用于增材制造的新型Al-Fe-Zr合金的腐蚀行为

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-05 DOI:10.1016/j.corsci.2025.113292

Reynier I. Revilla , Rubén del Olmo , Kitty Baert , Ilya Ostrovsky , Loïc Malet , Stéphane Godet , Iris De Graeve

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引用次数: 0

摘要

研究了激光粉末床熔合制备的增材制造（AM） Al-Fe-Zr合金的腐蚀行为。该合金是针对高强度和高导电性应用而开发的，并作为传统6xxx系列合金的替代品，传统6xxx系列合金在PBF-LB加工过程中容易热裂。多尺度表征（SEM， EBSD， SKPFM， XPS和电化学测试）表明，PBF-LB过程中的快速凝固产生了高度精细的微观结构，其中含有纳米级Fe-Al金属间颗粒（IMPs），导致表面伏特电位范围窄。与传统的AA6060相比，这些特性有助于增强电化学均匀性，降低局部腐蚀的敏感性。在NaCl溶液中的动电位极化测试表明，AM Al-Fe-Zr合金与AA6060的整体性能相当，而浸泡测试表明，AM合金具有较低的点蚀敏感性，这是由于微观组织的细化和天然氧化膜成分的改性。XPS分析证实，在原生膜中加入了Fe和zr基氧化物，可能会提高AM合金的稳定性，并增强其耐腐蚀性。尽管如此，在熔池水平上观察到非均质性，熔池边界（mpb）呈现较粗的imp和无夹杂区（IFZs）。这些区域是局部攻击的优先位置，偶尔会沿着mpb排列腐蚀。

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Corrosion behaviour of novel Al-Fe-Zr alloy developed for additive manufacturing

This study investigates the corrosion behaviour of an additively manufactured (AM) Al-Fe-Zr alloy produced by laser-based powder bed fusion (PBF-LB). The alloy was developed to target high strength and conductivity applications and as a substitute for conventional 6xxx series alloys, which suffer from hot cracking during PBF-LB processing. Multiscale characterization (SEM, EBSD, SKPFM, XPS, and electrochemical testing) revealed that the rapid solidification during PBF-LB produces a highly refined microstructure with nanoscale Fe-Al intermetallic particles (IMPs), resulting in a narrow surface Volta potential range. These features contribute to enhanced electrochemical homogeneity and reduced susceptibility to localized corrosion compared with conventional AA6060. Potentiodynamic polarization tests in NaCl solution indicated comparable overall performance between the AM Al-Fe-Zr alloy and AA6060, while immersion tests demonstrated that the AM alloy exhibited lower pitting susceptibility, attributed to microstructural refinement and the modified composition of the native oxide film. XPS analysis confirmed the incorporation of Fe- and Zr-based oxides into the native film, potentially improving stability and supporting the enhanced corrosion resistance of the AM alloy. Nonetheless, heterogeneities were observed at the level of the melt pools, with the melt pool boundaries (MPBs) presenting coarser IMPs and inclusion-free zones (IFZs). These regions acted as preferential sites for localized attack, occasionally aligning corrosion along MPBs.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.