本文關鍵詞： 鋁合金 超疏水表面 BTESPT 穩(wěn)定性 耐腐蝕　出處：《南昌航空大學》2017年碩士論文　論文類型：學位論文

【摘要】：本論文以鋁合金為基體材料,利用鹽酸刻蝕及沸水處理在其表面構(gòu)建微納米多級粗糙結(jié)構(gòu),然后通過溶液浸泡法在其表面依次沉積雙-[3-(三乙氧基)硅丙基]四硫化物(BTESPT)和硬脂酸(STA),成功制備出超疏水表面(接觸角為167.0±2.3°,滾動角為3.5±0.8°)為了方便,將制備的超疏水樣品簡記為Al-HCl-H_2O-BTE-STA。利用場發(fā)射掃描電子顯微鏡(FE-SEM)、X-射線光電子譜(XPS)、接觸角測量儀等對樣品的表面形貌、表面組成、表面潤濕性進行了表征;通過監(jiān)測樣品表面潤濕性的變化,對超疏水樣品暴露在大氣環(huán)境及超聲振蕩的乙醇溶液中的穩(wěn)定性進行了研究;通過監(jiān)測樣品表面形貌、表面成分和表面潤濕性的變化,對樣品在不同環(huán)境中(靜態(tài)鹽水浸泡、動態(tài)鹽水浸泡、中性鹽霧)的耐腐蝕性能進行了研究。具體結(jié)果如下:(1)表面形貌、成分、潤濕性。經(jīng)鹽酸刻蝕后,鋁合金表面形成大量微米級階梯狀粗糙結(jié)構(gòu),再經(jīng)沸水處理,微米級結(jié)構(gòu)上會生長出一層致密的水合氧化鋁(AlOOH)納米片。經(jīng)雙-[3-(三乙氧基)硅丙基]四硫化物(BTESPT)和硬脂酸(STA)修飾后,樣品表面靜態(tài)接觸角升至167.0±2.3°,滾動角為3.5±0.8°。(2)穩(wěn)定性。制備的超疏水樣品在大氣環(huán)境和超聲振蕩的乙醇中具有良好的穩(wěn)定性。暴露在大氣環(huán)境中(溫度為20-30℃,相對濕度為50-60%)100天后,樣品表面仍具有極佳的超疏水特性(靜態(tài)接觸角163.7±1.8°,滾動角為10.0±1.1°);在乙醇(40 KHz,100 W)中超聲振蕩60 min后,接觸角變?yōu)?59.9±2.5°,滾動角變成20.0±1.2°。(3)耐腐蝕性。(i)超疏水樣品在靜止NaCl溶液(3.5 wt.%,18天)中的腐蝕。FE-SEM分析表明,浸泡前后表面微觀形貌基本不變。EDS分析表明,浸泡后表面氧元素相對含量增加,氧元素與鋁元素的含量比值[O]/[Al]由0.84提升至0.98。浸泡后,超疏水樣品接觸角仍高達152.4±2.1°,滾動角增大至49.0±1.2°。(ii)超疏水樣品在流動NaCl溶液(3.5 wt.%,50 h)中的腐蝕。將超疏水樣品浸入流速分別為0.5 m/s、1.0 m/s、2 m/s的流動NaCl溶液中50小時后,接觸角分別下降至165.2±1.5°、162.2±2.4°、155.6±1.7°,滾動角變?yōu)?5.0±1.2°、18.7±2.3°、36.2±2.5°。FE-SEM分析表明,浸泡前后表面微觀形貌基本不變。EDS分析表明,當流速為2 m/s時,浸泡后表面氧元素與鋁元素含量的比值[O]/[Al]由0.84提升至0.91。(iii)中性鹽霧試驗(48小時):暴露在中性鹽霧環(huán)境中48 h后,超疏水表面微觀形貌變化不大,表面氧元素于鋁元素的含量比值[O]/[Al]由0.84變成了0.96,接觸角和滾動角分別變成159.5±2.0°、24.0±1.1°。特別需要指出的是,在相同的實驗條件下,本論文制備的Al-HCl-H_2O-BTE-STA超疏水樣品與其對照超疏水樣品(如只具有微米級粗糙結(jié)構(gòu)的超疏水表面Al-HCl-BTE-STA,不含BTESPT層的Al-HCl-H_2O-STA等)相比具有突出的穩(wěn)定性和耐腐蝕性。這主要是由于以下原因:(1)沸水處理在表面引入了氧化層。一方面,氧化層具有阻隔效應,能夠延緩腐蝕發(fā)生;另一方面,氧化層表面的羥基有利于提高BTESPT薄膜與基體之間的結(jié)合,從而增強薄膜穩(wěn)定性。(2)BTESPT/STA雙層薄膜提高了樣品的耐腐蝕性。BTESPT具有很好的腐蝕防護效果,并且,熱處理后具有一定的疏水性。然而,單獨使用BTESPT作為低表面能分子,表面超疏水性欠佳。因此,另外在其表面沉積了STA分子,從而構(gòu)筑了穩(wěn)定的超疏水表面。
[Abstract]:In this paper, Aluminum Alloy as matrix material, by etching and boiling water treatment on the surface of building micro nano hierarchical roughness of hydrochloric acid, and then through the solution immersion method on the surface of successively deposited double -[3- (triethoxysilyl) propyl] four silicon sulfide (BTESPT) and stearic acid (STA), the successful preparation of superhydrophobic surface (the contact angle is 167 + 2.3 degrees, the rolling angle is 3.5 + 0.8 degrees) in order to facilitate the preparation of super hydrophobic sample will be denoted as Al-HCl-H_2O-BTE-STA. by field emission scanning electron microscopy (FE-SEM), X- ray photoelectron spectroscopy (XPS), composed of surface topography and contact angle measurement on the sample surface, surface wettability the characterization; through monitoring the change of sample surface wetting of the samples exposed on the super hydrophobic stability in ethanol solution and ultrasonic oscillation in the atmospheric environment were studied; by monitoring the sample surface morphology, surface composition and surface wettability The change of samples in different environments (static dynamic brine, brine, salt spray corrosion resistance) were studied. The main results are as follows: (1) the surface morphology, composition, wettability. After acid etching, the formation of a large number of micron order ladder rough surface Aluminum Alloy, again after boiling water treatment, micron structure will grow out of a dense layer of alumina hydrate (AlOOH) nanosheets. By double -[3- (triethoxysilyl) propyl] four silicon sulfide (BTESPT) and stearic acid (STA) modified sample surface static contact angle to 167 plus or minus 2.3 degrees, the rolling angle is 3.5. 0.8 degrees. (2) stability. The samples have good stability in the atmospheric environment and ultrasonic ethanol preparation of super hydrophobic. Exposure to atmospheric environment (temperature of 20-30, the relative humidity is 50-60%) 100 days later, the sample surface has excellent super hydrophobic characteristic (static contact angle 163.7 + 1.8 擄,婊氬姩瑙掍負10.0鹵1.1擄);鍦ㄤ箼閱，

本文編號：1455727