钢基表面微纳多尺度结构的制备、表征与润湿特性研究及其在抗粘污涂层中的应用

发布时间：2018-05-06 03:15

  本文选题：微纳结构 + 微粒喷丸　； 参考：《广东工业大学》2016年博士论文

【摘要】：微纳多尺度结构对于制备超疏水表面,获得自清洁性能、抗粘污性能,显得至关重要。金属的应用广泛,使用较多。而钢是应用较多的金属之一。钢因应用广泛,不免会对表面超疏水性、抗粘污性等性能有要求。因此,钢基表面微纳结构的制备值得研究。本论文提出将微粒喷丸和阳极氧化结合的两步法,旨在制备钢基表面微纳结构,探索了微粒喷丸构筑微米结构,阳极氧化构筑纳米结构。对微纳结构进行表征,并研究其润湿性能、抗粘污性能。基于塑性变形原理,提出了微粒喷丸制备45钢表面微米结构的方法。利用宏观和微观形貌分析、表面轮廓分析、表面粗糙度分析等技术手段,研究所制备的表面微米结构的形貌特征。结果表明,微粒喷丸能够在钢基表面构筑凹凸有致的可控表面微米粗糙结构。喷丸压力、弹丸大小和喷丸时间均对表面微米结构的构筑有影响。通过阳极氧化法,在45钢表面构筑表面纳米结构。探讨表面预处理状态对钢阳极氧化的影响,探究喷丸处理对钢阳极氧化的影响及机制。通过SEM、EDS、XPS、 XRD、Raman、IR等技术手段对阳极氧化膜进行表征,研究了其化学组成、形貌特征。同时对阳极氧化钢进行了极化曲线测试。结果表明,阳极氧化能够在45钢表面构筑纳米结构。喷丸预处理对45钢的阳极氧化有促进作用。45钢阳极氧化膜的外观颜色为黄色,随阳极氧化电流密度增大,颜色加深,在相同的电流密度条件下,随着阳极氧化时间增加,颜色变深。阳极氧化膜主要含Fe、O、C、F元素。Fe以三价形式存在。阳极氧化产物主要为α-Fe2O3,还有FeOOH。与未阳极氧化45钢相比,阳极氧化45钢的自腐蚀电位高,自腐蚀电流密度低,耐蚀性有所提升。通过两步法,在45钢表面制备微纳多尺度结构。通过SEM、AFM等技术手段,对该微纳结构进行研究,揭示其形貌特征。对两步法制备的45表面微纳结构的润湿性进行研究,探索表面结构对润湿性的影响以及表面化学修饰对润湿性的影响。结果表明,微纳结构的主要特征是纳米结构叠加在微米结构之上。微米结构主要是凹凸起伏的纹理。纳米结构是以花状团簇为典型形貌特征。纳米结构形貌受阳极氧化电流密度影响。表面结构能决定表面接触角的大小。化学修饰前,具有多微纳尺度粗糙结构的表面的接触角最低。经化学修饰后,具有微纳结构的表面接触角最大,呈超疏水性。相比之下,全氟癸基三氯硅烷的修饰效果比硬脂酸的好。将两步法制备的微纳结构应用于抗粘污涂层中。通过两步法制备出表面微纳结构,并经化学修饰,制各出具有超疏水性的微纳多尺度结构涂层,将该涂层应用于橡胶硫化模具抗粘污。对比研究结果表明,化学修饰降低了表面的自由能,起到了减少表面污染的作用。表面结构对防污染性能有影响。微纳结构是一种多尺度结构,能“托起”污染物,减小了表面与污染物的真实接触面积,使污染降低。
[Abstract]:The micro-nano-multi-scale structure is very important for the preparation of superhydrophobic surfaces to obtain self-cleaning and anti-fouling properties. Metals are widely used and are widely used. Steel is one of the metals that are widely used. Due to the wide application of steel, surface hydrophobicity, anti-fouling and other properties are required. Therefore, the preparation of steel-based surface microstructures is worth studying. In this paper, a two-step method combining particle peening and anodic oxidation was proposed to prepare the micro-nano structure of steel substrate, and to explore the micron structure of microparticle shot peening and nanostructure of anodic oxidation. The microstructures were characterized and their wettability and anti-fouling properties were studied. Based on the principle of plastic deformation, a method for fabricating microstructures on 45 steel surface by shot peening was proposed. By means of macro and micro morphology analysis, surface profile analysis and surface roughness analysis, the morphology characteristics of the prepared surface microstructures were studied. The results show that the micrometer rough structure of the controlled surface can be constructed by shot peening on the steel substrate. Shot peening pressure, shot size and shot peening time all influence the construction of surface micron structure. Surface nanostructures were constructed on the surface of 45 steel by anodic oxidation. The effect of surface pretreatment on anodic oxidation of steel and the mechanism of shot peening on anodic oxidation of steel were discussed. The anodic oxide films were characterized by means of SEM-EDSX XPS, XRD- Ramanhe IR, and their chemical composition and morphology were studied. At the same time, the polarization curve of anodized steel was measured. The results show that the anodic oxidation can construct nanostructures on the surface of 45 steel. Shot peening pretreatment can promote anodic oxidation of 45 steel. The appearance color of anodic oxide film of 45 steel is yellow. With the increase of anodizing current density, the color of anodic oxidation film deepens. At the same current density, the anodic oxidation time increases with the increase of anodic oxidation time. The color darkened. The anodic oxide film mainly contains Fe _ 2O _ C _ (F) element. Fe exists in the form of trivalent. The anodized products are mainly 伪 -Fe _ 2O _ 3 and FeOOH. Compared with 45 steel without anodizing, the corrosion resistance of 45 steel was improved with higher corrosion potential, lower corrosion current density and higher corrosion resistance. The micro-nano-multi-scale structure was prepared on the surface of 45 steel by two-step method. The microstructures were investigated by means of SEMMA-AFM, and the morphology of the microstructures was revealed. The wettability of 45 surface microstructures prepared by two-step method was studied to explore the effect of surface structure on wettability and the effect of surface chemical modification on wettability. The results show that the main feature of microstructures is that nanostructures are superimposed on micron structures. Micron structures are mainly ups and downs of the texture. The typical morphology of nanostructures is floral clusters. The morphology of nanostructures is affected by the current density of anodic oxidation. The surface structure can determine the contact angle of the surface. Before chemical modification, the surface with multi-micro-nano-scale rough structure has the lowest contact angle. After chemical modification, the surface contact angle with micro and nano structure is the largest and superhydrophobic. In contrast, perfluorodecyl trichlorosilane is more effective than stearic acid. The micro-nano structure prepared by two-step method was applied to anti-fouling coating. The surface micro-nano structure was prepared by two-step method. After chemical modification, micro-nano multi-scale structure coatings with super hydrophobicity were prepared. The coating was applied to rubber vulcanization mould to resist adhesion and fouling. The results show that chemical modification reduces the free energy of the surface and reduces the surface pollution. The surface structure has an effect on the anti-pollution performance. Micro-nano structure is a multi-scale structure, which can "lift" pollutants, reduce the real contact area between the surface and pollutants, and reduce the pollution.
【学位授予单位】：广东工业大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TG174.4
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本文编号：1850531