本文選題：鋁合金　切入點(diǎn)：電沉積　出處：《西北農(nóng)林科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：均三嗪二硫醇類化合物因具有熱力學(xué)穩(wěn)定的三嗪環(huán)和高反應(yīng)活性的巰基而常常被用作金屬表面的防護(hù)膜,其工藝簡單,無毒無害,應(yīng)用廣泛,且具有良好的防腐性能。但是三嗪二硫醇類的薄膜具有分子尺寸方面的缺陷,目前常用的彌補(bǔ)方法包括改變?nèi)憾虼碱惙肿拥娜〈鶊F(tuán)、自組裝與電化學(xué)沉積成膜工藝方法的聯(lián)合使用以及復(fù)合薄膜的制備等方法,至于通過添加活性或者惰性的納米粒子來修飾均三嗪二硫醇類防護(hù)薄膜的研究還沒有報(bào)道。因此很有必要探索活性或者惰性的納米粒子對均三嗪二硫醇類防護(hù)薄膜的修飾效果。本實(shí)驗(yàn)采用的聚合單體為6-N,N-二丁基-1,3,5-三嗪-2,4-硫醇單鈉鹽(簡稱DBN),采用AA5052型鋁合金為基體,利用電化學(xué)技術(shù)中的雙電位電沉積法聚合成膜。在預(yù)處理工藝選擇上,通過系統(tǒng)的比較拋光劑打磨處理、電暈處理、混合堿處理及水合肼處理四種預(yù)處理方法對電沉積成膜的影響,探索出電沉積均三嗪二硫醇類化合物防護(hù)薄膜層的最佳預(yù)處理?xiàng)l件。在最佳預(yù)處理?xiàng)l件下,探索出最佳的鈰離子濃度;在最佳鈰離子濃度下,研究了鈰離子對三嗪二硫醇薄膜的修飾效果。實(shí)驗(yàn)中采取的實(shí)驗(yàn)參數(shù)為:DBN單體的濃度為5 mmol/L;第一步和第二步的階躍電位分別為1.6 V和6V,階躍時(shí)間分別為30 s和10 s;電沉積膜后需進(jìn)行固化處理,溫度設(shè)置為100℃、時(shí)間設(shè)置為10 min。實(shí)驗(yàn)結(jié)論如下:(1)最佳預(yù)處理方式為電暈處理。電暈處理后,基體表面不僅不會(huì)受到任何損害,而且基體表面電沉積形成的聚合薄膜的疏水性與防蝕能力比其他預(yù)處理方式的更好。(2)最佳鈰離子濃度為0.5 mM,在該濃度下鈰離子修飾的PDB聚合薄膜的疏水性最好,腐蝕電流密度也最小,保護(hù)效率最高。(3)FT-IR圖譜分析結(jié)果表明通過雙電位電沉積法能在鋁合金表面沉積一層PDB聚合薄膜,且鈰離子的存在并不影響PDB聚合薄膜的形成。(4)電化學(xué)測試(即開路電位測試,動(dòng)電位極化曲線測試,電化學(xué)阻抗譜分析)結(jié)果表明作為活性腐蝕抑制粒子,鈰離子修飾PDB聚合薄膜的防腐蝕能力明顯增強(qiáng),其對鋁合金基體具有良好的防護(hù)性能。(5)初步推測鈰離子的自修復(fù)作用是由于在陰極區(qū)的氧化還原反應(yīng)產(chǎn)生的OH-離子與鈰離子反應(yīng)生成鈰的氧化物或者氫氧化物等沉淀物所致,或是由于鈰離子能與PDB聚合薄膜中三嗪環(huán)上的π-電子的產(chǎn)生絡(luò)合作用所致。
[Abstract]:Due to their thermodynamically stable triazine ring and highly reactive thiol, m-triazine dimercaptan compounds are often used as protective film on metal surface. The process is simple, innocuous, and widely used. But the thin films of triazine dimercaptan have some defects in molecular size. The commonly used methods include changing the substituent groups of triazine dimercaptan molecules. The combined use of self-assembly and electrochemical deposition process and the preparation of composite films, There is no report on the modification of triazine-dimercaptan protective films by adding active or inert nanoparticles. Therefore, it is necessary to explore the active or inert nanoparticles for the protection of m-triazine-dimercaptan thin films. The polymerization monomer used in this experiment is 6-N- N- (2-#china_person0#) -1- (3) -triazine-4-mercaptan monosodium salt (DBN), and AA5052 type aluminum alloy is used as the substrate, and the monosodium sodium salt (DBN) is used as the base of the monosodium monosodium (AA5052). The film was polymerized by double potential electrodeposition in electrochemical technology. In the selection of pretreatment process, the polishes and corona treatment were compared systematically. The effects of four pretreatment methods of mixed alkali treatment and hydrazine hydrate treatment on electrodeposition film formation were investigated. Find out the best concentration of cerium ion, at the best concentration of cerium ion, The modification effect of cerium ion on triazine dimercaptan film was studied. The experimental parameters were as follows: concentration of 1: DBN monomer was 5 mmol / L, step potential of the first step and the second step were 1.6 V and 6 V, step time were 30 s and 10%, respectively. S; after electrodeposition, the film needs to be cured, The experimental results show that the best pretreatment method is corona treatment. After corona treatment, the substrate surface will not be damaged. Moreover, the hydrophobicity and corrosion resistance of the polymer films formed by electrodeposition on the substrate were better than those of other pretreatment methods.) the optimum concentration of cerium ion was 0.5 mm, and the hydrophobicity of the PDB polymer films modified by cerium ion was the best at this concentration. The corrosion current density was also the lowest and the protection efficiency was the highest. The results of FT-IR analysis showed that a layer of PDB polymer film could be deposited on the surface of aluminum alloy by double potential electrodeposition. Moreover, the existence of cerium ion has no effect on the formation of PDB polymeric thin films. The results of electrochemical measurements (I. e., open-circuit potential measurement, potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy analysis) indicate that cerium ion is an active corrosion inhibitor particle. The anticorrosion ability of cerium ion modified PDB polymer film was obviously enhanced. It is suggested that the self-repair effect of cerium ion is due to the reaction of OH- ion in cathode region with cerium ion to form cerium oxide or hydroxide. Or because the cerium ion can complexate with 蟺-electron on triazine ring in PDB polymerization film.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ153

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本文編號：1619862