Corrosion of friction stir welded magnesium alloy AM50

Zeng, Rong‐Chang; Chen, Jun; Dietzel, W.; Zettler, R.; Santos, Jorge F. dos; Nascimento, M. L.; Kainer, Karl Ulrich

doi:10.1016/j.corsci.2009.04.031

Cited by 86 publications

(44 citation statements)

References 12 publications

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“…Based on these results, it can be readily observed that the corrosion behavior of the parent alloy significantly varies from that of the welded joint region; while in many previous reports, FSW has similar and sometimes a better corrosion resistance than that of the parent alloy 9,25 . This can be attributed to the heterogeneity of the microstructure in weld regions rather than parent alloys.…”

Section: Electrochemical Behaviormentioning

confidence: 82%

Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy

Gharavi

Матори

Yunus³

et al. 2014

Mat. Res.

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In this work, the corrosion behaviors of friction-stir lap welding of 6061-T6 Al-alloy are studied. The friction-stir lap welding was performed under different welding conditions (rotation speed and welding speed). The corrosion behavior of the parent alloy, the weld nugget zone (WNZ), and the heat affected zone (HAZ) of each welded sample working as an electrode, were investigated by the Tafel polarization test in 3.5 wt. (%) NaCl at ambient temperature. The morphology of the corroded surface of each region was analyzed by scanning electron microscopy together with energy dispersive spectroscopy (SEM-EDS). The results showed that the corrosion resistance of the parent alloy was better than the WNZ and the HAZ in both welding conditions. Localized pit dissolution and intergranular corrosion were the dominant corrosion types observed in the parent alloy, WNZ, and HAZ. The parent alloy, WNZ, and HAZ exhibited similar corrosion potentials (E corr ) after T6 heat treatment. This treatment had a better effect on the corrosion resistance of the welded regions than the parent alloy.

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Section: Electrochemical Behaviormentioning

confidence: 82%

Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy

Gharavi

Матори

Yunus³

et al. 2014

Mat. Res.

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“…Before testing, an Mg(OH) 2 powder was placed in the test solution to obtain a saturated Mg(OH) 2 NaCl solution, which could produce a consistent rate of corrosion [7]. The immersion test was performed at 25 ∘ C in a constant-temperature chamber for a corrosion time of 24, 72, 168, 264, 336 and 432 h, separately [7].…”

Section: Corrosion Processmentioning

confidence: 99%

“…Magnesium alloys are promising candidates to replace steel and aluminum alloys in many struc-tural and mechanical applications owing to their attractive properties of excellent castability, good machinability, superior damping capacity, outstanding stiffness-to-weight ratio, and ease of recyclability [2][3][4]. The AM50 alloy is one of the most successfully-used magnesium alloys in the automotive industry; however, its application is still limited by its strength and most especially its poor corrosion resistance [5,6].…”

Section: Introductionmentioning

confidence: 99%

Corrosion and mechanical properties of AM50 magnesium alloy after modified by different amounts of rare earth element Gadolinium

et al. 2016

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Abstract:To improve the corrosion and mechanical properties of the AM50 magnesium alloy, different amounts of the rare earth element gadolinium were used. The microstructure, corrosion and mechanical properties were evaluated by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and electrochemical and mechanical stretch methods. The results indicate that, with Gd addition, the amount of the Al 2 Gd 3 phase increased while the β-Mg 17 Al 12 phase amount decreased. Due to the Gd addition, the grain of the AM50 magnesium alloy was significantly refined, which improved its tensile strength. Further, the decrease in the amount of the β phase improved the corrosion resistance of the alloy. The fracture mechanism of the Gd-modified AM50 magnesium alloy was a quasi-cleavage fracture. Finally, the optimum corrosion residual strength of the AM50 magnesium alloy occurred with 1 wt.% of added Gd.

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“…Mg-alloys are susceptible to several forms of localized corrosion, whilst also highly prone to macro-as well as micro-galvanic corrosion. Due to the low solid solubility of most alloying elements in Mg 6 and particularly low solubility limits for most transition elements; secondary phases readily form during most types of material processing, including casting 7,8 and welding, [9][10][11][12][13][14][15] which can adversely alter the corrosion performance.…”

mentioning

confidence: 99%

Exploring the Effects of Intermetallic Particle Size and Spacing on the Corrosion of Mg-Al Alloys Using Model Electrodes

Bland

Birbilis

Scully

2016

J. Electrochem. Soc.

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The effect of the area fraction, size and distribution of model cathodic, intermetallic particles (IMPs) in an anodic Mg matrix on corrosion was investigated. Model Mg-Al electrodes were developed to study IMP effects in isolation from other metallurgical effects, with particles simulated by Al electrodes embedded in a Mg matrix. Arrays of model Mg-Al electrodes were constructed using high purity Al as a surrogate for Al-rich IMPs and flush mounted in commercial purity Mg. The area fraction, size and spacing of these electrodes each altered the corrosion rate and cathodic reaction kinetics assessed after a 24 and 48 hour immersion period at the open circuit potential. Corrosion rate increased with increasing area fraction of Al electrodes but decreased with increasing electrode spacing given a fixed area fraction. The affected zone around electrodes and at the Al/Mg interface was explored to ascertain its impact on the resultant global corrosion rate and kinetics. The effect of local pH at the Al electrode on the prospects for Al corrosion and chemical redeposition were also explored. Magnesium (Mg) alloys continue to be of growing interest due to their good balance of specific properties (i.e. properties relative to weight).1-3 However, due to the inherently negative electrochemical potential of Mg and its alloys, 4,5 Mg-alloys are highly reactive compared to other engineering metals. Mg-alloys are susceptible to several forms of localized corrosion, whilst also highly prone to macro-as well as micro-galvanic corrosion. Due to the low solid solubility of most alloying elements in Mg 6 and particularly low solubility limits for most transition elements; secondary phases readily form during most types of material processing, including casting 7,8 and welding, 9-15 which can adversely alter the corrosion performance.There are many secondary phases, or intermetallic particles (IMPs), which are particularly common in Mg alloys. Each IMP 16 has its own unique dissolution or reduction kinetics, dependent on its composition, size and dispersion within the material. For example, in the Mg-Al alloys which contain Mn (such as AZ31, AZ91 and AM50), Al-Mn IMPs that are rich in Al such as Al 4 Mn, Al 6 Mn, display relatively low rates of cathodic kinetics in comparison to other IMPs that are rich in Mn such as Al 8 Mn 5 ; the latter displaying relatively rapid cathodic kinetics. 1,7,17 Similarly, the so called Al-Mn-Fe IMPs, such as Al 8 (Mn,Fe) 5 function as highly potent cathodic sites in Mg, although the Mn has been shown to prevent some of the detrimental galvanic effects of Fe impurities by incorporating the Fe into the Al-Mn IMPs. 1,6,16 Furthermore, Mg-Zn IMPs have approximately the same open circuit potential (OCP) as many Mg alloys. However, the cathodic kinetics of this IMP are more rapid than Mg, 16 attributed to the presence of Zn. Mg-Zn IMPs are cathodic to the α-Mg and, therefore, tend to cause localized corrosion through micro-galvanic coupling which is often manifest at the Mg matrix/IMP interface. Some ...

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Corrosion of friction stir welded magnesium alloy AM50

Cited by 86 publications

References 12 publications

Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy

Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy

Corrosion and mechanical properties of AM50 magnesium alloy after modified by different amounts of rare earth element Gadolinium

Exploring the Effects of Intermetallic Particle Size and Spacing on the Corrosion of Mg-Al Alloys Using Model Electrodes

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