本文關(guān)鍵詞：仿生超疏水及耐腐蝕鎂合金表面的制備與機(jī)理　出處：《吉林大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鎂合金 仿生 超疏水 耐腐蝕性 可逆轉(zhuǎn)換

【摘要】：近年來，由于電子、航空航天、汽車機(jī)械制造、高精端儀器設(shè)備的快速發(fā)展，對有色金屬的需求也隨之越來越大。而鎂合金系列產(chǎn)品由于是有色實(shí)用金屬中的最輕的金屬，具有高比強(qiáng)度、高比剛性，使其具有廣闊的應(yīng)用前景。但是，由于鎂具有較高活性，鎂合金表面較易耐腐蝕，嚴(yán)重制約了其應(yīng)用與發(fā)展。本文借鑒自然界中典型植物葉表面具有疏水自潔功能，進(jìn)行了鎂合金表面仿生設(shè)計(jì)，通過激光加工、化學(xué)刻蝕、電沉積法等進(jìn)行了仿生結(jié)構(gòu)超疏水表面的制備，該表面都顯示了較好的耐腐蝕性。不僅如此，本論文還基于生物智能調(diào)控的原理，，以陽極氧化方法在AZ31鎂合金基體制備了超疏水性表面，并對超疏水性及超親水性的可逆變換進(jìn)行了試驗(yàn)與機(jī)理探索。 本文通過掃描電子顯微鏡（SEM）、光學(xué)接觸角測試儀(CA)、X-射線衍射（XRD）、傅立葉紅外光譜儀（FTIR）、能譜（EDS）、電化學(xué)工作站（CHI）等測試手段，對樣品表面的形貌、潤濕性、成分、耐腐蝕性等性能進(jìn)行測試與分析。分析了形態(tài)、結(jié)構(gòu)、材料的影響機(jī)制，揭示了潤濕性、耐腐蝕性、穩(wěn)定性等功能機(jī)理。 運(yùn)用激光加工結(jié)合化學(xué)刻蝕的方法制備了仿生超疏水表面。首先采用激光毛化處理機(jī)在AZ91D鎂合金表面加工出微米級的凹坑，隨后經(jīng)過AgNO3水溶液的化學(xué)刻蝕，可以看到明顯的納米級網(wǎng)格狀結(jié)構(gòu)，最后在DTS溶液中浸泡修飾，制備出的疏水表面與水接觸角達(dá)到138.4±2°。通過電化學(xué)工作站進(jìn)行腐蝕性能測試，結(jié)果表明制備的AZ91D疏水鎂合金表面相比純AZ91D鎂合金表面耐腐蝕性得到明顯改善。 運(yùn)用電化學(xué)沉積的方法制備仿生超疏水表面。通過對試樣的化學(xué)鍍預(yù)處理以及電化學(xué)沉積，在電沉積電流密度為15mA/cm2，時間為3min，電解液濃度為1.0mol/L下制備出具有超疏水性的AZ91D鎂合金表面。表面接觸角可達(dá)到160.8±1°，滾動角僅為1.8±1°，表面具有明顯的菜花狀微納米分級結(jié)構(gòu)。通過電化學(xué)工作站的腐蝕性測試，結(jié)果表明仿生超疏水AZ91D的耐腐蝕性明顯提高。又進(jìn)一步考察了超疏水試樣的穩(wěn)定性，結(jié)果表明該試樣在pH為2-12范圍內(nèi)具有長期潤濕接觸角穩(wěn)定性。 運(yùn)用陽極氧化法制備了溫度調(diào)控潤濕性的仿生表面。首先采用陽極氧化在AZ31鎂合金表面進(jìn)行氧化處理，隨后在硬脂酸溶液中進(jìn)行浸泡修飾，制備出的超疏水性表面靜態(tài)接觸角達(dá)到163.8±1.5°。超疏水性試樣在熱處理溫度低于200℃的范圍內(nèi)，都具有疏水性。當(dāng)熱處理溫度達(dá)到300℃后，表面從超疏水狀態(tài)變?yōu)槌H水狀態(tài)，當(dāng)超親水后的試樣經(jīng)過再次硬脂酸修飾后，表面潤濕性從超親水狀態(tài)又轉(zhuǎn)變?yōu)榱顺杷疇顟B(tài)，實(shí)現(xiàn)了溫度控制潤濕性的可逆轉(zhuǎn)換。通過電化學(xué)分析，超疏水試樣的耐腐蝕性得了明顯改善。
[Abstract]:In recent years, due to the rapid development of electronic, aerospace, automotive machinery manufacturing, high-precision instruments and equipment. The demand for non-ferrous metals is also increasing, and magnesium alloy series are the lightest metals in colored practical metals, with high specific strength, high specific rigidity, so it has a broad application prospects. Because of the high activity of magnesium alloy, the surface of magnesium alloy is easy to resist corrosion, which seriously restricts its application and development. In this paper, the bionic design of magnesium alloy surface has been carried out based on the hydrophobic self-cleaning function of typical plant leaf surface in nature. The biomimetic superhydrophobic surface has been prepared by laser processing, chemical etching and electrodeposition. The surface shows good corrosion resistance. Moreover, this paper is based on the principle of intelligent biological regulation. The superhydrophobic surface of AZ31 magnesium alloy was prepared by anodizing method, and the reversibility of superhydrophobicity and superhydrophilicity was investigated. In this paper, a scanning electron microscope (SEM), an optical contact angle tester, an X-ray diffractometer (XRDX), a Fourier infrared spectrometer (FTIR), and an energy spectrum (EDS) have been developed. The morphology, wettability, composition and corrosion resistance of the sample surface were tested and analyzed by electrochemical workstation (Chi). The influence mechanism of morphology, structure and material was analyzed. The functional mechanisms of wettability, corrosion resistance and stability are revealed. The biomimetic superhydrophobic surface was prepared by laser processing and chemical etching. Firstly, micron scale pits were fabricated on the surface of AZ91D magnesium alloy by laser texturing machine. After the chemical etching of AgNO3 aqueous solution, we can see the obvious nanoscale mesh structure, and then immerse it in the DTS solution. The contact angle between the hydrophobic surface and the water was 138.4 鹵2 擄. The corrosion performance of the hydrophobic surface was tested by electrochemical workstation. The results show that the corrosion resistance of the surface of AZ91D hydrophobic magnesium alloy is obviously improved compared with that of pure AZ91D magnesium alloy. The biomimetic superhydrophobic surface was prepared by electrochemical deposition. The electroless plating pretreatment and electrochemical deposition were carried out at a current density of 15 Ma / cm ~ (2) and a time of 3 min. The surface of AZ91D magnesium alloy with super hydrophobicity was prepared at the concentration of 1.0 mol / L electrolyte. The surface contact angle was 160.8 鹵1 擄and the rolling angle was 1.8 鹵1 擄. The surface has obvious rapeseed-like micro-nano-scale structure. The corrosion of the surface is tested by electrochemical workstation. The results show that the corrosion resistance of biomimetic superhydrophobic AZ91D is obviously improved, and the stability of superhydrophobic AZ91D is also investigated. The results show that the sample has a long-term contact angle stability in the pH range of 2-12. The biomimetic surface of wettability controlled by temperature was prepared by anodizing method. Firstly, the surface of AZ31 magnesium alloy was oxidized by anodic oxidation, and then modified by immersion in stearic acid solution. The static contact angle of the superhydrophobic surface was 163.8 鹵1.5 擄. The superhydrophobic sample was prepared in the range of heat treatment temperature below 200 鈩

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