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第二相对超级双相不锈钢UNS S 32750钝化层的影响：锂离子电池外壳材料的高级安全性

Effect of Secondary Phase on Passivation Layer of Super Duplex Stainless Steel UNS S 32750: Advanced Safety of Li-Ion Battery Case Materials.

作者信息

Shin Byung-Hyun, Kim Seongjun, Park Jinyong, Ok Jung-Woo, Kim Dohyung, Yoon Jang-Hee

机构信息

Busan Centre, Korea Basic Science Institute, Busan 46742, Republic of Korea.

Innovative Graduate Education Program for Global High-Tech Materials and Parts, Pusan National University, Busan 46241, Republic of Korea.

出版信息

Materials (Basel). 2024 Jun 5;17(11):2760. doi: 10.3390/ma17112760.

DOI:10.3390/ma17112760
PMID:38894024
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11173509/
Abstract

Aluminum, traditionally the primary material for battery casings, is increasingly being replaced by UNS S 30400 for enhanced safety. UNS S 30400 offers superior strength and corrosion resistance compared to aluminum; however, it undergoes a phase transformation owing to stress during processing and a lower high-temperature strength. Duplex stainless steel UNS S 32750, consisting of both austenite and ferrite phases, exhibits excellent strength and corrosion resistance. However, it also precipitates secondary phases at high temperatures, which are known to form through the segregation of Cr and Mo. Various studies have investigated the corrosion resistance of UNS S 32750; however, discrepancies exist regarding the formation and thickness of the passivation layer. This study analyzed the oxygen layer on the surface of UNS S 32750 after secondary-phase precipitation. The microstructure, volume fraction, chemical composition, and depth of O after the precipitation of the secondary phases in UNS S 32750 was examined using FE-SEM, EDS, EPMA and XRD, and the surface chemical composition and passivation layer thickness were analyzed using electron probe microanalysis and glow-discharge spectroscopy. This study demonstrated the segregation of alloy elements and a reduction in the passivation-layer thickness after precipitation from 25 μm to 20 μm. The findings of the analysis aid in elucidating the impact of secondary-phase precipitation on the passivation layer.

摘要

铝，传统上作为电池外壳的主要材料，正越来越多地被UNS S 30400所取代，以提高安全性。与铝相比，UNS S 30400具有更高的强度和耐腐蚀性；然而，它在加工过程中会因应力而发生相变，且高温强度较低。双相不锈钢UNS S 32750由奥氏体和铁素体相组成，具有优异的强度和耐腐蚀性。然而，它在高温下也会析出二次相，已知这些二次相是通过Cr和Mo的偏析形成的。各种研究都对UNS S 32750的耐腐蚀性进行了研究；然而，关于钝化层的形成和厚度存在差异。本研究分析了二次相析出后UNS S 32750表面的氧层。使用场发射扫描电子显微镜（FE-SEM）、能谱仪（EDS）、电子探针微分析仪（EPMA）和X射线衍射仪（XRD）对UNS S 32750二次相析出后的微观结构、体积分数、化学成分和氧的深度进行了检测，并使用电子探针微分析和辉光放电光谱对表面化学成分和钝化层厚度进行了分析。本研究表明，合金元素发生了偏析，析出后钝化层厚度从25μm减小到20μm。分析结果有助于阐明二次相析出对钝化层的影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/a5e249f5347f/materials-17-02760-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/a5e249f5347f/materials-17-02760-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/51bcd119c20b/materials-17-02760-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/0393808b8ad8/materials-17-02760-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/ec7f5658d0cc/materials-17-02760-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/3e07daa2a3ad/materials-17-02760-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/9ba4f619c326/materials-17-02760-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b3d2/11173509/a5e249f5347f/materials-17-02760-g010.jpg

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