HE Qiong*.Effect of Tartaric Acid Anodizing and Sealing on Corrosion Resistance of Architectural Aluminum Alloy[J].Plating & Finishing,2021,(9):19-24.[doi:10.3969/j.issn.1001-3849.2021.09.004]
酒石酸阳极氧化及封闭对建筑铝合金耐蚀性能的影响
- Title:
- Effect of Tartaric Acid Anodizing and Sealing on Corrosion Resistance of Architectural Aluminum Alloy
- 文献标志码:
- A
- 摘要:
- 选取在建筑领域常用的6463铝合金作为研究对象，为使其耐蚀性能得到显著提高，进行酒石酸阳极氧化然后采用镍盐封闭，同时进行硫酸阳极氧化及镍盐封闭作为对比。表征和测试了酒石酸氧化膜、硫酸氧化膜的显微形貌、成分和耐蚀性能，并研究了封闭对酒石酸氧化膜和硫酸氧化膜的影响。结果表明，Ni元素通过封闭被引入氧化膜中，封闭后硫酸氧化膜和封闭后酒石酸氧化膜都含有Al、O、S、Ni四种元素。封闭后酒石酸氧化膜和硫酸氧化膜都呈现“花瓣状形貌”，且明显不同于铝合金的显微形貌。封闭使得氧化膜的腐蚀电位明显正移，极化电阻提高到接近104 Ω·cm2数量级，腐蚀速率明显降低。相比于封闭后硫酸氧化膜，封闭后酒石酸氧化膜表面更均匀致密，具有优良的耐蚀性能，对铝合金的防护性能更好。
- Abstract:
- In order to greatly improve the corrosion resistance of 6463 aluminum alloy which was commonly used in architectural field, the aluminum alloy was anodized with tartaric acid-sulfuric acid electrolyte and then sealed with nickel salt. At the same time, the aluminum alloy was anodized with sulfuric acid and then sealed with nickel salt as comparison. The microstructure, components and corrosion resistance of tartaric acid oxidation film and sulfuric acid oxidation film were characterized and tested, and the influence of sealing on tartaric acid oxidation film and sulfuric acid oxidation film was investigated. The results show that Ni element is introduced into the oxide film by sealing, so that the sealed tartaric acid oxide film and sealed sulfuric acid oxidation film contain four elements of Al, O, S and Ni. Both the sealed tartaric acid oxide film and sealed sulfuric acid oxidation film show "petal-like morphology" and are different from that of aluminum alloy. Sealing makes the corrosion potential of the oxide film move forward obviously, the polarization resistance increases to the order of 104 Ω·cm2, and the corrosion rate decreases significantly. Compared with the sealed sulfuric acid oxidation film, the surface of sealed tartaric acid oxidation film is more uniform and compact, has excellent corrosion resistance, and appears better corrosion protection for aluminum alloy.
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备注/Memo
收稿日期： 2021-01-15；修回日期： 2021-02-25
作者简介： 何琼（1981－），女，硕士，讲师，email：education_he21@163.com
基金项目： 国家自然科学基金（61852067）