Corrosion performance of additively manufactured bimetallic aluminum alloys

To restore defected AA2618 alloy molds, remanufacturing of the damaged areas using AlSi10Mg alloy through laser powder bed fusion (L-PBF) technique is proposed. This study in particular focuses on the corrosion characteristics of the fabricated L-PBF AlSi10Mg / cast AA2618 bimetal structure in aerat...

Full description

Saved in:
Bibliographic Details
Published inElectrochimica acta Vol. 389; p. 138689
Main Authors Fathi, Parisa, Rafieazad, Mehran, Mohseni-Sohi, Elham, Sanjari, Mehdi, Pirgazi, Hadi, Shalchi Amirkhiz, Babak, Ghonchech, Mohammadhossein, Nasiri, Ali, Mohammadi, Mohsen
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.09.2021
Elsevier BV
Subjects
AA2618
Additive manufacturing
Aeration
Alloys
AlSi10Mg
Aluminum base alloys
Bimetals
Corrosion
Corrosion effects
Dissimilar metals
Galvanic corrosion
Intermetallic compounds
Iron
L-PBF
Microstructure
Powder beds
Remanufacturing
Silicon
AlSi10Mg
Corrosion
L-PBF
Additive manufacturing
Microstructure
AA2618
Dissimilar metals
Online AccessGet full text

Cover

More Information
Summary:To restore defected AA2618 alloy molds, remanufacturing of the damaged areas using AlSi10Mg alloy through laser powder bed fusion (L-PBF) technique is proposed. This study in particular focuses on the corrosion characteristics of the fabricated L-PBF AlSi10Mg / cast AA2618 bimetal structure in aerated 3.5 wt.% NaCl electrolyte with respect to the individual alloys. The L-PBF AlSi10Mg side of the bimetal sample was characterized with a superior corrosion response and the highest passive film stability compared with the cast AA2618 side and the dissimilar sample (prepared from the interface region), ascribed to its homogeneous microstructure, containing a very fine network of eutectic Si embedded in a fine grained and supersaturated α-Al matrix. The overall corrosion performance of the dissimilar sample was found to be between the cast AA2618 and L-PBF AlSi10Mg part, with no sign of macro-galvanic corrosion effect between the dissimilar alloys. The heavily precipitated microstructure of the cast AA2618 alloy, particularly the anodic Al2CuMg phase and cathodic Fe-containing intermetallics versus the Al-matrix, dictated the inferior corrosion properties of the cast sample and the cast side of the dissimilar sample.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.138689