Si网络连续性对选择性激光熔化AlSi10Mg合金局部腐蚀的影响

IF 7.4 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Futai Zhang , Zhe Liu , Chengcheng Pan , Yida Deng , Da-Hai Xia , Bernard Tribollet
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引用次数: 0

摘要

研究了硅(Si)网络形态对选择性激光熔化(SLM) AlSi10Mg合金在3.5 wt% NaCl溶液中局部腐蚀行为的影响机理。通过200°C和300°C(分别为SR200和SR300)的去应力退火和T6热处理,调节了四种不同的Si组织,即粗Si网络、细Si网络、破碎Si网络和孤立Si颗粒。采用显微组织观察、电化学测试、腐蚀形貌表征、扫描开尔文探针力显微镜(SKPFM)等方法对腐蚀机理进行了鉴定。结果表明,热处理显著改变了Si显微组织的形貌。SLM-AlSi10Mg合金主要在NaCl溶液中发生点蚀,点蚀优先发生在熔池边界(MPB)。合金表面氧化膜呈双层结构,内部为致密的Al2O3层,外部为多孔的Al(OH)3层。网状Si在Al基体上形成更均匀致密的氧化膜,具有更强的防护性。与Si网络相比,Si颗粒在Al基体上的内部致密层更薄,导致保护作用减弱。SKPFM分析表明,随着Si网络的粗化,Si和Al基体之间的电位差增大,MPB由于电位差较大而成为优先腐蚀区域。本研究为优化SLM-AlSi10Mg合金的耐蚀性提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Si network continuity on the localized corrosion of AlSi10Mg alloy fabricated by selective laser melting
This paper aims to investigate the influence mechanism of silicon (Si) network morphology on the localized corrosion behavior of AlSi10Mg alloy prepared by selective laser melting (SLM) in 3.5 wt% NaCl solution. Four different Si microstructures, i.e., coarse Si network, fine Si network, broken Si network, and isolated Si particles, were regulated through stress relief annealing at 200 °C and 300 °C (designated as SR200 and SR300 respectively), and T6 heat treatment. Microstructure observation, electrochemical testing, corrosion morphology characterization, and scanning Kelvin probe force microscopy (SKPFM) are used to identify the corrosion mechanism. The results show that heat treatment significantly changes the morphology of Si microstructure. The SLM-AlSi10Mg alloy mainly undergoes pitting corrosion in NaCl solution, and pitting preferentially occurs at the molt pool boundary (MPB). The oxide film on the alloy surface has a bilayer structure: inner dense Al2O3 layer and outer porous Al(OH)3 layer. A more uniform and dense oxide film with stronger protectiveness is formed on Al matrix with networked Si. The inner dense layer on Al matrix with the particulate Si is thinner than with the Si network, resulting in weakened protectiveness. SKPFM analysis reveals that the potential difference between Si and Al matrix increases with the coarsening of the Si network, and the MPB becomes a preferential corrosion area due to the larger potential difference. This study provides a theoretical basis for optimizing the corrosion resistance of SLM-AlSi10Mg alloy.
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来源期刊
Corrosion Science
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.
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