氧化膏处理对2024-T3铝合金表面性能的影响

张琪; 李卫平; 王新坤; 冯剑波; 刘慧丛; 朱立群

doi:10.13700/j.bh.1001-5965.2016.0728

氧化膏处理对2024-T3铝合金表面性能的影响

doi: 10.13700/j.bh.1001-5965.2016.0728

张琪¹,
李卫平¹,
王新坤^{1, 2, ,},
冯剑波¹,
刘慧丛¹,
朱立群¹

1.
北京航空航天大学材料科学与工程学院, 北京 100083
2.
北京航空工程技术研究中心, 北京 100076

基金项目:

国家自然科学基金 51371020

详细信息

作者简介:
张琪女, 硕士研究生; 主要研究方向:铝合金的化学氧化和阳极氧化

王新坤男, 硕士, 高级工程师; 主要研究方向:材料的腐蚀与防护

通讯作者:
王新坤, E-mail:wangxinkun1010@163.com

中图分类号: V261.93;TG146.2
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- 文章访问数: 707
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- 被引次数: 0
出版历程
- 收稿日期: 2016-09-12
- 录用日期: 2017-01-07
- 网络出版日期: 2017-09-20

Influence on surface performance of 2024-T3 aluminum alloy processed with oxidising paste

1.
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
2.
Beijing Aeronautical Technology Research Center, Beijing 100076, China

Funds:

National Natural Science Foundation of China 51371020

More Information

Corresponding author: WANG Xinkun, E-mail:wangxinkun1010@163.com

摘要

摘要:
针对铝合金蒙皮表面涂层修复对基材局部现场氧化处理的需求，研究了膏状氧化材料的调制方法，并探讨了氧化膏在2024-T3铝合金表面的成膜性能。通过扫描电镜、能谱、体视显微镜、点滴、电化学、接触角测试以及拉伸剪切实验考察了氧化膜的形貌和组成、耐蚀性能及粘接性能。实验表明，室温下铝合金表面经氧化膏处理后可快速生成氧化膜，膜层具有一定的微观孔洞结构，主要包含Al、F、Cr、O等元素；膜层耐蚀性与阿洛丁氧化液处理效果相近，与未氧化试样相比腐蚀电压由-0.898 V升至-0.880 V，腐蚀电流密度由2.582×10^-5 A/cm²降至3.334×10^-7 A/cm²，阻抗值由1.556×10³Ω/cm²增至1.347×10⁵ Ω/cm²；表面自由能和粘附功分别由32.7 mJ/cm²和36.3 mJ提高到55.7 mJ/cm²和109.7 mJ，拉伸剪切强度由11.7 MPa提升为15.0 MPa，结果表明氧化膜的形貌和组成有助于获得更好的界面结合力并改善基材的粘接性能。
- 氧化膏 /
- 2024-T3铝合金 /
- 氧化膜 /
- 耐蚀性能 /
- 粘接性能
Abstract:
Oxidising paste was prepared for in-situ local oxidation treatment of coatings on aluminum alloy skin surface and its film-forming performance on 2024-T3 aluminum alloy was studied. Morphology and chemical composition, corrosion resistance, and adhesive performance of the oxidation film were investigated by SEM, EDS, stereomicroscope, drop test, electrochemistry test, contact angle and tension loading method. The results show that oxidation film can be obtained rapidly on aluminum alloy surface after treated by oxidising paste, and the film has microscopic pore structure, including Al, F, Cr, O, etc. Corrosion resistance of the film is similar to that gained by Alodine solution. Compared to the bare sample, corrosion potential increases from -0.898 V to -0.880 V, corrosion current density decreases from 2.582×10^-5 A/cm² to 3.334×10^-7 A/cm², and impedance improves from 1.556×10³ Ω/cm² to 1.347×10⁵ Ω/cm². Surface free energy and the work of adhesion rise from 32.7 mJ/cm² and 36.3 mJ to 55.7 mJ/cm² and 109.7 mJ, respectively. Strength properties of adhesive in shear is promoted from 11.7 MPa to 15.0 MPa. The results indicate that morphology and chemical composition of the oxidation film can enhance interface bonding strength and adhesive performance.
- oxidising paste /
- 2024-T3 aluminum alloy /
- oxidation film /
- corrosion resistance /
- adhesive performance

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图 1 不同含量调节剂(A/B)下的氧化膏涂覆在垂直试样表面的状态

Figure 1. Oxidising paste with different content of modifier (A/B) on surface of vertically placed samples

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图 2 3种处理试样表面的SEM照片及对应区域的EDS谱图

Figure 2. SEM photographs and EDS spectra in corresponding areas on samples' surface under three different treatments

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图 3 不同处理试样的点滴测试结果

Figure 3. Drop test results of samples with different treatments

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图 4 点滴测试前后试样的表面形貌

Figure 4. Surface topography of samples before and after drop test

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图 5 不同处理试样的极化曲线

Figure 5. Tafel curves of samples with different treatments

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图 6 试样的E_corr及j_corr的变化范围

Figure 6. Variation range of E_corr and j_corr of samples

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图 7 不同处理试样的交流阻抗图

Figure 7. AC impedance diagrams for samples with different treatments

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图 8 等效电路图

Figure 8. Equivalent electrical circuit diagrams

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图 9 不同处理试样的表面形貌及相应位置液滴的形状

Figure 9. Surface topography of samples with different treatments and shape of drops on surface

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图 10 测试试样的形状、尺寸及剪切面形貌

Figure 10. Shape, size and shear plane morphology of test samples

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表 1 氧化膏的成分

Table 1. Composition of oxidising paste

组分	三氧化铬	氟化氢铵	磷酸氢二胺	硼酸	调节剂A	调节剂B
质量分数/%	10~12	1~2	1~2	1	45~55	30~40

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表 2 3种不同处理下试样的表面元素

Table 2. Surface elements of samples with three different treatments

处理方式	表面元素
未氧化	Al，Cu，Mg
氧化液	Al，Cu，Mg，O，F，Cr，
氧化膏	Al，Cu，Mg，O，F，Cr，P

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表 3 Tafel曲线的电化学参数

Table 3. Electrochemical parameters of Tafel curves

处理方式	E_corr/V(versus SCE)	j_corr/(A·cm^-2)	η/%
未氧化	-0.898	2.582×10^-5
氧化液	-0.904	3.491×10^-7	98.6
氧化膏	-0.880	3.334×10^-7	98.7

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表 4 不同处理试样的电化学参数

Table 4. Electrochemical parameters of samples with different treatments

处理方式	R_s/(Ω·cm^-2)	C_coat/(μF·cm^-2)	R_coat/(Ω·cm^-2)	C_dl/(μF·cm^-2)	R_ct/(Ω·cm^-2)
未氧化	1.557	1.214×10^-6	7.17	1.483×10^-5	1.556×10³
氧化液	1.544	7.420×10^-7	11.71	3.879×10^-6	6.103×10⁴
氧化膏	1.947	6.619×10^-7	6.936	4.557×10^-6	1.347×10⁵

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表 5 试样的接触角、表面自由能及粘附功

Table 5. Water contact angel, surface free energy and work of adhesion of samples

处理方式	θ/(°)	γ/(mJ·cm^-2)	W_A/mJ
未氧化	83.7	32.7	36.3
氧化液	54.5	41.6	65.7
氧化膏	14.4	55.7	109.7

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表 6 金属搭接的胶粘剂拉伸剪切强度

Table 6. Strength properties of adhesive in shear by tension loading(metal to metal)

处理方式	P/N	B/mm	L/mm	τ/MPa
无氧化	3 500	25	12	11.7
氧化液	3 600	25	12.0	12.0
氧化膏	4 500	25	12	15.0

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