Preparation and properties of Mg-Nd binary alloy MAO/SiO2@α-Fe2O3 organic composite coating

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-05-23 DOI:10.1038/s41529-024-00473-7

Qiang Sun, Quantong Jiang, Siwei Wu, Chang Liu, Heng Tang, Hao Shi, Liying Song, Jizhou Duan, Baorong Hou

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Abstract

In order to make magnesium alloys better used in aviation, electronic information and other fields, it is necessary to improve their corrosion resistance and wave absorption properties. In this paper, a composite coating with corrosion resistance and wave absorption properties was prepared on magnesium alloy by micro-arc oxidation-organic coating technology. An organic absorbing coating with a thickness of about 40 μm was sprayed on the MAO coating containing Yb2O3 nanoparticles. Among them, the absorbing fillers in the organic coating are mainly SiO2 and α-Fe2O3. Three different mass ratios of SiO2 and α-Fe2O3 were set to 20%, 22.5% and 25%, respectively, to prepare three different MAO/SiO2@α-Fe2O3 organic composite coatings. The morphology, roughness, microstructure and chemical composition of the organic composite coating are characterized. The results show that after coating the organic composite coating, the roughness of the coating is significantly reduced, and the compactness and interlayer adhesion of the coating are significantly improved. The electrochemical test and SKPFM test of the organic composite coating were carried out. The results showed that with the increase of the mass ratio of SiO2 and α-Fe2O3, the corrosion resistance and stability of the organic composite coating increased, and the Volta potential also gradually moved up. The microwave absorbing properties of organic composite coatings were studied by vector network analyzer. The results show that the microwave absorbing properties of the coatings are positively correlated with the mass ratio of SiO2 and α-Fe2O3.

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镁钕二元合金 MAO/SiO2@α-Fe2O3 有机复合涂层的制备与性能

为了使镁合金更好地应用于航空、电子信息等领域，必须提高其耐腐蚀性和吸波性能。本文采用微弧氧化-有机涂层技术在镁合金上制备了具有耐腐蚀性和吸波性能的复合涂层。在含有 Yb2O3 纳米颗粒的 MAO 涂层上喷涂了厚度约为 40 μm 的有机吸波涂层。其中，有机涂层中的吸收填料主要是 SiO2 和 α-Fe2O3。将 SiO2 和 α-Fe2O3 的质量比分别设定为 20%、22.5% 和 25%，制备出三种不同的 MAO/SiO2@α-Fe2O3 有机复合涂层。对有机复合涂层的形貌、粗糙度、微观结构和化学成分进行了表征。结果表明，涂覆有机复合涂层后，涂层的粗糙度明显降低，涂层的致密性和层间附着力明显提高。对有机复合涂层进行了电化学测试和 SKPFM 测试。结果表明，随着 SiO2 和 α-Fe2O3 质量比的增加，有机复合涂层的耐腐蚀性和稳定性提高，伏特电位也逐渐升高。利用矢量网络分析仪研究了有机复合涂层的微波吸收特性。结果表明，涂层的微波吸收特性与 SiO2 和 α-Fe2O3 的质量比呈正相关。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies