Microstructure and electrochemical behavior of AZ91 Mg Alloy produced by laser powder bed fusion
The corrosion behavior of the laser powder bed fusion (LPBF) AZ91 magnesium alloy was investigated by comparing its longitudinal and transverse sections with the cast AZ91 alloy. Microstructural analysis revealed a fine, homogeneous Mg<inf>17</inf>Al<inf>12</inf> distribution...
| Autores: | , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/402604 |
| Acesso em linha: | http://hdl.handle.net/10261/402604 https://api.elsevier.com/content/abstract/scopus_id/105016874188 |
| Access Level: | acceso abierto |
| Palavra-chave: | Additive manufacturing Selective laser melting Mg alloys AZ91 Microstructure Corrosion resistance Hydrogen evolution |
| Resumo: | The corrosion behavior of the laser powder bed fusion (LPBF) AZ91 magnesium alloy was investigated by comparing its longitudinal and transverse sections with the cast AZ91 alloy. Microstructural analysis revealed a fine, homogeneous Mg<inf>17</inf>Al<inf>12</inf> distribution in LPBF samples, contrasting with the network-like structure in the cast alloy. Electrochemical and hydrogen evolution tests demonstrated no significant anisotropy in LPBF sections, but they exhibited higher corrosion rates than the cast alloy. Potentiodynamic polarization and electrochemical impedance spectroscopy confirmed that the corrosion process was cathodically controlled by the Mg<inf>17</inf>Al<inf>12</inf> phase fraction. Scanning vibrating electrode technique further validated these findings, highlighting lower electrochemical activity in cast AZ91 alloy. |
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