本文選題：聚苯胺 + 改性��； 參考：《上海電力學(xué)院》2016年碩士論文

【摘要】：聚苯胺(PANI)因單體價廉易得、摻雜機制獨特、制備簡單等優(yōu)點,在腐蝕防護中備受關(guān)注。通常采用化學(xué)氧化法制備聚苯胺,將其與環(huán)氧樹脂混合,涂覆于防護基體表面�；蚴遣捎秒娀瘜W(xué)聚合,在金屬表面制備聚苯胺膜。但前者制備的涂層中聚苯胺難溶、易團聚、加工性差。后者聚苯胺結(jié)構(gòu)多孔、屏蔽作用較弱、附著力欠缺。由此可見單一聚苯胺涂層并非金屬防腐的理想選擇。改性聚苯胺復(fù)合涂層將成為拓展聚苯胺在腐蝕領(lǐng)域應(yīng)用的研究重點。因此采用無機物或有機聚合物改性聚苯胺,提高其粘附力、改善分散性、增強耐蝕穩(wěn)定性具有極其重要的實際意義和應(yīng)用價值。本文采用共混法分別制備Mn_2O_3改性PANI復(fù)合涂層、Zn S改性PANI復(fù)合涂層。采用電化學(xué)法制備PVP改性PANI復(fù)合涂層。通過改性,增強PANI涂層的性能,主要研究成果如下:(1)采用共混法成功制得不同質(zhì)量比的Mn_2O_3/PANI,將其涂覆于Q235碳鋼表面制備復(fù)合涂層。研究不同添加量的Mn_2O_3對改性PANI復(fù)合涂層的潤濕性及防腐蝕性能的影響。結(jié)果表明,Mn_2O_3的加入,使PANI涂層具有更好的疏水性。當(dāng)Mn_2O_3在復(fù)合材料中的質(zhì)量分?jǐn)?shù)為10%時,Mn_2O_3均勻填入PANI的間隙之中,顆粒結(jié)合緊密,防腐性能達到最佳。且在3.5%Na Cl中浸泡37天,其接觸角仍能達到114.5°。(2)采用共混法成功制得不同質(zhì)量比的納米Zn S改性PANI復(fù)合物,將其涂覆于Q235碳鋼表面制備復(fù)合涂層。研究不同添加量的Zn S對PANI的電導(dǎo)率及復(fù)合材料防腐蝕性能的影響。結(jié)果表明Zn S的加入,能顯著提高PANI的電導(dǎo)率。納米Zn S改性PANI復(fù)合材料中Zn S和PANI二者均勻分散,顯著提高其耐蝕性能。當(dāng)Zn S和PANI的質(zhì)量比為1:1時,防腐性能最優(yōu)。在3.5%Na Cl溶液中浸泡1周后,復(fù)合涂層的保護效率高達99.9%。浸泡1個月后復(fù)合涂層的表面形貌發(fā)生變化,仍為致密的保護膜。相比于PANI涂層,對應(yīng)的自腐蝕電位正移172m V,腐蝕電流密度由4.05×10-8A·cm-2降低為4.57×10-9A·cm-2。(3)采用循環(huán)伏安法在304不銹鋼(304SS)表面沉積不同質(zhì)量比的PVP-PANI薄膜。實驗結(jié)果表明,與PANI涂層相比,PVP-PANI涂層在0.1mol/LKOH溶液中能為304SS提供更好的保護。少量的PVP可以顯著改善PANI的團聚現(xiàn)象,但對提高PANI的電導(dǎo)率無明顯作用。當(dāng)PVP在混合溶液中的質(zhì)量分?jǐn)?shù)為1%時,其防腐性能最優(yōu)。在0.1mol/LKOH溶液中浸泡1h后,與浸泡前相比,1%PVP-PANI/SS發(fā)生明顯變化,其表面生成更加致密的網(wǎng)狀交聯(lián)薄膜,且接觸角為138.6°。這種結(jié)構(gòu)能有效阻擋腐蝕性離子和腐蝕產(chǎn)物的滲透,為304不銹鋼提供更好的物理屏蔽作用。對應(yīng)電極的腐蝕電位相較304不銹鋼,正移約620m V,腐蝕電流密度降低近三個數(shù)量級,保護效率高達99.7%。
[Abstract]:Polyaniline polyaniline (pani) has attracted much attention in corrosion protection due to its advantages of low cost, unique doping mechanism and simple preparation. Polyaniline is usually prepared by chemical oxidation, mixed with epoxy resin and coated on the surface of protective matrix. Polyaniline film was prepared on metal surface by electrochemical polymerization. However, Polyaniline in the coating prepared by the former is insoluble, easy to agglomerate and poor processability. The latter has porous structure, weak shielding and poor adhesion. This shows that the single Polyaniline coating is not an ideal choice for metal anticorrosion. The modified Polyaniline composite coating will become the focus of research on the application of Polyaniline in corrosion field. Therefore, it is of great practical significance and application value to use inorganic or organic polymer to modify Polyaniline, to improve its adhesion, to improve its dispersion and to enhance its corrosion resistance and stability. In this paper, Mn_2O_3 modified PANI composite coatings and Zn S modified PANI composite coatings were prepared by blending method. PVP modified PANI composite coating was prepared by electrochemical method. The main research results are as follows: 1) mn _ 2O _ 2O _ 3 / PANI with different mass ratio was successfully prepared by blending method, and the composite coating was prepared on the surface of Q235 carbon steel. The effect of different amount of Mn_2O_3 on wettability and corrosion resistance of modified PANI composite coating was studied. The results show that the addition of Mn2O3 makes the PANI coating more hydrophobic. When the mass fraction of Mn_2O_3 in the composite material is 10, Mn-2O3 is evenly filled into the gap of PANI, the particles are tightly bonded and the anticorrosive property is the best. After immersion in 3.5%Na Cl for 37 days, the contact angle could still reach 114.5 擄. 2) Nano-ZnS modified PANI composites with different mass ratios were successfully prepared by blending method, and the composite coatings were prepared on Q235 carbon steel surface. The effects of different amount of ZnS on the conductivity of PANI and the corrosion resistance of composites were studied. The results show that the conductivity of PANI can be improved by adding ZnS. ZnS and PANI were uniformly dispersed in nano-ZnS modified PANI composites, and their corrosion resistance was improved significantly. When the mass ratio of ZnS and PANI is 1:1, the anticorrosive property is the best. After immersion in 3.5%Na Cl solution for 1 week, the protective efficiency of the composite coating was 99.9%. After soaking for one month, the surface morphology of the composite coating changed and remained a dense protective film. Compared with PANI coating, the corrosion current density was reduced from 4.05 脳 10 ~ (-8) A cm-2 to 4.57 脳 10 ~ (-9) A cm ~ (- 2. 3) by cyclic voltammetry. The PVP-PANI films with different mass ratios were deposited on 304 stainless steel (304SS) surface by cyclic voltammetry. The experimental results show that the PVP-PANI coating can provide better protection for 304SS in 0.1mol/LKOH solution than that of PANI coating. A small amount of PVP could significantly improve the aggregation of PANI, but had no effect on the conductivity of PANI. When the mass fraction of PVP in mixed solution is 1%, the anticorrosive property of PVP is optimal. After being immersed in 0.1mol/LKOH solution for 1 h, the PVP-PANI- / SS had obvious change compared with that before soaking, and the surface of PVP-PANI- / SS was more dense, and the contact angle was 138.6 擄. This structure can effectively block the penetration of corrosive ions and corrosion products and provide better physical shielding for 304 stainless steel. Compared with 304 stainless steel, the corrosion potential of the corresponding electrode is about 620mV, the corrosion current density is reduced by nearly three orders of magnitude, and the protection efficiency is as high as 99.7%.
【學(xué)位授予單位】：上海電力學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG174.46;O633.21

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本文編號：1941610