AZ31镁合金表面含纳米SiC氟化镁膜层的制备及耐腐蚀性能
Preparation and Corrosion Resistance of MgF_2 Coating Containing SiC Nanoparticles on AZ31 Magnesium Alloy
查看参考文献47篇
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文摘
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为了提高MgF_2膜层的耐腐蚀性能,利用微弧氧化工艺,通过在NH_4F-EG电解液中添加纳米SiC颗粒,在AZ31镁合金表面制备含SiC的MgF_2-SiC膜层,并探究纳米SiC颗粒的浓度对MgF_2膜层组成、结构和耐腐蚀性能的影响。采用SEM、EDS、XRD、XPS等测试方法对含SiC的MgF_2膜层的微观组织、元素含量和物相组成进行分析,利用电化学工作站对膜层的耐腐蚀性能进行测试。结果表明:电解液中的纳米SiC颗粒成功进入MgF_2膜层中。随着电解液中纳米SiC浓度的增加,膜层中的Si、C元素含量增加,Mg、F元素含量减少,膜层变得致密平整,孔隙率减少,膜层缺陷得到有效改善,膜层厚度减小;MgF_2膜层的耐腐蚀性能先增大后减小,当电解液中纳米SiC的浓度为5 g/L时,膜层的耐腐蚀性能最优。因此,在NH_4F-EG电解液中添加纳米SiC颗粒,可以在AZ31镁合金表面制备出含SiC的MgF_2-SiC膜层,且耐腐蚀性能优于不含SiC的MgF_2膜层。 |
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其他语种文摘
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To prepare the MgF_2-SiC coatings containing SiC nanoparticle to further improve corrosion resistance of MgF_2 coatings.MgF_2 coatings containing nano-SiC were fabricated on surface of AZ31 magnesium alloy in non-aqueous electrolyte taking NH_4F-EG as main salt and SiC nanoparticle as additive according to micro-oxidation process The influence of different concentrations of nano-SiC on the microstructure and corrosion resistance of MgF_2 coatings were studied.The microstructure and composition of the coatings were investigated by SEM,EDS,XRD,XPS.The corrosion resistance of the coatings was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy.Results show that SiC nanoparticles in electrolyte are successfully incorporated into the MgF_2 coatings.The content of C and Si increased while the content of Mg and F decreased with the increase of nano-SiC concentration in electrolyte.The coatings porosity and thickness of MgF_2 coatings reduced and defects effectively improved.Compared with the SiC-free MgF_2 coatings,the MgF_2 coatings containing nano-SiC are more compact.The corrosion resistance of the MgF_2 coatings first increases and then decreases.The MgF_2 coatings have the best corrosion resistance when 5 g/L SiC nanoparticle incorporates into electrolyte.Results show that addition of SiC nanoparticles in the NH_4F-EG electrolyte can produce SiC-rich MgF_2-SiC coatings on the surface of AZ31 magnesium alloy,and its corrosion resistance is superior to those of SiC-free MgF_2 coatings. |
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来源
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中国表面工程
,2020,33(1):24-33 【核心库】
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DOI
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10.11933/j.issn.10079289.20190915001
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关键词
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微弧氧化
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纳米SiC
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MgF_2膜层
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AZ31镁合金
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耐腐蚀性能
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地址
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1.
中国科学院兰州化学物理研究所, 固体润滑国家重点实验室, 兰州, 730000
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西北师范大学化学化工学院, 兰州, 730070
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-9289 |
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学科
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金属学与金属工艺 |
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基金
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中科院“十三五”规划重点培育项目
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文献收藏号
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CSCD:6848046
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