Passivity and breakdown mechanisms in laser powder bed fusion processed Ni-based Alloy 625: Influence of scan strategy

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

Corrosion Science Pub Date : 2025-06-20 DOI:10.1016/j.corsci.2025.113129

Arshad Yazdanpanah , Mattia Franceschi , Gioele Pagot , Mona Khodabakhshi , Edoardo Fassinato , Lisa Zotta , Theresa Hanemann , Abdul Shaafi Shaikh , Vito Di Noto , Iris De Graeve , Katya Brunelli , Reynier I. Revilla

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Abstract

This study investigates the influence of scan strategy on the microstructure, electrochemical behaviour, and passive film stability of Ni-Cr-based Alloy 625 fabricated via Laser Powder Bed Fusion (L-PBF). Four distinct scan strategies of No Pattern 180, No Pattern, Stripes, and Chess were evaluated under identical processing parameters. While hardness and subgrain size remained largely unaffected, significant differences were observed in dislocation density, which strongly correlated with passive layer integrity. Electrochemical analyses revealed that higher dislocation densities, particularly in the No Pattern 180 strategy, led to lower current densities in both passive and breakdown regions, despite similar corrosion potentials and Volta-potential values across all strategies. Mott-Schottky analysis confirmed reduced defect densities in the passive oxide layer of high-dislocation samples, and potentiostatic testing under tensile loading showed fewer breakdown events compared to low-dislocation samples. The results emphasize the importance of scan strategy choice not only for mechanical properties, but also for optimising corrosion resistance in additively manufactured components.

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激光粉末床熔合ni基625合金的钝化及击穿机理：扫描策略的影响

研究了扫描策略对激光粉末床熔合镍铬基625合金微观结构、电化学行为和被动膜稳定性的影响。在相同的加工参数下，对No Pattern 180、No Pattern、Stripes和Chess四种不同的扫描策略进行了评估。虽然硬度和亚晶粒尺寸基本未受影响，但位错密度却存在显著差异，这与被动层的完整性密切相关。电化学分析表明，较高的位错密度，特别是在No Pattern 180策略中，导致钝化和击穿区域的电流密度较低，尽管所有策略的腐蚀电位和伏特电位值相似。Mott-Schottky分析证实，与低位错样品相比，高位错样品的被动氧化层缺陷密度降低，拉伸载荷下的恒电位测试显示击穿事件较少。结果强调了扫描策略选择的重要性，不仅对机械性能，而且对优化增材制造部件的耐腐蚀性。

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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.