Influence of oxalic additive on etidronic acid anodizing of aluminum alloy

IF 4.5 3区化学 Q1 Chemical Engineering Journal of Electroanalytical Chemistry Pub Date : 2023-09-01 DOI:10.1016/j.jelechem.2023.117641

Manxi Sun , Hongjian Huang , Meilin Jiang , Li Cheng , Lin Dong

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Abstract

The anodizing in etidronic acid (HEDP) and oxalic acid (H₂C₂O₄) mixed electrolytes was conducted. The anodizing parameters were optimized based on the evaluation of energy consumption, growth efficiency, and hardness of PAA film. The results indicate that continuous and uniform PAA films can be fabricated in HEDP/H₂C₂O₄ solutions in any proportion, and both the anodizing voltages and roughnesses of PAA films decreased with the H₂C₂O₄ content. The moderate amount of H₂C₂O₄ could lead to an increase in the formation efficiency of PAA films. The hardness of the PAA film prepared in HEDP/H₂C₂O₄ electrolyte could reach up to ∼660 HV. Moreover, a surface resembling lotus leaves could be formed due to the corrosion of PAA films with sub-micron interpore distance by H₂C₂O₄ during anodizing, and a superhydrophobic surface with a contact angle of ∼153° could be obtained after it was modified via stearic acid.

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草酸添加剂对铝合金依地膦酸阳极氧化的影响

在乙酸(HEDP)和草酸(H2C2O4)混合电解质中进行阳极氧化。通过对能耗、生长效率和PAA膜硬度的评价，对阳极氧化工艺参数进行了优化。结果表明:在HEDP/H2C2O4溶液中，以任意比例均可制备连续均匀的PAA膜，且阳极氧化电压和PAA膜的粗糙度随H2C2O4含量的增加而减小;适量的H2C2O4可以提高PAA膜的形成效率。在HEDP/H2C2O4电解液中制备的PAA膜的硬度可达~ 660 HV。此外，在阳极氧化过程中，由于孔间距离为亚微米的PAA膜被H2C2O4腐蚀，可以形成类似于莲叶的表面，并且通过硬脂酸修饰后可以获得接触角为~ 153°的超疏水表面。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.