doi:10.1007/s10853-010-4302-1

Cited by 21 publications

(8 citation statements)

References 23 publications

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“…Thus, an increase in the volume fraction of the second phases thus a continuous phase along grain boundaries is observed. [ 34 ] Moreover, the Al–Mn particles were notable coarser in the case of the MRI153M compared with the AZ91D, as highlighted in the insert in Figure 1d.…”

Section: Resultsmentioning

confidence: 96%

“…The intermetallic compounds contain Al and Ca and are much less cathodic than the β‐phase, thus making the microgalvanic effect in the specimen less effective. [ 34 ]…”

Section: Introductionmentioning

confidence: 99%

“…The intermetallic compounds contain Al and Ca and are much less cathodic than the β-phase, thus making the microgalvanic effect in the specimen less effective. [34] MRI153 is a casting magnesium alloy, which has been developed based on AZ91 alloy by Dead Sea Magnesium and Volkswagen AG and is used in automotive transmission housing. [35] High levels of Al (9 wt%) and Zn (1 wt%) contents improve the alloy's yield strength and castability, while Ca (1 wt%) and Sr (0.1 wt%) are added to form intermetallic phases at grain boundaries and inside the grains to improve creep resistance.…”

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confidence: 99%

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Thixomolded AZ91D and MRI153M magnesium alloys and their enhanced corrosion resistance

Buzolin

Volovitch

Maltseva

et al. 2020

Materials & Corrosion

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AZ91D and MRI153M alloys were produced by thixomolding. Their corrosion resistance is significantly higher than that of similar materials produced by ingot or die‐casting. A corrosion rate smaller than 0.2 mm/year in 5 wt% NaCl solution is measured for the thixomolded AZ91D alloy. The corrosion behaviour was evaluated using immersion tests, electrochemical impedance spectroscopy, hydrogen evolution, glow discharge optical emission spectroscopy, and atomic emission spectroelectrochemistry. A bimodal microstructure is observed for both alloys, with the presence of coarse primary α‐Mg grains, fine secondary α‐Mg grains, β‐phase, and other phases with a minor volume fraction. The amount of coarse primary α‐Mg is significantly higher for the AZ91D compared with the MRI153M. The network of β‐phase around the fine secondary α‐Mg grains is better established in the thixomolded AZ91D alloy. A combination of several factors such as the ratio of primary to secondary α‐Mg grains, localised corrosion or barrier effect due to other phases, as well as regions of preferential dissolution of the α‐Mg due to chemical segregation, are thought to be responsible for the high corrosion resistance exhibited by the thixomolded AZ91D and MRI153M.

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Section: Resultsmentioning

confidence: 96%

“…The intermetallic compounds contain Al and Ca and are much less cathodic than the β‐phase, thus making the microgalvanic effect in the specimen less effective. [ 34 ]…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Thixomolded AZ91D and MRI153M magnesium alloys and their enhanced corrosion resistance

Buzolin

Volovitch

Maltseva

et al. 2020

Materials & Corrosion

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“…912) In addition, it is reported using scanning Kelvin probe force microscopy that the differences in galvanic potential between Al 2 Ca and ¡-Mg phases are smaller than that between ¢-Mg 17 Al 12 (or AlMn) and ¡-Mg phases. 23,24) Thus, the galvanic effect of the ¡-Mg matrix with the Al 2 Ca phases should be weaker than that with the ¢-Mg 17 Al 12 and AlMn phases. These are likely a reason for the lower corrosion rate of the as-cast AZX612 alloy than that of the AZ61 alloy.…”

Section: Microstructuresmentioning

confidence: 99%

Effects of Solution Treatment on Corrosion Properties of Mg–6 mass%Al–1 mass%Zn–2 mass%Ca (AZX612) and Mg–6 mass%Al–1 mass%Zn (AZ61) Alloys

et al. 2018

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The effects of solution treatment on the corrosion properties of Mg6 mass%Al1 mass%Zn2 mass%Ca (AZX612) alloy were investigated, and the results were compared with those for Mg6 mass%Al1 mass%Zn (AZ61) alloy. Solution treatment at 693 K for 48 h significantly reduced the corrosion rates of both AZX612 and AZ61 alloys in 5 mass% NaCl solution. After solution treatment, not only intermetallic phases but also the Al-rich ¡ phase around intermetallic phases reduced or dissolved in both alloys. The microstructural evolution induced by solution treatment may inhibit galvanic corrosion and pit-like corrosion, leading to improvement in the corrosion resistance of AZX612 and AZ61 alloys.

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“…At present, purification treatment, alloying, surface treatment and rapid solidification are mainly used to improve the corrosion resistance of Mg alloy [5,6] , and alloying is widely used because of the convenience and obvious results [7,8] . Some researches indicate that the microstructure can be refined, the second phases can be formed and the electrode potential of the matrix can be improved to improve the corrosion resistance through adding Ca, Sr, Ce, Nd and Y elements [9][10][11][12][13][14][15][16] . But little research has been done on the influence of adding both Ca and Y on the corrosion resistance.…”

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confidence: 99%

Influences of Ca and Y Addition on the Microstructure and Corrosion Resistance of Vacuum Die-Cast AZ91 Alloy

Wang

Liu

et al. 2014

Acta Metall. Sin. (Engl. Lett.)

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The influence of Ca and Y on the microstructure and corrosion resistance of vacuum die casting AZ91 alloy is investigated using optical microscope, electron scanning microscope, weight-loss test and electrochemical corrosion test. The results indicate that the microstructure of AZ91 alloy can be refined, amount of Mg 17 Al 12 phases is reduced, making Mg 17 Al 12 phases transform from banding to reticular, and stringer Al 2 Ca phases and block Al 2 Y phases are formed through adding both Ca and Y. The corrosion resistance of AZ91 magnesium alloy can be increased greatly by adding both Ca and Y. The corrosion rate of AZ91-1.5Ca-1.0Y alloy is dropped to 16.2% of that of AZ91 alloy immersed in 3.5% NaCl aqueous solution for 24 hours. The corrosion current density of AZ91-1.5Ca-1.0Y alloy is dropped by one order of magnitude.

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The influence of Ca on the corrosion behavior of new die cast Mg–Al-based alloys for elevated temperature applications

Cited by 21 publications

References 23 publications

Thixomolded AZ91D and MRI153M magnesium alloys and their enhanced corrosion resistance

Thixomolded AZ91D and MRI153M magnesium alloys and their enhanced corrosion resistance

Effects of Solution Treatment on Corrosion Properties of Mg–6 mass%Al–1 mass%Zn–2 mass%Ca (AZX612) and Mg–6 mass%Al–1 mass%Zn (AZ61) Alloys

Influences of Ca and Y Addition on the Microstructure and Corrosion Resistance of Vacuum Die-Cast AZ91 Alloy

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