Ling Fuping *.Effect of phytic acid and sealing treatment with cerium salt solution on properties of anodic oxidation films on aluminum-lithium alloy[J].Plating & Finishing,2023,(3):32-38.[doi:10.3969/j.issn.1001-3849.2023.03.005]
植酸及铈盐溶液封闭对铝锂合金阳极氧化膜性能的影响
- Title:
- Effect of phytic acid and sealing treatment with cerium salt solution on properties of anodic oxidation films on aluminum-lithium alloy
- Keywords:
- aluminum-lithium alloy ; anodic oxidation film ; phytic acid ; sealing treatment with cerium salt solution ; hardness ; corrosion resistance
- 分类号:
- TQ153.6
- 文献标志码:
- A
- 摘要:
- 选用 2099 铝锂合金作为基体，制备阳极氧化膜，研究了电解液中植酸体积分数对阳极氧化膜的微观形貌、成分、厚度、硬度、耐磨性和耐蚀性能的影响。结果表明：添加适量植酸后，促使形成较平整、结构致密的阳极氧化膜，并使阳极氧化膜的厚度增加，抵御弹塑性变形能力和阻碍电化学腐蚀能力增强，因此硬度和耐蚀性能提高。而过量植酸的添加，导致阳极氧化膜表面疏松，厚度和硬度都降低， 耐蚀性能随之下降。当电解液中植酸体积分数为 5 mL/L 时，制备的阳极氧化膜表面平整且结构致密，其厚度为 14.2 μ m ，硬度达到 360.5 HV ，电荷转移电阻与不添加植酸时制备的阳极氧化膜相比提高约 1.58×10 3 Ω ·cm 2 ，表现出优良的耐蚀性能。该阳极氧化膜经铈盐溶液封闭后平整度和致密性明显改善，成分除了 4 种元素 Al 、 O 、 C 和 P 外，还含有 Ce 元素。封闭过程中反应产物的填补作用与覆盖封闭作用叠加，使铈盐封闭后阳极氧化膜的耐蚀性能更好，表现出优良的耐磨性能。
- Abstract:
- ： The anodic oxidation films were prepared on 2099 aluminum-lithium alloy matrix ， and the effects of the volume fraction of phytic acid in the electrolyte on the microstructure ， composition ， thickness ， hardness ， wear resistance and corrosion resistance of the anodic oxidation films were s tudied. The results showed that when the phytic acid was added ， the anodic oxide film with relatively flat and dense structure was formed ， and the thickness of the anodic oxide film was increased. The ability to resist elastic-plastic deformation and hinder electrochemical corrosion was enhanced ， so the hardness and corrosion resistance were improved. However ， adding excessive phytic acid would lead to the loose anodic oxidation film ， the thickness and hardness were reduced ， and the corrosion resistance was weakened. When the volume fraction of phytic acid added in the electrolyte was 5 mL/L ， the anodic oxide film was smooth and compact with thickness of 14.2 μ m and hardness up to 360.5 HV. The charge transfer resistance was increased by about 1.58×10 3 Ω ·cm 2 compared with the anodic oxidation film prepared without adding phytic acid ， showing excellent corrosion resistance. The flatness and compactness of the anodic oxidation film were obviously improved after being sealing treatment with cerium salt solution ， and the composition included four elements of Al ， O ， C and P ， and also contained Ce element. The filling effect of the reaction products generated in sealing process was superimposed with the covering effect ， so that the corrosion resistance of the anodic oxidation film after sealing treatment with cerium salt solution was better ， exhibiting excellent wear resistance.
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备注/Memo
收稿日期： 2022-08-21 修回日期： 2022-09-22 通信作者： 凌付平（ 1983 —），男，硕士，高级实验师，高级工程师， email ： teacher_ling88@126.com 基金项目： 南通市科技计划项目（ MSZ21011 ）