电弧增材制造镍铝青铜中κ相的形态和组成对局部腐蚀的影响

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

Corrosion Science Pub Date : 2025-09-20 DOI:10.1016/j.corsci.2025.113343

Ayda Shahriari , Sajad Shakerin , Nick Birbilis , Mohsen Mohammadi

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引用次数: 0

摘要

本研究探讨了k相形态和化学成分对电弧增材制造（WAAM）镍铝青铜（NAB）局部腐蚀的影响。除了电化学分析外，该研究还利用聚焦离子束（FIB）铣削、扫描透射电子显微镜（TEM）和x射线显微分析来检测暴露于含氯化物环境后WAAM-NAB样品的微观结构特征。结果表明，相对于α-相，κ-相表现出所谓的“阴极”行为；然而，它们的高贵性不仅受到构图的影响，还受到形态的影响。值得注意的是，细长的κ相——尽管富含ni - al——促进了局部腐蚀，这与它们的界面面积增加有关。功函数和化学势分析表明，相形态在局部腐蚀中起着关键作用。这项工作强调了微观结构在控制waam制造合金腐蚀机制中的关键作用，以及纳米尺度表征提供的关键见解。

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On the morphology and composition of κ-phases on localized corrosion in wire arc additive manufacturing nickel aluminum bronze

This study explores the influence of κ-phase morphology and chemical composition upon localized corrosion in wire arc additively manufactured (WAAM) nickel aluminum bronze (NAB). In addition to electrochemical analyses, the study utilized focused ion beam (FIB) milling, scanning transmission electron microscopy (TEM), and x-ray microanalysis to examine microstructural features in WAAM-NAB samples after exposure to a chloride-containing environment. It was determined that κ-phases exhibited so-called ‘cathodic’ behavior relative to the α-phase; however, their nobility was affected not only by composition, but also by morphology. Notably, elongated κ-phases - despite being Ni-Al-rich - promoted localized corrosion, which is associated with their increased interfacial area. Work function and chemical potential analyses support that phase morphology can have a key role in localized corrosion. This work highlights the critical role of microstructure in governing corrosion mechanisms in WAAM-fabricated alloys and the key insights provided by characterization at the nanoscale.

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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.