掺杂镧的铝锰合金镀层及其氧化膜的性能研究

发布时间：2018-07-09 21:45

本文选题：Al-Mn合金镀层 + 熔盐电沉积　；参考：《燕山大学》2016年硕士论文

【摘要】：本论文在AlCl3-NaCl-KCl-MnCl2熔盐体系中分别加入不同含量的La_2O_3,通过无机熔融盐电镀技术在Q235钢体上获得Al-Mn合金镀层,研究了熔盐体系中La_2O_3含量对镀层性能的影响。利用SEM、EDS、XRD和电化学方法测试镀层的表面形貌、组分含量、相结构和耐蚀性能。实验结果表明,在熔融盐中加入La_2O_3后,镀层表面沉积的铝晶粒由针状结构变成均匀、致密、层状的合金结构;镀层中La含量显著影响合金镀层的性能,随着镀层中La含量的增加,镀层合金相的结构组成从Al8Mn5合金相转变为铝锰非晶态合金相。通过微弧氧化技术,将Al-Mn合金镀层制成微弧氧化膜。研究了Na_2SiO_3电解液和Na_2CO_3电解液中不同电参数对Al-Mn合金镀层微弧氧化膜的微观形貌、相结构和耐蚀性的影响。4 g/L NaOH、0.2 g/L KMnO7、0.2 g/L NaF和0.2 g/L C12H25OSO3Na分别添加如Na_2SiO_3电解液中后,研究不同添加剂对膜层性能的影响。利用SEM、XRD和电化学方法等测试微弧氧化膜层的表面形貌、相结构和耐蚀性能。实验确定Na_2SiO_3电解液和Na_2CO_3电解液中最佳微弧氧化电参数。结果表明,镀层中的La含量对微弧氧化膜的性能影响显著,随着镀层中La含量的增加,膜层的耐蚀性增强。在Na_2SiO_3电解液中分别加入KMnO_7、NaF和C_(12)H_(25)OSO_3Na均能明显改善膜层的性能。
[Abstract]:In this paper, Al-Mn alloy coating was obtained on Q235 steel by adding different contents of La _ 2O _ 3 into ALCL _ 3-NaCl-KCl-MnCl _ 2 molten salt system. The effect of La _ 2O _ 3 content in molten salt system on the properties of the coating was studied. The surface morphology, composition content, phase structure and corrosion resistance of the coating were measured by SEM XRD and electrochemical method. The experimental results show that after the addition of La _ 2O _ 3 into molten salt, the Al grains deposited on the coating surface change from needle-like structure to homogeneous, dense and layered alloy structure, and La content in the coating significantly affects the properties of the alloy coating. With the increase of La content in the coating, the phase composition of the alloy changed from Al _ 8mn _ 5 alloy to Al _ mn _ 2O _ 2 amorphous alloy. Microarc oxidation film was prepared from Al-Mn alloy coating by micro-arc oxidation technology. The effects of different electrical parameters on the microstructure, phase structure and corrosion resistance of micro-arc oxidation film of Al-Mn alloy coating were studied. After addition of 0.2 g / L KMnO _ 70.2 g / L NAF and 0.2 g / L C _ (12) H _ (25) OSO _ 3Na into Na2SiO3 electrolyte respectively, The effects of different additives on the film properties were studied. The surface morphology, phase structure and corrosion resistance of the micro-arc oxide film were measured by SEM XRD and electrochemical methods. The optimum parameters of micro-arc oxidation in the Na2SiO3 electrolyte and Na2COS3 electrolyte were determined experimentally. The results show that the La content in the coating has a significant effect on the properties of the micro-arc oxide film, and the corrosion resistance of the coating increases with the increase of La content in the coating. Addition of KMnOs 7NaF and C12H25OSO3Na into the tip-down electrolyte can obviously improve the properties of the film.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG174.4

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