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Journal of Materials Engineering and Performance
Erschienen in: Journal of Materials Engineering and Performance 6/2018

03.05.2018

Effect of Sm-Rich Phase on Corrosion Behavior of Hot-Extruded AZ31-1.5Sm Magnesium Alloy

verfasst von: Xiao Li, Zhi Hu, Hong Yan, Xiaoquan Wu, Hecong Xie, Zhou Dong

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 6/2018

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Abstract

The effects of Sm on the corrosion and microstructure behavior of hot-extruded AZ31 magnesium alloy were investigated by SEM, TEM, weight loss analysis, and electrochemical measurements. The results indicated that granular Al2Sm phase ~ 4 μm in size in the hot-extruded AZ31 magnesium alloy modified with 1.5 wt.% Sm leads to significant grain refinement. The corrosion rate decreased from 15.98 × 10−4 to 11.19 × 10−4 g cm−2 h−1 in the transverse section and from 8.57 × 10−4 to 6.20 × 10−4 g cm−2 h−1 in the longitudinal section. Compared to the unmodified alloy, the corrosion potential of the Sm-modified alloy in the transverse and longitudinal sections increased by 98 and 62 mV, respectively, and the Rct value (charge transfer resistance) in the transverse and longitudinal sections of the modified alloy increased from 1764 and 1756 to 2928 and 2408 Ω cm2, respectively. The results showed that the corrosion resistance of hot-extruded AZ31 magnesium alloy was significantly improved by Sm addition due to the grain refinement, the decreased dislocation density, and the suppression of micro-galvanic corrosion caused by Al-Sm-(Mn) intermetallic compounds.
Vorheriger Artikel Evaluation of Delamination of X80 Pipeline Steel Coating Under Alternating Stray Current Via Scanning Electrochemical Microscopy
Nächster Artikel A Correction to the Stress–Strain Curve During Multistage Hot Deformation of 7150 Aluminum Alloy Using Instantaneous Friction Factors

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Metadaten
Titel
Effect of Sm-Rich Phase on Corrosion Behavior of Hot-Extruded AZ31-1.5Sm Magnesium Alloy
verfasst von
Xiao Li
Zhi Hu
Hong Yan
Xiaoquan Wu
Hecong Xie
Zhou Dong
Publikationsdatum
03.05.2018
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 6/2018
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3370-2

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