碳纳米管/三价铬复合镀层的耐磨抗蚀性能研究

发布时间：2021-04-07 17:35

　　铝表面存在的致密氧化层对铝基体上电镀三价铬涂层具有强阻碍作用。纯铝基体上薄的锌酸盐中间层可使三价铬镀层和多壁碳纳米管复合的三价铬镀层成功镀覆。采用锌酸盐中间层对纯铝基体上三价铬沉积影响显著,获得的三价铬镀层和铬/多壁碳纳米管复合镀层有效提高了纯铝的耐磨和抗蚀性能。电镀温度、电镀时间和镀液pH值等工艺参数对三价铬镀层的厚度、均匀性及显微结构具有较大影响。在电流密度为30A/dm2时,温度30℃,pH值为2,时间40分钟,含有锌酸盐中间层的三价铬镀层和铬/多壁碳纳米管复合镀层厚度均匀,均可达35μm,铬/多壁碳纳米管复合镀层无空洞和裂纹。采用响应面分析法（RSM）数学建模,通过统计计算了不同工艺条件镀层厚度的形成规律。X射线衍射谱（XRD）分析结果表明,与铬/多壁碳纳米管复合镀层相比三价铬镀层具有非晶结构。碳纳米管的加入使铬/多壁碳纳米管复合镀层的硬度由三价铬镀层的HV1N8.0-8.3GPa略提高到HV1N.2-9.8GPa。摩擦学实验结果表明,与三价铬镀层相比较,铬/多壁碳纳米管镀层耐磨性能显著提高。在0.5N-2N载荷下,比磨损率降低了约30-40%。利用裂纹桥接联合模型,解释了多壁... 

【文章来源】：大连理工大学辽宁省 211工程院校 985工程院校 教育部直属院校

【文章页数】：120 页

【学位级别】：博士

【文章目录】：
Abstract
摘要
CONTENTS
中文目录
1 Introduction
    1.1 Aluminum Substrate
        1.1.1 Corrosion Properties of Pure Aluminum
        1.1.2 Mechanical Properties ofPure Aluminum
    1.2 Trivalent Chromium Coating
        1.2.1 Electroplating of Trivalent Chromium Coating
        1.2.2 Solution Components
        1.2.3 Crack Formation and Improvement Method
        1.2.4 Mathematical Modeling and Designing
        1.2.5 Mechanical Properties of Trivalent Chromium coating
        1.2.6 Corrosion Properties of Trivalent Chromium Coating
    1.3 Trivalent Chromium Composite Coating
    1.4 Research Aims and Contents
2 Electroplating Process and Measurement Methods
    2.1 Substrate Materials and Preparation
    2.2 Trivalent Chromium Deposition Process
    2.3 Mathematical Modeling
    2.4 Composition
    2.5 Tribological Properties
    2.6 Corrosion Properties
3 Composition and Structure of the Chromium Coatings
    3.1. Zincates Interlayer
    3.2 Trivalent Chromium Coating
        3.2.1 Current Efficiency
        3.2.2 Mathematical Modeling
        3.2.3 Surface Morphology
    3.3 Chromium Composite Coating with MWCNTs
        3.3.1 Mathematical Modeling
        3.3.2 Surface Morphology
        3.3.3 Composition and Microstructure
    3.4. Discussion
    3.5 Summary
4 Tribological Properties of The Chromium Coatings
    4.1 Hardness
    4.2 Coefficient of Friction
    4.3 Wear Resistance
    4.4 Discussion
    4.5 Summary
5 Corrosion Properties of The Chromium Coatings
    5.1 Anodic Polarization
    5.2 Electrochemical Impedance Spectroscopy（EIS）
    5.3 Discussion
    5.4 Summary
6 Conclusions
Abstract of Innovation Points
References
Published Academic Theses during PhD Period
Acknowledgement
About the Author


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