Influence of Rare Earth Element (Y) on Microstructure and Corrosion Behavior of Hot Extrusion AZ91 Magnesium Alloy

Cui, Yanan; Wang, Yonghai; Cui, Zhongyu; Qi, Wenlong; Wang, Jidong; Ju, Pengfei; Zhang, Xiaochen; Liu, Bin; Zhang, Tao; Wang, Fuhui

doi:10.3390/ma13163651

Cited by 13 publications

(8 citation statements)

References 40 publications

(57 reference statements)

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“…However, the cast RE1 alloy (containing 1 wt-% RE) exhibited a remarkably better corrosion resistance than the RE0 alloy (containing 1 wt-% Sr) owing to the better effect of RE elements on the modification of β phase and also lower Volta-potential values of the Al 11 RE 3 particles compared to that of the Al 4 Sr phase. Furthermore, previous studies showed that the RE elements could assist the formation of a more compact RE-containing corrosion layer, resulting in the improvement of the corrosion resistance of AZ91 alloy [20,24,25]. Thus, for another reason, the RE-containing alloys showed better corrosion resistance than the Srcontaining alloys.…”

Section: The Results In Tablementioning

confidence: 96%

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Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Afsharnaderi

Lotfpour

Bahmani

et al. 2023

Materials Science and Technology

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The synergetic effect of strontium (Sr) and rare earth elements (RE) on the corrosion properties of as-cast Mg–9Al–1Zn alloy were studied. Via the addition of 0.5 wt-% RE and 0.5 wt-% Sr (RE/Sr ratio of 1), a remarkable reduction in the corrosion rate of AZ91 was observed. The reason was found to be related to the decrement of the micro-galvanic corrosion by the modification of the β-Mg17Al12 phase (changing its morphology from semi-continuous to a more spheroid shape) and formation of proper amounts of Al11RE3 and Al4Sr intermetallics. However, the excess RE/Sr ratio impaired the corrosion resistance, which can be related to the micro-galvanic effect by excess amounts of Al11RE3 and Al4Sr intermetallics.

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Section: The Results In Tablementioning

confidence: 96%

“…Furthermore, previous studies showed that the RE elements could assist the formation of a more compact RE-containing corrosion layer, resulting in the improvement of the corrosion resistance of AZ91 alloy [20,24,25]. Thus, for another reason, the RE-containing alloys showed better corrosion resistance than the Sr-containing alloys.…”

Section: Resultsmentioning

confidence: 99%

Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Afsharnaderi

Lotfpour

Bahmani

et al. 2023

Materials Science and Technology

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“…RE elements can improve the mechanical strength and creep resistance ( Cui et al, 2020 ), refine the grain, and synthesize precipitated phases. RE elements, such as Y, lead to the formation of a protective antioxidant film on the surface of the Mg matrix after heat laser fabrication; WE43 alloys demonstrate excellent degradation resistance ( Liu et al, 2022a ).…”

Section: Degradation Behavior and Typical Strategies To Enhance The C...mentioning

confidence: 99%

Comprehensive review of additively manufactured biodegradable magnesium implants for repairing bone defects from biomechanical and biodegradable perspectives

et al. 2022

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Bone defect repair is a complicated clinical problem, particularly when the defect is relatively large and the bone is unable to repair itself. Magnesium and its alloys have been introduced as versatile biomaterials to repair bone defects because of their excellent biocompatibility, osteoconductivity, bone-mimicking biomechanical features, and non-toxic and biodegradable properties. Therefore, magnesium alloys have become a popular research topic in the field of implants to treat critical bone defects. This review explores the popular Mg alloy research topics in the field of bone defects. Bibliometric analyses demonstrate that the degradation control and mechanical properties of Mg alloys are the main research focus for the treatment of bone defects. Furthermore, the additive manufacturing (AM) of Mg alloys is a promising approach for treating bone defects using implants with customized structures and functions. This work reviews the state of research on AM-Mg alloys and the current challenges in the field, mainly from the two aspects of controlling the degradation rate and the fabrication of excellent mechanical properties. First, the advantages, current progress, and challenges of the AM of Mg alloys for further application are discussed. The main mechanisms that lead to the rapid degradation of AM-Mg are then highlighted. Next, the typical methods and processing parameters of laser powder bed fusion fabrication on the degradation characteristics of Mg alloys are reviewed. The following section discusses how the above factors affect the mechanical properties of AM-Mg and the recent research progress. Finally, the current status of research on AM-Mg for bone defects is summarized, and some research directions for AM-Mg to drive the application of clinical orthopedic implants are suggested.

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“…There are several approaches to increase the corrosion resistance of Mg and its alloys, including internal methods such as the modification of alloy composition/microstructure (fabrication of high-purity alloys, refinement of microstructure, etc.) [ 12 , 17 , 18 , 19 , 20 ]. The external methods include surface treatment and coating processes (electroplating, chemical conversion coating, electrochemical conversion coating, laser/ion or electron beam treatment, sol-gel coating, and organic coating, etc.)…”

Section: Introductionmentioning

confidence: 99%

Advances in the Modification of Silane-Based Sol-Gel Coating to Improve the Corrosion Resistance of Magnesium Alloys

2023

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As the lightest structural materials, magnesium (Mg) alloys play a significant role in vehicle weight reduction, aerospace, military equipment, energy saving, and emission reduction. However, the poor corrosion resistance of Mg alloys has become a bottleneck restricting its wide application. Developing a good surface protective coating can effectively improve the corrosion resistance of Mg alloys. The silane-based sol-gel coating technology has been widely used in the corrosion protection of Mg alloys in recent years due to its advantages of simple process, accessible tailoring of film composition and structure, and excellent corrosion resistance. Whereas the synthesis of sol-gel coatings includes the hydrolysis and dehydration process, which may inherently contain micron or nano defects in the coatings, thereby making it detrimental to the anti-corrosion effect. Therefore, in order to enhance their protection against corrosion, the appropriate modification of sol-gel coatings has become a current research hotspot. This review is based on the modification methods of silane-based sol-gels on the surface of Mg alloys, which are divided into four categories: bare sol-gel, nanoparticles, corrosion inhibitors, and sol-gel-based composite coatings. The modification methods and corrosion protection mechanism are discussed respectively, and the application, development, and research strategies of silane-based sol-gel coatings are included.

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Influence of Rare Earth Element (Y) on Microstructure and Corrosion Behavior of Hot Extrusion AZ91 Magnesium Alloy

Cited by 13 publications

References 40 publications

Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Comprehensive review of additively manufactured biodegradable magnesium implants for repairing bone defects from biomechanical and biodegradable perspectives

Advances in the Modification of Silane-Based Sol-Gel Coating to Improve the Corrosion Resistance of Magnesium Alloys

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