纳米晶工业纯铁及其Ni镀层的性能研究

发布时间：2018-06-04 11:26

  本文选题：块状纳米晶工业纯铁 + 粗晶工业纯铁　； 参考：《沈阳工业大学》2017年硕士论文

【摘要】：随着科技的发展,纳米材料由于其优异的物理、化学特性而被广泛应用于社会的各行各业。同时,纳米材料的耐蚀性能研究也受到人们的重视。对于材料的防护方法有很多种,其中镀层防护技术由于工艺简单、设备易于操作而成为重要的防护手段。目前,人们大多使用普通块体材料作为基体进行镀层的制备和防护,而对块状的纳米材料为基体研究制备的镀层较少。实验中通过对深度轧制技术制备的块体纳米晶工业纯铁表面进行镀镍防腐工艺研究,探讨不同热处理条件下基体及镀层的腐蚀性能,为纳米材料在防腐方面的应用奠定基础。因此课题研究具有一定的研究意义和使用价值。本文以块体纳米晶工业纯铁(NI)和分别经过500℃和800℃1h保温热处理之后形成的粗晶工业纯铁(CP-500、CP-800)为基体,制备了电镀时间分别为30s、60s、120s和240s以及厚度为5μm、10μm、15μm和20μm的Fe-Ni镀层。利用扫描电镜(SEM)和X射线衍射仪(XRD),观察和分析了镀层的表面形貌和微观结构;采用电化学测试方法,测试了基体和不同厚度镀层分别在0.1mol/L HCl和NaCl溶液介质中的极化曲线和交流阻抗;采用浸泡方法,研究5μm和15μm镀层在0.5mol/L HCl溶液中的腐蚀行为,进一步比较了基体和镀层的腐蚀性能,探讨了腐蚀机理。同时文中对各种镀层的硬度和结合力进行了测试。SEM和XRD的结果表明:NI、CP-500、CP-800的平均晶粒尺寸分别为63nm、33μm和65μm。在电沉积初期,Ni在CP-500上的沉积量大于NI;在电镀240s后,Ni的沉积量趋于一致,并且随着镀层厚度的增加,晶粒尺寸逐渐减小;同时发现NI的Ni晶粒尺寸小于同一厚度下的CP-500和CP-800。电化学测试结果表明:NI基体及其Ni镀层的耐腐蚀性能分别优于CP-500和CP-800基体及其在同一厚度下的Ni镀层,并且随着镀层厚度的增加,耐腐蚀性能增强。基体及镀层在0.1mol/L NaCl溶液中耐腐蚀性能优于其在0.1mol/L HCl溶液中的耐腐蚀性能。浸泡试验结果表明:厚度为15μm的镀层的腐蚀速率小于同一腐蚀时间下的厚度为5μm的镀层,并且同一厚度的镀层,NI的Ni镀层的腐蚀速率更小。显微硬度和结合力测试结果表明:NI基体及其镀层的硬度大于CP-500基体及其镀层,并且NI的Ni镀层的结合力更好,随着镀层厚度的增加,硬度和结合力逐渐增大。
[Abstract]:With the development of science and technology, nanomaterials are widely used in various industries because of their excellent physical and chemical properties. At the same time, the study of corrosion resistance of nanomaterials has been paid more attention. There are many kinds of protection methods for materials, among which coating protection technology has become an important means of protection because of its simple process and easy operation of equipment. At present, most of people use ordinary bulk materials as the substrate to prepare and protect the coatings, but few coatings are prepared by studying the bulk nano-materials as the substrate. In the experiment, the corrosion resistance of substrate and coating of bulk nanocrystalline industrial pure iron prepared by deep rolling technology was studied, and the corrosion properties of substrate and coating under different heat treatment conditions were discussed, which laid a foundation for the application of nanocrystalline iron in anticorrosion. Therefore, the subject research has certain research significance and use value. In this paper, Fe-Ni coatings were prepared on the substrate of bulk nanocrystalline industrial pure iron (NII) and coarse crystalline industrial pure iron (CP-500 CP-800) after heat treatment at 500 鈩，

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