本文選題：離子液體　切入點(diǎn)：電沉積　出處：《浙江大學(xué)》2015年碩士論文

【摘要】：鋁具有光澤性、良好的延展性、導(dǎo)電性、導(dǎo)熱性,且表面易生成致密的氧化膜,具有很好的耐蝕性。但傳統(tǒng)的涂鍍鋁方法能耗大,污染環(huán)境等,而且金屬鋁不可能通過(guò)在水溶液中電沉積的方法得到,而只能在質(zhì)子惰性的非水體系中獲得,離子液體具有范圍較廣的電化學(xué)窗口,為鋁的沉積提供了必要條件。 本文用摩爾比為3:2的AlCl3-EMIC離子液體為電鍍液,主要研究?jī)?nèi)容為：①測(cè)試添加不同量的添加劑2-氯煙酰氯后離子液體電沉積過(guò)程中的循環(huán)伏安曲線(xiàn),分析其電化學(xué)特性；②測(cè)試添加不同量添加劑2-氯煙酰氯后離子液體開(kāi)路電位和沉積電位下的阻抗值變化,分析添加劑對(duì)離子液體的影響；③探究脈沖電流電鍍條件對(duì)鍍層的影響；④采用SEM、XRD、EDS.動(dòng)電位極化曲線(xiàn)、阻抗曲線(xiàn)等測(cè)試手段對(duì)鍍層形貌、純度、物理性質(zhì)、耐腐蝕性能進(jìn)行測(cè)試；⑤探究具有相似結(jié)構(gòu)的添加劑對(duì)電鍍效果影響；⑥通過(guò)熱處理增加鋁鍍層表面的氧化膜厚度,提高其防腐蝕性能。 結(jié)果表明：隨著添加劑量的增加,其循環(huán)伏安曲線(xiàn)中陰極沉積區(qū)沉積電流逐漸變小,從原來(lái)的17mA/cm2降低為15mA/cm2,電流效率隨著添加劑的增加而逐漸降低,鋁的起始沉積電位也會(huì)負(fù)移0.1V,而且添加添加劑的離子液體其開(kāi)路電位和沉積電位下其阻抗值也要高于未添加的離子液體；通過(guò)SEM對(duì)鍍層形貌進(jìn)行觀察發(fā)現(xiàn)當(dāng)添加劑的量達(dá)到40-50mg時(shí),能成功的得到粒徑為15nm左右的納米鋁鍍層,相較于微米級(jí)鋁鍍層,納米鋁鍍層外觀光亮光滑,鍍層更加致密,但是當(dāng)離子液體中添加劑的量過(guò)大時(shí),鋁鍍層的表面會(huì)產(chǎn)生微米級(jí)的突起,鋁鍍層發(fā)黃發(fā)暗,會(huì)有明顯的粗糙感；脈沖電流電鍍的得到的鋁鍍層要好于直流電電鍍。在質(zhì)量比為3.5%NaCl溶液中進(jìn)行動(dòng)電位極化曲線(xiàn)、阻抗和浸泡的測(cè)試發(fā)現(xiàn)納米級(jí)鋁鍍層其耐腐蝕性能要遠(yuǎn)遠(yuǎn)好于常規(guī)微米級(jí)鋁鍍層,其腐蝕電流降低了一個(gè)多數(shù)量級(jí)；通過(guò)熱處理即在250℃馬弗爐里加熱12h后確實(shí)能夠提高鋁鍍層的耐腐蝕性能。
[Abstract]:Aluminum has luster, good ductility, electrical conductivity, thermal conductivity, and the surface is easy to form a dense oxide film, with good corrosion resistance.However, the traditional methods of aluminum plating are characterized by high energy consumption and environmental pollution, and aluminum can not be obtained by electrodeposition in aqueous solution, but can only be obtained in non-aqueous proton inert systems. Ionic liquids have a wide range of electrochemical windows.It provides the necessary conditions for the deposition of aluminum.In this paper, AlCl3-EMIC ionic liquids with a molar ratio of 3:2 were used as electroplating solution. The main content of this study was to test the cyclic voltammetry curves of ionic liquids after the addition of different amounts of additive 2-chloronicotinyl chloride, and to analyze their electrochemical characteristics.(2) the impedance changes of ionic liquids under open circuit potential and deposition potential were tested after adding different amounts of additive 2-chlorniacyl chloride. The influence of additives on ionic liquids was analyzed. The influence of pulse current electroplating conditions on coating was investigated. 4 SEMXRDX EDS4 was used.Potentiodynamic polarization curve and impedance curve were used to test the morphology, purity, physical properties and corrosion resistance of the coating. 5. The effect of additives with similar structure on the electroplating effect was investigated.6 the thickness of oxide film on the surface of aluminum coating is increased by heat treatment, and its corrosion resistance is improved.The results show that the deposition current in the cathodic deposition area in the cyclic voltammetry curve decreases from the original 17mA/cm2 to 15 Ma / cm 2, and the current efficiency decreases with the increase of the additive content.The initial deposition potential of aluminum also shifted negatively to 0.1V, and the open-circuit potential and impedance of the ionic liquid added with additives were also higher than those of the unadded ionic liquid.The morphology of the coating was observed by SEM. It was found that when the amount of additive reached 40-50mg, the nanometer aluminum coating with the diameter of 15nm could be obtained successfully. Compared with the micrometer aluminum coating, the nano-aluminum coating had a bright and smooth appearance, and the coating was more compact.However, when the amount of additives in ionic liquids is too large, the surface of aluminum coating will produce micron protrusions, and the coating will have a yellowish and dark color, and it will have an obvious sense of roughness, and the aluminum coating obtained by pulse current electroplating is better than that obtained by direct current electroplating.The potentiodynamic polarization curve in 3.5%NaCl solution with mass ratio was carried out. The results of impedance and immersion test showed that the corrosion resistance of nanometer aluminum coating was much better than that of conventional micrometer aluminum coating, and the corrosion current decreased by one order of magnitude.The corrosion resistance of aluminum coating can be improved by heat treatment in 250 鈩，

本文編號(hào)：1724607