Abstract
The corrosion resistance of AZ31 magnesium alloy is strongly related to the microstructure, while the corrosion process leads to the production of atomic hydrogen that can penetrate the magnesium lattice and provoke stress corrosion cracking (SCC). The rate of SCC depends on the magnitude of hydrogen diffusion in magnesium and its alloys. In this work, analysis was made of the hydrogen diffusion coefficient and corrosion resistance of AZ31 alloy solubilized at 440 °C for 24 h and submitted to aging heat treatment at 220 °C for 6 and 12 h. Hydrogen permeation tests showed that aging of the AZ31 alloy did not affect the hydrogen diffusion coefficient (D). The D value found in this work (~5.0·10−9 m2 s−1) was in accordance with recent data for Mg. Before performing the corrosion resistance tests, the samples were anodized by micro-arc oxidation at ambient or subzero temperature, in order to improve the corrosion resistance. The samples aged for 12 h and anodized at subzero temperature presented the highest incorporation of silicon, the presence of Mg2SiO4, and the highest corrosion resistance in Hank’s solution.
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Acknowledgments
The authors are grateful for the technical and financial support provided by Instituto Militar de Engenharia (IME), Companhia Siderúrgica Nacional (CSN), Instituto de Química de São Carlos (IQSC, USP), and Pro-Reitoria de Pesquisa, Pós-Graduacão e Inovação (PROPPI) of Universidade Federal Fluminense (FOPESQ-2020 and 2021 financial support program). The authors would also like to thank Daniel Cardoso for assistance in the anodization process. This study was partially financed by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES, Finance Code 001).
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Rodrigues, P.S., Zenóbio, I.R., da Silva, T.I. et al. Effect of Aging on Corrosion Resistance of AZ31 Magnesium Alloy. J. of Materi Eng and Perform 33, 3413–3425 (2024). https://doi.org/10.1007/s11665-023-08170-3
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DOI: https://doi.org/10.1007/s11665-023-08170-3