本文選題：鋁合金　切入點(diǎn)：自組裝膜　出處：《北京科技大學(xué)》2017年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：鋁合金是最常用的金屬結(jié)構(gòu)材料之一,在冰箱、冰柜制冷蒸發(fā)器中鋁材已逐步替代銅管材料。但鋁材易發(fā)生局部腐蝕,造成制冷設(shè)備發(fā)生故障。因此,開(kāi)發(fā)工藝簡(jiǎn)單、耐腐蝕性能優(yōu)異的表面防護(hù)膜層顯得很有必要。為此,針對(duì)冰箱、冰柜蒸發(fā)器用鋁材的特點(diǎn)和要求,本論文選用工藝簡(jiǎn)單的自組裝技術(shù)用與鋁材的表面處理上,系統(tǒng)探討了三個(gè)關(guān)鍵科學(xué)問(wèn)題：(1)、優(yōu)化自組裝膜的制備工藝參數(shù)：(2)、研究自組裝膜結(jié)構(gòu)及其耐蝕性能的變化規(guī)律；(3)、結(jié)合分子動(dòng)力學(xué)模擬方法,研究自組裝膜在鋁合金表面的自組裝行為,揭示自組裝膜特定原子與金屬表面之間的化學(xué)鍵成膜機(jī)制。本文首先運(yùn)用自組裝技術(shù)在鋁合金表面制備了以雙(Y-三乙氧基硅基丙基)四硫化物(BTESPT)和十二氟庚基丙基三甲氧基硅烷(G502)為主成膜劑的自組裝膜,考察了自組裝液濃度、自組裝時(shí)問(wèn)、固化溫度和固化時(shí)間對(duì)自組裝膜的影響規(guī)律,獲得了制備自組裝膜的優(yōu)化工藝參數(shù)。在單一自組裝膜基礎(chǔ)上,嘗試采用摻雜和復(fù)合方法制備了自組裝復(fù)合膜。其次采用SEM、面掃描、XPS、中性鹽霧腐蝕試驗(yàn)和腐蝕電化學(xué)性能測(cè)試等多種方法,分別研究了G502和BTESPT自組裝膜的形貌、組成、結(jié)構(gòu)和耐腐蝕性能。結(jié)果表明：兩種自組裝膜層能呈現(xiàn)良好覆蓋性和平整度的網(wǎng)格狀結(jié)構(gòu)：自組裝分子元素在膜層表面分布均勻；BTESPT依靠O、S和H原子與金屬形成AI-O-Si、R-S-OR和Al-O-OH化學(xué)鍵,而G502僅依靠O形成Al-O-Si化學(xué)鍵；BTESPT自組裝膜的耐中性鹽霧腐蝕時(shí)長(zhǎng)比G502自組裝膜的高出3倍多,耐蝕性能提高了約15%,且BTESPT自組裝膜經(jīng)120小時(shí)中性鹽霧腐蝕試驗(yàn)仍保持完好,超過(guò)了現(xiàn)有技術(shù)標(biāo)準(zhǔn)要求；腐蝕電化學(xué)性能測(cè)試顯示自組裝膜電化學(xué)行為是以控制電化學(xué)陽(yáng)極極化為主。對(duì)自組裝復(fù)合膜耐蝕性能研究表明復(fù)合膜耐蝕性能提高不是很明顯。最后,運(yùn)用分子動(dòng)力學(xué)模擬方法分別研究了G502和BTESPT自組裝分子在Al(110)面的吸附機(jī)理。結(jié)果表明：G502和BTESPT自組裝膜分別依靠各自分子中的特征原子與A1原子間形成化學(xué)鍵,BTESPT依靠O、S和H原子與金屬形成Al-O-Si、R-S-OR和Al-O-OH化學(xué)鍵,而G502僅依靠O形成Al-O-Si化學(xué)鍵,推斷BTESPT在金屬表面能形成具有比G502覆蓋度更高、致密性更好的分子吸附膜,有效阻擋腐蝕介質(zhì)與金屬表面直接接觸,達(dá)到提高鋁合金表面耐腐蝕性能的目的�？偟膩�(lái)說(shuō),以BTESTP為主成膜劑的自組裝膜耐蝕性能要優(yōu)于以G502主成膜劑的耐蝕性能,更適用于冰箱、冰柜制冷蒸發(fā)器中鋁材的表1面處理,從而延長(zhǎng)蒸發(fā)器的使用壽命。
[Abstract]:Aluminum alloy is one of the most commonly used metal structural materials. Aluminum has gradually replaced copper pipe material in refrigerators and freezer refrigerators. However, aluminum materials are prone to local corrosion, resulting in the failure of refrigeration equipment. Therefore, the development process is simple. The surface protective coating with excellent corrosion resistance is very necessary. In view of the characteristics and requirements of aluminum for refrigerators and freezer evaporators, this paper uses simple self-assembly technology and aluminum surface treatment. In this paper, three key scientific problems are discussed systematically. The preparation process parameters of the self-assembled films are optimized, the structure and corrosion resistance of the self-assembled films are studied, and the molecular dynamics simulation method is used to study the structure and corrosion resistance of the self-assembled films. Self-assembly behavior of self-assembled films on aluminum alloy surface was studied. The mechanism of chemical bonding film formation between specific atoms and metal surface of the self-assembled film was revealed. In this paper, BTESPT and 12 fluoroheptyl propyl tetrasulphide (BTESPT) and 12 fluoroheptyl propyl were prepared on aluminum alloy surface by self-assembly technique. Self-assembled films of trimethoxysilane (G502) as the main film forming agent, The effects of the concentration of the self-assembled liquid, the self-assembly time, the curing temperature and the curing time on the self-assembly film were investigated, and the optimized process parameters were obtained. The self-assembled composite films were prepared by doping and recombination methods. Secondly, the morphology and composition of G502 and BTESPT self-assembled films were studied by means of SEM, surface scan XPSs, neutral salt spray corrosion test and electrochemical corrosion performance test, respectively. Structure and corrosion resistance. The results show that two kinds of self-assembled films can exhibit good coverage and smoothness of mesh structure: the self-assembled molecular elements are uniformly distributed on the surface of the films. BTESPT forms AI-O-SiR-S-OR and Al-O-OH chemical bonds with metals by OCS and H atoms. On the other hand, the corrosion resistance of G502 self-assembled film is more than three times longer than that of G502 self-assembled film, and the corrosion resistance of BTESPT self-assembled film is improved by about 15%, and the BTESPT self-assembled film remains intact after 120 hours neutral salt spray corrosion test. Exceeding the requirements of existing technical standards; The corrosion electrochemical performance test shows that the electrochemical behavior of the self-assembled film is mainly controlled by electrochemical anodic polarization. The corrosion resistance of the self-assembled composite film is not obviously improved. The adsorption mechanism of G502 and BTESPT self-assembled molecules on Al _ (110) surface was studied by molecular dynamics simulation method. The results show that the self-assembled films of BTESPT and G502 depend on the formation of chemical bonds between the characteristic atoms and A1 atoms in their respective molecules. The Al-O-Si-R-S-OR and Al-O-OH chemical bonds are formed by the atoms of O _ (S) and H with metals. However, G502 only depends on O to form Al-O-Si chemical bond. It is inferred that BTESPT can form a molecular adsorption film on metal surface with higher covering degree and better density than G502, which can effectively block the direct contact between corrosion medium and metal surface. In general, the corrosion resistance of the self-assembled film with BTESTP as the main film is better than that of the G502 main film, and it is more suitable for refrigerators. The surface treatment of aluminum in freezer refrigeration evaporator can prolong the service life of evaporator.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG174.4

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