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 )