Intermetallic-Rich Layer Formation for Improving Corrosion Resistance of Magnesium Alloys

D. Calderón, Y. Galindez, L. Toro, A. A. Zuleta, A. Valencia-Escobar, P. Chacón, E. Correa, F. Echeverría

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations

    Abstract

    Abstract: The present work examines the formation of a corrosion protective coating containing intermetallic phases on magnesium alloy substrates. The protective coating was formed on the surfaces of commercially pure magnesium (cp Mg) and AZ31B magnesium alloy by vacuum thermal evaporation of commercially pure aluminium (cp Al) and a subsequent heat treatment of the sample. This coating was continuous, homogenous and its microstructure was a eutectic phase composed by clusters of α-Mg surrounded by β phase (Mg17Al12). This eutectic-type coating provided 168 and 504 h of protection inside the salt spray chamber for the cp Mg and AZ31 alloy samples, respectively. To achieve this, it was required to deposit at least 5.5 µm of cp Al and then perform a combined thermal treatment involving heating the samples to 583 K for 60 min and then raising the temperature to 693 K for 5 min. Graphic Abstract: [Figure not available: see fulltext.]

    Original languageEnglish
    Pages (from-to)657-665
    Number of pages9
    JournalMetals and Materials International
    Volume28
    Issue number3
    DOIs
    StatePublished - Mar 2022

    Bibliographical note

    Funding Information:
    The authors are grateful to Universidad de Antioquia, Universidad Pontificia Bolivariana, Universidad de Medellín and Servicio Nacional de Aprendizaje – SENA. This work was supported by COLCIENCIAS [Grant Number FP44842-023-2017].

    Funding Information:
    The authors are grateful to Universidad de Antioquia, Universidad Pontificia Bolivariana, Universidad de Medellín and Servicio Nacional de Aprendizaje – SENA. This work was supported by COLCIENCIAS [Grant Number FP44842-023-2017].

    Publisher Copyright:
    © 2021, The Korean Institute of Metals and Materials.

    Keywords

    • AZ31B magnesium alloy
    • Coating
    • Pure magnesium
    • Vacuum thermal evaporation
    • α-Mg phase
    • β (MgAl) phase

    Fingerprint

    Dive into the research topics of 'Intermetallic-Rich Layer Formation for Improving Corrosion Resistance of Magnesium Alloys'. Together they form a unique fingerprint.

    Cite this