疏水膜以及自組裝膜對(duì)金屬銅在海水中的防腐防污研究
發(fā)布時(shí)間：2019-01-03 13:18
【摘要】：銅具有優(yōu)良的導(dǎo)電、導(dǎo)熱性,機(jī)械性能和成形性,因此銅作為一種重要的金屬已被廣泛用于很多領(lǐng)域。然而,銅是一種化學(xué)性質(zhì)活潑的金屬,海水中不僅含有可以和金屬銅發(fā)生配位反應(yīng)的氯離子,還含有可以腐蝕銅的微生物,比如:大腸桿菌。因此研究金屬銅在海水中的緩蝕很重要。本文主要采用表面修飾的方法,一種是利用含有氮原子的嘧啶分子4-苯基嘧啶(4-PPM)在表面形成自組裝膜,用電化學(xué)阻抗、電化學(xué)極化曲線表征該自組裝膜緩蝕性能,并運(yùn)用相關(guān)的計(jì)算公式計(jì)算出不同方法所得到的緩蝕效率。通過密度泛函理論(DFT)計(jì)算了分子的最高分子占有軌道(HOMO)和最低分子未占有軌道(LUMO)以及偶極矩,最后利用拉曼光譜對(duì)分子在電極表面的吸附構(gòu)型以及自組裝膜的均一性進(jìn)行檢測(cè)。另外一種是基于聚多巴胺(PDA)的粘附性,在銅表面首先修飾具有粘性的聚多巴胺,接著修飾疏水性的十二烷基硫醇分子(1-DT),制得具有疏水性的表面。用接觸角測(cè)量技術(shù),近紅外技術(shù),以及X射線光電子能譜(XPS)等手段表征該疏水膜的成功制備。通過電子掃描顯微鏡(SEM)表明該疏水膜對(duì)銅在含有氯離子的海水中的較好的緩蝕能力。此外因?yàn)殂y納米粒子有很好的抗菌性,因此在上述疏水膜的表面又引入了一定大小的銀納米粒子,用來延緩大腸桿菌對(duì)金屬銅帶來的腐蝕。用XPS等手段表征銀納米粒子的修飾成功,用SEM手段表明有銀納米粒子修飾的疏水膜有很好的抗菌性。1采用4-PPM分子作為自組裝分子,研究了不同的組裝時(shí)間和不同濃度的4-PPM溶液對(duì)銅緩蝕性能影響。當(dāng)組裝時(shí)間為6 h,組裝濃度為10-4時(shí),緩蝕效率最高,緩蝕效率可以達(dá)到83.2%。2利用PDA和1-DT的共同修飾制得了接觸角為110°的疏水表面。該疏水表面是1-DT通過Cu-S鍵的形成作用于PDA的裂縫當(dāng)中。且SEM結(jié)果表明該疏水表面的抗腐蝕效果良好。3在PDA和1-DT的疏水膜的基礎(chǔ)上又引入了銀納米粒子,SEM結(jié)果表明該復(fù)合膜對(duì)大腸桿菌有很好的抗菌性,修飾銀納米粒子的銅表面存在最少的大腸桿菌。
[Abstract]:Copper has excellent electrical conductivity, thermal conductivity, mechanical properties and formability, so copper as an important metal has been widely used in many fields. However, copper is a chemically active metal. Seawater contains not only chloride ions that can coordinate with copper, but also microorganisms that can corrode copper, such as Escherichia coli. Therefore, it is important to study the corrosion inhibition of copper in seawater. In this paper, the method of surface modification is mainly used. One is to form a self-assembled film on the surface of pyrimidine molecule 4-phenylpyrimidine (4-PPM) containing nitrogen atom. The corrosion inhibition property of the self-assembled film is characterized by electrochemical impedance and electrochemical polarization curves. The corrosion inhibition efficiency obtained by different methods is calculated by using the relevant formulas. By using density functional theory (DFT), the maximum molecular occupied orbital (HOMO) and the lowest molecular non-occupied orbital (LUMO) and dipole moments are calculated. Finally, the adsorption configuration and homogeneity of the self-assembled films on the electrode surface were measured by Raman spectroscopy. The other is based on the adhesion of polydopamine (PDA) to the surface of copper by modifying the adhesive polydopamine and then modifying the hydrophobic dodecyl mercaptan (1-DT) to form a hydrophobic surface. The successful preparation of the hydrophobic film was characterized by contact angle measurement near infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). The results of (SEM) show that the hydrophobic film has good corrosion inhibition ability to copper in seawater containing chloride ions. In addition, because silver nanoparticles have good antibacterial properties, silver nanoparticles are introduced on the surface of the hydrophobic film to delay the corrosion of copper caused by Escherichia coli. XPS was used to characterize the modification of silver nanoparticles, and SEM was used to show that the hydrophobic films modified by silver nanoparticles had good antibacterial properties. 1 4-PPM molecules were used as self-assembled molecules. The effects of different assembly time and different concentration of 4-PPM solution on the corrosion inhibition of copper were studied. When the assembly time is 6 h and the assembly concentration is 10-4, the corrosion inhibition efficiency is the highest, and the corrosion inhibition efficiency can reach 83.2.2 the hydrophobic surface with contact angle of 110 擄can be prepared by the modification of PDA and 1-DT. The hydrophobic surface is 1-DT acting on the cracks of PDA through the formation of Cu-S bond. The results of SEM showed that the corrosion resistance of the hydrophobic surface was good. (3) Silver nanoparticles were introduced into the hydrophobic film of PDA and 1-DT. The results of SEM showed that the composite film had a good antibacterial effect against Escherichia coli. The copper surface modified with silver nanoparticles contains the least amount of Escherichia coli.
【學(xué)位授予單位】：上海師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG174.4
本文編號(hào)：2399423
[Abstract]:Copper has excellent electrical conductivity, thermal conductivity, mechanical properties and formability, so copper as an important metal has been widely used in many fields. However, copper is a chemically active metal. Seawater contains not only chloride ions that can coordinate with copper, but also microorganisms that can corrode copper, such as Escherichia coli. Therefore, it is important to study the corrosion inhibition of copper in seawater. In this paper, the method of surface modification is mainly used. One is to form a self-assembled film on the surface of pyrimidine molecule 4-phenylpyrimidine (4-PPM) containing nitrogen atom. The corrosion inhibition property of the self-assembled film is characterized by electrochemical impedance and electrochemical polarization curves. The corrosion inhibition efficiency obtained by different methods is calculated by using the relevant formulas. By using density functional theory (DFT), the maximum molecular occupied orbital (HOMO) and the lowest molecular non-occupied orbital (LUMO) and dipole moments are calculated. Finally, the adsorption configuration and homogeneity of the self-assembled films on the electrode surface were measured by Raman spectroscopy. The other is based on the adhesion of polydopamine (PDA) to the surface of copper by modifying the adhesive polydopamine and then modifying the hydrophobic dodecyl mercaptan (1-DT) to form a hydrophobic surface. The successful preparation of the hydrophobic film was characterized by contact angle measurement near infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). The results of (SEM) show that the hydrophobic film has good corrosion inhibition ability to copper in seawater containing chloride ions. In addition, because silver nanoparticles have good antibacterial properties, silver nanoparticles are introduced on the surface of the hydrophobic film to delay the corrosion of copper caused by Escherichia coli. XPS was used to characterize the modification of silver nanoparticles, and SEM was used to show that the hydrophobic films modified by silver nanoparticles had good antibacterial properties. 1 4-PPM molecules were used as self-assembled molecules. The effects of different assembly time and different concentration of 4-PPM solution on the corrosion inhibition of copper were studied. When the assembly time is 6 h and the assembly concentration is 10-4, the corrosion inhibition efficiency is the highest, and the corrosion inhibition efficiency can reach 83.2.2 the hydrophobic surface with contact angle of 110 擄can be prepared by the modification of PDA and 1-DT. The hydrophobic surface is 1-DT acting on the cracks of PDA through the formation of Cu-S bond. The results of SEM showed that the corrosion resistance of the hydrophobic surface was good. (3) Silver nanoparticles were introduced into the hydrophobic film of PDA and 1-DT. The results of SEM showed that the composite film had a good antibacterial effect against Escherichia coli. The copper surface modified with silver nanoparticles contains the least amount of Escherichia coli.
【學(xué)位授予單位】：上海師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG174.4
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 林仲華,王逢春,田中群;2-氨基嘧啶對(duì)銅的緩蝕機(jī)理[J];物理化學(xué)學(xué)報(bào);1992年01期
，本文編號(hào)：2399423
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