Pitting-induced hydrogen embrittlement of magnesium–aluminium alloy
Kannan, M. Bobby, and Dietzel, W. (2012) Pitting-induced hydrogen embrittlement of magnesium–aluminium alloy. Materials and Design, 42 . pp. 321-326.
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In 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.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||magnesium alloy; hydrogen embrittlement; stress corrosion; pitting corrosion|
|FoR Codes:||09 ENGINEERING > 0912 Materials Engineering > 091207 Metals and Alloy Materials @ 100%|
|SEO Codes:||86 MANUFACTURING > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861199 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) not elsewhere classified @ 100%|
|Deposited On:||13 Aug 2012 16:31|
|Last Modified:||18 Oct 2013 01:34|
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