阴极脉冲方波对Na2C4H4O6-KF-Na2SiO3体系制备AZ91D镁合金PEO涂层组织及耐蚀性的影响

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Engineering, Science and Technology Pub Date : 2022-09-07 DOI:10.1080/1478422X.2022.2118439

Lingfei Meng, Wei Zhang, Song Zhang, Jifu Zhang, Chun-hua Zhang, Y. Ye, Z. Bao, Fu-hui Wang

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引用次数: 0

摘要

摘要在Na2C4H4O6–KF–Na2SiO3体系中，通过分别控制单脉冲方波和双极脉冲方波，在AZ91D镁合金上形成了等离子体电解氧化涂层。采用电位动态极化（PD）、电化学阻抗谱（EIS）和电化学噪声测量（EN）研究了它们在3.5%NaCl溶液中的腐蚀行为。结果表明，采用双极脉冲模式进行PEO工艺时，镁合金表面PEO涂层的生长速度首先下降，涂层内部出现了一些微孔。随着氧化时间的增加，PEO涂层变得更加均匀，涂层的孔隙率大大降低，并且PEO涂层的耐腐蚀性增强。双极脉冲模式的使用有利于改善PEO处理镁合金的致密性和腐蚀性能，以获得更高的电压级和更长的氧化时间。

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Effect of cathode pulse square-wave on the microstructure and corrosion resistance of PEO coatings of AZ91D magnesium alloy prepared in the Na2C4H4O6–KF–Na2SiO3 system

ABSTRACT Plasma electrolytic oxidation coatings were formed in Na2C4H4O6–KF–Na2SiO3 system on AZ91D magnesium alloy by controlling the single-pulse square-wave and bipolar pulse square-wave, respectively. Potentiodynamic polarisation (PD), electrochemical impedance spectroscopy (EIS) and electrochemical noise measurement (EN) were employed to investigate their corrosion behaviour in 3.5% NaCl solution. The results show that with bipolar pulse mode for PEO process, the growth rate of PEO coating on magnesium alloy first decreased and some micropores were present inside the PEO coating. With the increasing oxidation time, the PEO coating became much homogeneous and the porosity of the coating decreased largely, and the corrosion resistance of PEO coating was enhanced. The use of the bipolar pulse mode is beneficial to the improvement of the compactness and corrision performance of magnesium alloy with PEO treatment for the higher voltage stage and longer oxidation time.

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.