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硝酸铈添加剂对7075铝合金微弧氧化陶瓷膜
洪尚坤, 黎清宁, 屈婧婧, 黄炼, 赵隆滨
桂林电子科技大学 材料科学与工程学院, 广西 桂林 541004
摘要:
为进一步提高7075铝合金的表面耐磨性,在硅酸钠、六偏磷酸钠复合电解液中加入不同质量浓度的硝酸铈添加剂,运用微弧氧化技术在其表面原位生长出氧化铝陶瓷膜。采用涂层测厚仪、维氏硬度计、扫描电子显微镜(SEM)、X射线衍射议(XRD)等方法研究了硝酸铈添加剂对陶瓷膜厚度、显微硬度、表面形貌、相组成以及耐磨性的影响。结果表明: 陶瓷膜主要由αAl2O3和γ Al2O3两相组成,当硝酸铈质量浓度为0.12 g/L,陶瓷膜的厚度达到最大,约为18 μm;硬度达到最高,约为916 HV0.2;致密性最佳;陶瓷膜表现出更好的耐磨性能。
关键词:  微弧氧化  硝酸铈  陶瓷膜
DOI:10.11933/j.issn.1007-9289.2014.06.014
分类号:
基金项目:
Effects of Ce(NO3)3 Additive on the Properties of Microarc Oxidation Coatings Formed on 7075 Aluminum Alloy
HONG Shangkun, LI Qingning, QU Jingjing, HUANG Lian, ZHAO Longbin
College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi
Abstract:
In order to further improve the wear resistance of 7075 aluminum alloy, the ceramic coating was insitu formed on 7075 aluminum alloy by applying microarc oxidation(MAO) technique in sodium silicate and sodium hexametaphosphate solution with different concentration Ce(NO3)3 additive. The effects of Ce(NO3)3 additive on thickness, hardness, surface morphology, phase composition and wear resistance of ceramic coatings were investigated using the coating thickness meter, micro Vickers hardness measurer, scanning electron microscope(SEM) and Xray diffraction(XRD). The results show that the ceramic coating primarily consists of αAl2O3 and γ Al2O3. When the Ce(NO3)3 concentration is 0.12 g/L, the denser ceramic coating possesses better wear resistance with the thickness and hardness reaching the highest up to 18 μm and 916 HV0.2, respectively.
Key words:  microarc oxidation(MAO)  Ce(NO3)3  ceramic coatings