A study on the SCC susceptibility of friction stir welded AZ31 Mg sheet

Kannan, M. Bobby; Dietzel, W.; Zeng, Rong‐Chang; Zettler, R.; Santos, Jorge F. dos

doi:10.1016/j.msea.2007.01.065

Cited by 83 publications

(29 citation statements)

References 12 publications

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“…The anodic dissolution tendency of magnesium in aqueous environments is due to its high electronegative potential and to the fact that the corrosion product/film formed on magnesium is not protective, especially in chloride-containing environment. Hence, magnesium and its alloys are susceptible to localized corrosion, such as pitting, and to SCC in chloride-containing environment [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Pitting-induced hydrogen embrittlement of magnesium–aluminium alloy

Kannan

Dietzel

2012

Materials & Design

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a b s t r a c tIn this study, the pitting corrosion susceptibility and its role on the hydrogen embrittlement behaviour of AZ80 magnesium alloy were studied using slow strain rate testing (SSRT), electrochemical technique and immersion test method. The electrochemical and immersion tests in chloride-containing solution revealed severe pitting corrosion in the alloy. The SSRT results of the alloy under continuously-exposed conditions in chloride-containing solution and in distilled water showed that the mechanical properties of the alloy deteriorated considerably in both the solutions. Pre-exposure of the alloy in distilled water did not show any considerable change in the mechanical properties of the alloy, however in chloride-containing solution a significant loss in the mechanical properties was noticed. Cleavage facets were observed in the vicinity of the localized attacked region of the alloy pre-exposed in chloride-containing solution. Interestingly, desiccating the pre-exposed (in chloride-containing solution) samples reduced the loss in the mechanical properties, which could be attributed to reversible hydrogen. Thus, the study suggests that pitting corrosion facilitates hydrogen entry into the alloy and causes hydrogen embrittlement.

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Section: Introductionmentioning

confidence: 99%

Pitting-induced hydrogen embrittlement of magnesium–aluminium alloy

Kannan

Dietzel

2012

Materials & Design

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“…69 The presence of Fe as impurity plays a crucial role in SCC, especially in the impure alloys. 79 The fracture was observed at a stress level of around 100 MPa with a strain of 2% compared to the strain level of about 45% in the tests in air. 77,78 In a recent work, the SCC susceptibility of an extruded magnesium alloy (AZ31) in ASTM D 1384 test solution (Figure 12) was addressed.…”

Section: Environmentally Assisted Damagesmentioning

confidence: 89%

Corrosion of Magnesium and its Alloys

Kainer¹,

Srinivasan²,

Blawert³

et al. 2010

Shreir's Corrosion

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“…Studies have shown that the SCC of Mg alloys occurs through transgranular stress corrosion cracking (TGSCC), intergranular stress corrosion cracking (IGSCC), or a mixed TGSCC/IGSCC mode 43,44) . The mode of SCC depends on the composition 44) and microstructure 45) of the alloy and possibly on environmental factors such as pH 25) .…”

Section: Effect Of Sn Content On Crack Propagationmentioning

confidence: 99%

Effect of Microstructure Factors on Stress Corrosion Behavior of Mg<i>-x</i>Sn Alloys (<i>x</i> = 2, 5, 8 mass%)

2016

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The effect of microstructure on the stress corrosion behavior of Mg-Sn alloys was investigated using a bent-beam method. The effects of an Mg 2 Sn phase and Sn in the matrix on stress corrosion were investigated. Mg 2 Sn phase mainly formed at the grain boundary. The volume fraction of the Mg 2 Sn phase increased with increasing Sn content, and the morphology of Mg 2 Sn changed from spherical to a semi-continuous network. The average volume fractions of Mg 2 Sn phase increased from 0.07 ± 0.02% to 5.06 ± 0.92% as the Sn content was increased from 2 to 8 mass%. An increase in the amount of Mg 2 Sn phase increased the pit density, whereas dissolution of the Mg 2 Sn phase into the matrix resulted in decreased pit density. An intergranular cracking mode was observed. The solution heat treatment dissolved the Mg 2 Sn phase and eliminated the micro-galvanic corrosion due to Mg 2 Sn, thereby delaying crack initiation also enhancing stress corrosion resistance. Mg-8%Sn sample through solution heat treatment showed the best stress corrosion resistance.

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A study on the SCC susceptibility of friction stir welded AZ31 Mg sheet

Cited by 83 publications

References 12 publications

Pitting-induced hydrogen embrittlement of magnesium–aluminium alloy

Pitting-induced hydrogen embrittlement of magnesium–aluminium alloy

Corrosion of Magnesium and its Alloys

Effect of Microstructure Factors on Stress Corrosion Behavior of Mg<i>-x</i>Sn Alloys (<i>x</i> = 2, 5, 8 mass%)

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