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Corrosion et protection de l'alliage de magnésium AZ91 élaboré selon différentes voies, et caractérisation électrochimique des différentes phases constitutives

Abstract : The magnesium alloys of nominal composition AZ91D (9%Al, 1%Zn) have a low corrosion rate, associated with good mechanical properties. The factors leading to their degradation are still insufficiently known. When the alloy is one phase made, it presents paradoxically a higher corrosion rate than the two phase composed alloy. The first part of this document deals with the microstructural and electrochemical study of the AZ91D alloys, elaborated by several casting methods. The constitutive phases were synthesised and characterised using electrochemical measurements. The corrosion resistance of the semi-solid AZ91D alloys is due both to the low galvanic coupling and to the properties of the surface film. The second part evidences the inhibitory properties of the corrosion of sodium decanoate for the pure magnesium and AZ91D. The inhibition mechanism involves the formation of a film composed of trihydrated magnesium decanoate. The crystallographic structure of this compound was determined.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0193_MATHIEU.pdf
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Submitted on : Thursday, March 29, 2018 - 10:40:46 AM
Last modification on : Thursday, October 22, 2020 - 3:15:34 PM

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Stéphane Mathieu. Corrosion et protection de l'alliage de magnésium AZ91 élaboré selon différentes voies, et caractérisation électrochimique des différentes phases constitutives. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10193⟩. ⟨tel-01746586⟩

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