原位生成TiB2制备的AlZnMgCu/TiB2复合材料的腐蚀行为

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-03-20 DOI:10.1016/j.jmrt.2025.03.183

Jianjun Wang , Ziyu He , Xiaogang Li , Kai Lu , Xiao Wang , Lu Li , Zhentao Yuan , Zhaolin Zhan , Wenshen Tang

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引用次数: 0

摘要

通过原位生成TiB2陶瓷颗粒，经热挤压和热处理制备了AlZnMgCu/TiB2复合材料。采用XRD、SEM、EDS和TEM等表征了二次相的组成、晶格结构和分布。通过电化学阻抗谱、电位极化测量和腐蚀形貌分析研究了复合材料的腐蚀行为。讨论了MgZn2、Al2Cu析出相和TiB2陶瓷颗粒对腐蚀行为的影响。结果表明：TiB2陶瓷颗粒沿挤压方向和晶界分布；纳米MgZn2和Al2Cu相均匀分布在α-Al基体中，形成较大的晶界相，形成无析出区。复合材料的腐蚀主要表现为点蚀和晶间腐蚀。点蚀主要发生在TiB2陶瓷颗粒周围的α-Al基体和θ相。在TiB2陶瓷颗粒的存在下形成了双电极耦合体系，这解释了α-Al基体腐蚀降低的机理。

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Corrosion behavior of AlZnMgCu/TiB2 composites prepared via the in-situ generation of TiB2

AlZnMgCu/TiB₂ composites are prepared via the in-situ generation of TiB₂ ceramic particles and subjected to hot extrusion and heat-treatment. XRD, SEM, EDS and TEM are used to characterize the composition, lattice structure and distribution of the secondary phases. The corrosion behavior of the composites is studied by electrochemical impedance spectroscopy, potential polarization measurements and corrosion morphology analysis. The effects of MgZn₂ and Al₂Cu precipitated phases and TiB₂ ceramic particles on the corrosion behavior are discussed. The results show that the TiB₂ ceramic particles are distributed along the extrusion direction and grain boundaries. Nano-sized MgZn₂ and Al₂Cu precipitates are evenly distributed in the α-Al matrix and form large grain boundary precipitates, resulting in precipitation-free zones. The corrosion of the composites is mainly pitting and intergranular corrosion. The pitting corrosion occurs in the α-Al matrix around TiB₂ ceramic particles and the θ phase. Two-electrode coupling systems are formed in the presence of TiB₂ ceramic particles, which explain the mechanism behind the reduced corrosion of the α-Al matrix.

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.