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Investigation of Anodic Film on a Novel RE-containing Al-Alloy Al-Zn-Mg-Cu-Sc |
WANG Yingjun1, LIU Honglei1, WANG Guojun1, DONG Kaihui2, SONG Yingwei2(), NI Dingrui2 |
1 Northeast Light Alloy CO. , LTD, Harbin 150060, China 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract A novel anodic process was developed for a RE-containing 7000 series Al-alloy Al-Zn-Mg-Cu-Sc. Further, sealing-pore post treatments were carried out to improve the compactness of the anodic film. The results indicate that the precipitated Sc-containing phases on the surface of 7000 series Al-alloy act as micocathodes to accelerate the corrosion of Al matrix, which has a negative effect on the uniformity of the anodic film. In order to solve this trouble, the formula and electric parameters of the electrolyte bath were adjusted, hence, a uniform and smooth anodic film is formed on the surface of the Al-alloy. Meantime, three sealing-pore processes with fluozirconate, cerate and boiling water respectively were carried out to improve the compactness of the anodic film. It is found that after boiling water sealing-pore, the anodic film exhibits a sliver like uniform surface without defects and microcracks, among others, that film presents the best corrosion resistance, and the film can keep intact after salt spray test for 336 h, which can satisfy the requirement for the actual applications.
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Received: 09 January 2020
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Fund: National Key R&D Program of China(2016YFB0301105) |
Corresponding Authors:
SONG Yingwei
E-mail: ywsong@imr.ac.cn
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[1] |
Wang J, Huang S, Huang H J, et al. Effect of micro-groove on microstructure and performance of MAO ceramic coating fabricated on the surface of aluminum alloy [J]. J. Alloy. Compd., 2019, 777: 94
|
[2] |
Leng L, Zhang Z J, Duan Q Q, et al. Improving the fatigue strength of 7075 alloy through aging [J]. Mater. Sci. Eng., 2018, A738: 24
|
[3] |
Reda Y, Abdel-Karim R, Elmahallawi I. Improvements in mechanical and stress corrosion cracking properties in Al-alloy 7075 via retrogression and reaging [J]. Mater. Sci. Eng., 2008, A485: 468
|
[4] |
Yang Q X, Ren S S, Zhao Q Q, et al. Surface grafting modification and wetting behavior of anodic aluminum oxide film [J]. Surf. Technol., 2017, 46(5): 184
|
|
(杨清香, 任爽爽, 赵倩倩, 等. 阳极氧化铝膜的表面接枝改性及润湿行为 [J]. 表面技术, 2017, 46(5): 184)
|
[5] |
Shih H H, Tzou S L. Study of anodic oxidation of aluminum in mixed acid using a pulsed current [J]. Surf. Coat. Technol., 2000, 124: 278
|
[6] |
Zhang J S, Zhao X H, Zuo Y, et al. The bonding strength and corrosion resistance of aluminum alloy by anodizing treatment in a phosphoric acid modified boric acid/sulfuric acid bath [J]. Surf. Coat. Technol., 2008, 202: 3149
|
[7] |
Dai Y F, Shen S T, Lu J Q, et al. 2024 aluminum alloy anodic oxidation in mixed acid [J]. Surf. Technol., 2018, 47(1): 198
|
|
(戴一帆, 沈士泰, 卢洁琴等. 2024铝合金混合酸阳极氧化 [J]. 表面技术, 2018, 47(1): 198)
|
[8] |
Deng Y, Yin Z M, Zhao K, et al. Effects of Sc and Zr microalloying additions and aging time at 120 ℃ on the corrosion behaviour of an Al-Zn-Mg alloy [J]. Corros. Sci., 2012, 65: 288
|
[9] |
Rokhlin L L, Dobatkina T V, Bochvar N R, et al. Investigation of phase equilibria in alloys of the Al-Zn-Mg-Cu-Zr-Sc system [J]. J. Alloy. Compd., 2004, 367: 10
|
[10] |
Zou X L, Yan H, Chen X H. Evolution of second phases and mechanical properties of 7075 Al alloy processed by solution heat treatment [J]. Trans. Nonferrous Met. Soc. China, 2017, 27: 2146
|
[11] |
Zhu Z F. Surface Treatment of Aluminum [M]. Changsha: Central South University Press, 2010
|
|
(朱祖芳. 铝材表面处理 [M]. 长沙: 中南大学出版社, 2010)
|
[12] |
Liu D Q, Ke L M, Xu W P, et al. Intergranular corrosion behavior of friction-stir welding joint for 20 mm thick plate of 7075 Al-alloy [J]. J. Chin. Soc. Corros. Prot., 2017, 37(3): 293
|
|
(刘德强, 柯黎明, 徐卫平等. 7075厚板铝合金搅拌摩擦焊接头晶间腐蚀行为研究 [J]. 中国腐蚀与防护学报, 2017, 37(3): 293)
|
[13] |
Zhang R F, Li J F, Li Q, et al. Analysing the degree of sensitisation in 5xxx series aluminium alloys using artificial neural networks: A tool for alloy design [J]. Corros. Sci., 2019, 150: 268
|
[14] |
Zhu R Z. Corrosion of Metals [M]. Beijing: Metallurgical Industry Press, 1989
|
|
(朱日彰. 金属腐蚀学 [M]. 北京: 冶金工业出版社, 1989)
|
[15] |
Song Y W, Shan D Y, Han E-H. Pitting corrosion of a rare earth Mg alloy GW93 [J]. J. Mater. Sci. Technol., 2017, 33: 954
|
[16] |
Zhuang J J, Song R G, Xiang N, et al. Corrosion behavior of micro-arc oxidation coatings formed on 6063 aluminum alloy [J]. Corros. Sci. Prot. Technol., 2017, 29: 492
|
|
(庄俊杰, 宋仁国, 项南等. 6063铝合金微弧氧化膜层的腐蚀行为研究 [J]. 腐蚀科学与防护技术, 2017, 29: 492)
|
[17] |
Tian L P, Zuo Y, Zhao J M, et al. Evaluation of sealing methods on corrosion behavior of LD7 aluminum alloy anodic oxide films in NaCl solution [J]. J. Chin. Soc. Corros. Prot., 2005, 25: 327
|
|
(田连朋, 左禹, 赵景茂等. LD7铝合金阳极氧化膜的不同封闭方法耐蚀性评价 [J]. 中国腐蚀与防护学报, 2005, 25: 327)
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