AZ31镁合金表面激光熔覆Al-TiC复合涂层微观组织与腐蚀性能

刘奋军; 宁祥; 白艳霞; 申志康; 陈海燕

doi:10.13801/j.cnki.fhclxb.20220410.002

AZ31镁合金表面激光熔覆Al-TiC复合涂层微观组织与腐蚀性能

doi: 10.13801/j.cnki.fhclxb.20220410.002

刘奋军^{1, 2},
宁祥³,
白艳霞³,
申志康⁴,
陈海燕^4, ,

1.
榆林学院　能源工程学院，榆林 719000
2.
榆林学院　榆林市金属基复合材料与再制造技术重点实验室，榆林 719000
3.
榆林学院　化学与化工学院，榆林 719000
4.
西北工业大学　材料学院，西安 710072

基金项目: 国家自然科学基金(51861034；51974260)；榆林市科技局产学研项目(CXY-2022-083；CXY-2020-006-01)；榆林高新区科技创新局产学研项目(CXY-2021-16)；榆林学院高层次人才项目(20 GK06)；中国科学院洁净能源创新研究院-榆林学院联合基金项目(YLU-DNL Fund 2021008)；陕西省教育厅创新团队项目(22JP105)

详细信息

通讯作者:
陈海燕，博士，副教授，博士生导师，研究方向为激光复合钎焊的超精密连接及复合材料制备等　E-mail：hychen@nwpu.edu.cn

中图分类号: TB331
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出版历程
- 收稿日期: 2022-02-11
- 修回日期: 2022-03-28
- 录用日期: 2022-03-29
- 网络出版日期: 2022-04-12
- 刊出日期: 2023-02-15

Microstructure and corrosion properties of the laser cladding Al-TiC composite coating on AZ31 magnesium alloy

1.
College of Energy Engineering, Yulin University, Yulin 719000, China
2.
Yulin Key Laboratory of Metal Matrix Composites and Remanufacturing Technology, Yulin University, Yulin 719000, China
3.
School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China
4.
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi′an 710072, China

Funds: National Natural Science Foundation of China (51861034; 51974260); Technology Bureau of Yulin (CXY-2022-083; CXY-2020-006-01); Technology Bureau of Yulin High-tech Zone (CXY-2021-16); High-level Talent Project of Yulin University (20 GK06); Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (YLU-DNL Fund 2021008); Innovation Team of Education Department of Shaanxi Provincial Government (22JP105)

摘要

摘要: 为有效改善AZ31镁合金表面的腐蚀性能，本文采用激光熔覆技术在AZ31镁合金表面成功制备了无缺陷的Al-TiC复合涂层。研究了不同成分含量的Al-TiC复合涂层的相组成、微观组织和耐腐蚀性能的影响。结果表明：在Al-TiC复合涂层内形成了大量的Al₁₂Mg₁₇、Mg₂Al₃和TiC相。复合涂层内微观组织呈现出连续网络状分布特征。随着Al-TiC混合粉末中Al含量的减小，复合涂层中Al₁₂Mg₁₇、Mg₂Al₃和TiC相的含量呈递增趋势，网络状分布的微观组织结构变得更加均匀连续。复合涂层与AZ31基体之间形成了良好的冶金结合界面。激光熔覆制备的Al-TiC复合涂层耐腐蚀性能较AZ31基体显著提升。自腐蚀电位由基体的−1.563 V提升至−1.144 V，自腐蚀电流由基体的1.55×10⁻⁴ A减小至2.63×10⁻⁶ A。
- 激光熔覆 /
- Al-TiC复合涂层 /
- AZ31合金 /
- 微观组织 /
- 耐腐蚀性
Abstract: In order to enhance the surface corrosion resistance of the AZ31 magnesium alloy, the defect-free Al-TiC composite coatings were prepared on AZ31 magnesium alloy using laser cladding technology. The influences of Al-TiC compositions with different contents on the phase composition, microstructure and corrosion resistance of the Al-TiC composite coatings were investigated. The results indicate that a large number of Al₁₂Mg₁₇, Mg₂Al₃ and TiC phases are produced in the Al-TiC composite coating. The microstructure of the composite coating characterizes as a continuous network distribution. With the decrease of the Al content in the composite powder, the contents of the Al₁₂Mg₁₇, Mg₂Al₃ and TiC phases in the composite coating gradually increase, and the network-like distribution characteristics of the microstructure in the composite coating become more uniform and continuous. In addition, a sound metallurgical bonding interface is prepared between the composite coating and the AZ31 substrate. The corrosion resistance of the Al-TiC composite coating prepared using the laser cladding technology is significantly enhanced compared to that of the AZ31 substrate. The self-corrosion potential increased from −1.563 V of the AZ31 substrate to −1.144 V of the Al-TiC composite coating, whereas the self-corrosion current decreased from 1.55×10⁻⁴ A to 2.63×10⁻⁶ A.
- laser cladding /
- Al-TiC composite coating /
- AZ31 alloy /
- microstructure /
- corrosion resistance

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图 1 Al粉和TiC粉的SEM图像

Figure 1. SEM images of Al and TiC

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图 2 AZ31和Al-TiC复合涂层XRD图谱

Figure 2. XRD patterns of AZ31 and Al-TiC composite coatings

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图 3 Al-TiC复合涂层表面 ((a)~(c)) 及横截面 ((d)~(f)) 宏观成型

Figure 3. Surface ((a)-(c)) and cross-sectional ((d)-(f)) morphologies of Al-TiC composite coatings

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图 4 Al-TiC复合涂层结合界面 ((a)~(c)) 及微观组织 ((d)~(f))

A, B—Test point

Figure 4. Bonding interface ((a)-(c)) and microstructure ((d)-(f)) of Al-TiC composite coatings

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图 5 Al-TiC复合涂层微观组织

Figure 5. Microstructures of the Al-TiC composite coatings

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图 6 Al-TiC复合涂层(Al-5TiC)元素分布

Figure 6. Elemental mappings of Al-TiC composite coatings (Al-5TiC)

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图 8 Al-TiC复合涂层(Al-20TiC)元素分布

Figure 8. Elemental mappings of Al-TiC composite coatings (Al-20TiC)

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图 7 Al-TiC复合涂层(Al-10TiC)元素分布

Figure 7. Elemental mappings of Al-TiC composite coatings (Al-10TiC)

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图 9 AZ31和Al-TiC复合涂层耐腐蚀性能

Figure 9. Corrosion resistance of AZ31 and Al-TiC composite coatings

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图 10 AZ31和Al-TiC复合涂层的EIS等效电路图

R_s—Solution resistance; CPE_f—Al-TiC composite coating capacitance; R_f—Al-TiC composite coating resistance; CPE_dl—Electric double layer capacitor; R_ct—Charge transfer resistance; L—Inductance; R_L—Inductor resistance

Figure 10. EIS equivalent circuit diagram of AZ31 and Al-TiC composite coatings

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图 11 AZ31和Al-TiC复合涂层表面腐蚀形貌

Figure 11. Corrosion morphologies of AZ31 and Al-TiC composite coatings

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表 1 Al-TiC复合涂层具体粉末配比

Table 1. Specific ratios of the Al-TiC composite coatings

Sample	Powders and powder ratio
Sample	Al/wt%	TiC/wt%
Al-5TiC	95	5
Al-10TiC	90	10
Al-20TiC	80	20

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表 2 A点和B点的EDS测试结果

Table 2. EDS analysis of point A and point B

Point	Mg/at%	Al/at%	Zn/at%	TiC/at%	C/at%
A	38.32	32.43	0.80	2.48	25.96
B	47.97	33.04	0.85	0.09	18.05

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表 3 AZ31和Al-TiC复合涂层的自腐蚀电位和自腐蚀电流

Table 3. Self-corrosion potential and self-corrosion current of the AZ31 and Al-TiC composite coatings

Sample	Self-corrosion potential/V	Self-corrosion current/A
AZ31	−1.563	1.55×10⁻⁴
Al-5TiC	−1.381	2.30×10⁻⁴
Al-10TiC	−1.195	7.55×10⁻⁵
Al-20TiC	−1.144	2.63×10⁻⁶

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表 4 等效电路模型拟合的电化学参数

Table 4. Electrochemical parameters fitted by the equivalent circuit model

Parameter	R_s/(Ω·cm²)	CPE_f/(Ω·cm²·Sⁿ)	n_f	R_f/(Ω·cm²)	CPE_dl/(Ω·cm²·Sⁿ)	n_dl	R_ct/(Ω·cm²)	L/(H·cm²)	R_L/(Ω·cm²)
AZ31	16.50	–	–	–	7.69×10⁻⁶	0.91	27.6	13.46	10.29
Al-5TiC	16.99	7.38×10⁻⁶	0.95	118.5	4.36×10⁻⁶	0.89	452.2	–	–
Al-10TiC	15.96	3.04×10⁻⁵	0.76	506.5	3.22×10⁻⁵	0.85	416.3	–	–
Al-20TiC	16.47	1.83×10⁻⁵	0.87	1045.0	1.01×10⁻⁴	0.68	774.8	–	–
Notes: n_f—CPE_f index; n_dl—CPE_dl index.

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