本文選題：碳納米管　切入點：復(fù)合鍍層　出處：《揚州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：碳納米管以其良好的力學(xué)性能、電學(xué)性能和特殊的中空管狀結(jié)構(gòu)廣泛運用于工業(yè)中,碳納米管結(jié)合工程材料制備耐磨損耐腐蝕的高性能復(fù)合材料已成為近年來的熱門研究項目。本課題中將碳納米管作為第二增強相,采用復(fù)合電沉積的方式制備鎳/碳納米管復(fù)合鍍層并對其性能進行分析,主要研究內(nèi)容如下：(1)研究不同類型表面活性劑對碳納米管分散性及復(fù)合電鍍層性能的影響,實驗發(fā)現(xiàn)陰離子表面活性劑雖不利于碳納米管在陰極表面的沉積,但顯著提高碳納米管與基質(zhì)金屬之間的結(jié)合力,鍍層不易產(chǎn)生缺陷,組織致密,硬度和電化學(xué)性能良好,在電鍍過程中碳納米管也能較好地保持穩(wěn)定懸浮狀態(tài)。研究發(fā)現(xiàn)碳納米管經(jīng)混酸化處理后被打斷,表面帶有活性基團,沉降實驗中處理后的碳納米管分散性明顯改善。因此,在本論文中通過對碳納米管進行酸處理并選用陰離子表面活性劑SDS作為碳納米管的分散劑對其進行分散穩(wěn)定,得到性能更加優(yōu)越的復(fù)合鍍層。(2)以復(fù)合鍍層的沉積速率和鍍層中碳納米管的百分含量為標準,分別研究電鍍液中碳納米管的濃度、陰極電流密度、沉積的時間、pH、溫度、攪拌的速度和分散劑濃度等因素的影響,采用正交實驗和極差分析法獲得制備復(fù)合鍍層的最佳工藝條件。SEM圖片顯示：鍍層表面結(jié)構(gòu)致密,碳納米管在復(fù)合鍍層中均勻分布。通過能譜圖得知復(fù)合鍍層是由Ni、C、O三種元素組成,實現(xiàn)了碳納米管和鎳的共沉積。(3)鍍液中碳納米管的濃度對復(fù)合鍍層中表面形貌及組成成分有很大的影響。結(jié)果顯示隨著鍍液中碳納米管濃度的增加,復(fù)合電鍍層的表面越發(fā)粗糙,并且C元素的含量最高可達11.21%。復(fù)合鍍層硬度測試表明當碳納米管的濃度為2g/L時,復(fù)合鍍層的硬度最高。采用三電極系電化學(xué)工作站測量復(fù)合鍍層在3.5%NaCl溶液中的Tafel曲線及交流阻抗譜,結(jié)果顯示復(fù)合電鍍層的腐蝕電位大于金屬鎳層,腐蝕電流小于金屬鎳層,表明在中性溶液中復(fù)合鍍層的耐蝕性要比純鎳層好。交流阻抗譜為單容抗弧,復(fù)合鍍層雙電層電容的下降和電荷轉(zhuǎn)移電阻的增加都表明鍍層具有更好的耐腐蝕性。
[Abstract]:Carbon nanotubes (CNTs) are widely used in industry because of their good mechanical properties, electrical properties and special hollow tubular structures. Carbon nanotubes (CNTs) bonded with engineering materials have become a hot research project in recent years for the preparation of wear-resistant and corrosion-resistant high performance composites. In this study, carbon nanotubes (CNTs) are regarded as the second reinforcing phase. Nickel / carbon nanotube composite coatings were prepared by composite electrodeposition and their properties were analyzed. The main research contents are as follows: (1) the effects of different surfactants on the dispersion of carbon nanotubes and the properties of composite electroplating coatings were studied. It is found that anionic surfactants are not conducive to the deposition of carbon nanotubes on the cathode surface, but the adhesion between carbon nanotubes and matrix metals is significantly increased, the coating is not easy to produce defects, the microstructure is compact, the hardness and electrochemical properties are good. It was found that the carbon nanotubes were interrupted after mixed acidizing treatment, with active groups on the surface, and the dispersion of carbon nanotubes was improved obviously in the sedimentation experiment. In this paper, the carbon nanotubes were treated with acid and the anionic surfactant SDS was used as dispersant to disperse and stabilize the carbon nanotubes. Based on the deposition rate of the composite coating and the percentage content of carbon nanotubes in the coating, the concentration, cathodic current density, deposition time, pH and temperature of the carbon nanotubes in the electroplating solution were studied, respectively. Under the influence of agitation speed and dispersant concentration, the optimum technological conditions for preparing composite coating were obtained by orthogonal test and range analysis. SEM pictures showed that the surface structure of the coating was compact, The carbon nanotubes are evenly distributed in the composite coating. The results show that the concentration of carbon nanotubes in the plating bath has a great influence on the surface morphology and composition of the composite coating. The results show that the concentration of carbon nanotubes in the plating solution increases with the increase of the concentration of carbon nanotubes in the plating solution. The surface of the composite electroplating layer is rougher, and the content of C element is up to 11.21.The hardness test of the composite coating shows that when the concentration of carbon nanotubes is 2 g / L, The hardness of the composite coating was the highest. The Tafel curve and AC impedance spectrum of the composite coating in 3.5% NaCl solution were measured by the three-electrode electrochemical workstation. The results showed that the corrosion potential of the composite electroplating layer was greater than that of the nickel metal layer, and the corrosion current was lower than that of the nickel metal layer. The results show that the corrosion resistance of the composite coating in neutral solution is better than that of the pure nickel layer, the AC impedance spectrum is single capacitive reactance arc, the decrease of the double layer capacitance and the increase of the charge transfer resistance of the composite coating all show that the coating has better corrosion resistance.
【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ153;TB383.1

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