Effect of Nb Content on Microstructure and Corrosion Resistance of Al⁃15Si⁃xNb Coating

doi:10.12422/j.issn.1672-6952.2023.01.009

Journal of Liaoning Petrochemical University ›› 2023, Vol. 43 ›› Issue (1): 49-53.DOI: 10.12422/j.issn.1672-6952.2023.01.009

• Mechanical Engineering • Previous Articles Next Articles

Effect of Nb Content on Microstructure and Corrosion Resistance of Al⁃15Si⁃xNb Coating

Xianmin Peng¹(), Cheng Lin¹(), Lili Guo², Yanhua Shi¹, Zhongli Qiao¹, Libin Lin¹

^1.School of Mechanical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China
^2.Jinzhou Jinheng Safety System of Automotive Co. ，Ltd. ，Jinzhou Liaoning 121007，China

Received:2021-11-29 Revised:2022-02-24 Published:2023-02-25 Online:2023-03-13
Contact: Cheng Lin

Nb质量分数对Al⁃15Si⁃xNb涂层组织与耐蚀性能的影响

彭贤民¹(), 林成¹(), 郭丽丽², 史艳华¹, 乔忠立¹, 林丽彬¹

^1.辽宁石油化工大学机械工程学院，辽宁抚顺 113001
^2.锦州锦恒汽车安全系统股份有限公司，辽宁锦州 121007

通讯作者: 林成
作者简介:彭贤民（1994⁃），男，硕士研究生，从事材料增材制造等方面的研究；E⁃mail：876797363@qq.com。
基金资助:
辽宁省教育厅科学研究经费项目(L2019023);辽宁石油化工大学引进人才科研启动基金项目(2019XJJ?004)

Abstract

Abstract:

The Al?15Si?xNb coating was used as the research object to explore the effect of Nb content on the microstructure and corrosion resistance of the coating. The microstructure of the coating was observed by metallographic microscope, the phase composition of the coating was analyzed by XRD, and the corrosion behavior of the coating in 3.5% NaCl solution was characterized and discussed by electrochemical experimental methods (including open circuit potential, impedance spectrum analysis and polarization curve analysis). The results show that the Al?15Si?xNb coating is mainly composed of α?Al, primary Si and eutectic Si. A small amount of NbAl₃ phase and Nb₅Si₃ phase are formed after Nb element is added to the coating; The addition of Nb promoted heterogeneous nucleation and significantly changed the microstructure distribution of the coating. The microstructure of Al?15Si?10Nb coating has a homogeneous distribution. Uniformly distributed α?Al, primary Si and eutectic Si will form many uniformly distributed corrosion micro?battery. It can promote Al anodic reaction and make the Al₂O₃ oxide film formed on the coating surface more continuous. The polarization curve of Al?15Si?xNb coating has passivation like characteristics. When 10% Nb is used, the self?corrosion potential and pitting potential of the coating are higher, the product film resistance is larger, and the dimensional passivation current density is lower. Therefore, Al?15Si?10Nb coating has better corrosion.

Key words: Al?15Si?xNb coating, Microstructure, Cl^- medium, Corrosion behavior

摘要：

以Al?15Si?xNb涂层为研究对象，探究了Nb质量分数对涂层显微组织结构和耐蚀性能的影响规律。采用金相显微镜观察涂层的组织形貌，运用XRD分析涂层的物相组成，应用电化学实验方法（包括开路电位、阻抗谱、极化曲线）表征并讨论了涂层在质量分数为3.5%的NaCl溶液中的腐蚀行为。结果表明，Al?15Si?xNb涂层主要由α?Al、初生Si、共晶Si组成，在涂层中加入Nb元素后生成少量的NbAl₃相和Nb₅Si₃相；Nb元素的加入促进异质形核，较明显地改变涂层的组织分布；Al?15Si?10Nb涂层中的组织更细小且分布更均匀，均匀分布的α?Al、初生Si和共晶Si构成众多均匀分布的腐蚀微电池，促进α?Al阳极反应，使涂层表面生成的Al₂O₃氧化膜更加连续；Al?15Si?xNb涂层的极化曲线具有类钝化特征，其中Nb质量分数为10%时涂层的自腐蚀电位和点蚀电位较高，产物膜电阻较大，维钝电流密度较低，具有更好的耐腐蚀性能。

关键词: Al?15Si?xNb涂层, 显微组织, Cl^－介质, 腐蚀行为

CLC Number:

TQ150

Xianmin Peng, Cheng Lin, Lili Guo, Yanhua Shi, Zhongli Qiao, Libin Lin. Effect of Nb Content on Microstructure and Corrosion Resistance of Al⁃15Si⁃xNb Coating[J]. Journal of Liaoning Petrochemical University, 2023, 43(1): 49-53.

彭贤民, 林成, 郭丽丽, 史艳华, 乔忠立, 林丽彬. Nb质量分数对Al⁃15Si⁃xNb涂层组织与耐蚀性能的影响[J]. 辽宁石油化工大学学报, 2023, 43(1): 49-53.

Figures/Tables 9

涂层试样	$R s / (Ω ⋅ c m 2)$	$Q d l / C$	$n d l$	$R t / (Ω ⋅ c m 2)$	$Q p / C$	$n p$	$R p / (Ω ⋅ c m 2)$
Al⁃15Si	1.195 0	9.956×10^-6	1.000 0	0.232 3	1.235×10^-3	0.758 7	502.5
Al⁃15Si⁃5Nb	0.768 9	1.003×10^-2	0.683 3	38.700 0	3.847×10^-2	0.483 1	100.1
Al⁃15Si⁃10Nb	1.895 0	6.332×10^-4	0.746 0	1.148 0	3.578×10^-4	0.742 3	526.8
Al⁃15Si⁃15Nb	1.215 0	2.667×10^-3	0.687 2	124.500 0	1.289×10^-3	1.000 0	246.4

涂层试样	$R s / (Ω ⋅ c m 2)$	$Q d l / C$	$n d l$	$R t / (Ω ⋅ c m 2)$	$Q p / C$	$n p$	$R p / (Ω ⋅ c m 2)$
Al⁃15Si	1.195 0	9.956×10^-6	1.000 0	0.232 3	1.235×10^-3	0.758 7	502.5
Al⁃15Si⁃5Nb	0.768 9	1.003×10^-2	0.683 3	38.700 0	3.847×10^-2	0.483 1	100.1
Al⁃15Si⁃10Nb	1.895 0	6.332×10^-4	0.746 0	1.148 0	3.578×10^-4	0.742 3	526.8
Al⁃15Si⁃15Nb	1.215 0	2.667×10^-3	0.687 2	124.500 0	1.289×10^-3	1.000 0	246.4

涂层试样	$E S C E / V$	$I P / (A ⋅ c m - 2)$	$E P / V$
Al⁃15Si	－1.223 2	3.293 1×10^-4	-1.024 2
Al⁃15Si⁃5Nb	-1.164 8	1.136 1×10^-3	-0.965 3
Al⁃15Si⁃10Nb	-1.134 5	8.827 3×10^-5	-0.997 4
Al⁃15Si⁃15Nb	-1.241 3	3.538 7×10^-4	-1.060 3

涂层试样	$E S C E / V$	$I P / (A ⋅ c m - 2)$	$E P / V$
Al⁃15Si	－1.223 2	3.293 1×10^-4	-1.024 2
Al⁃15Si⁃5Nb	-1.164 8	1.136 1×10^-3	-0.965 3
Al⁃15Si⁃10Nb	-1.134 5	8.827 3×10^-5	-0.997 4
Al⁃15Si⁃15Nb	-1.241 3	3.538 7×10^-4	-1.060 3

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Effect of Nb Content on Microstructure and Corrosion Resistance of Al⁃15Si⁃xNb Coating

Nb质量分数对Al⁃15Si⁃xNb涂层组织与耐蚀性能的影响

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