發(fā)布時間：2018-05-07 06:50

  本文選題：環(huán)氧樹脂 + 防腐抗沖蝕磨損涂層�。� 參考：《西華大學(xué)》2017年碩士論文

【摘要】：水力機(jī)械在服役過程中,因受到嚴(yán)重的沖蝕磨損及腐蝕破壞,導(dǎo)致了大量機(jī)械零部件被破壞與失效,使得國民經(jīng)濟(jì)損失慘重。因此,對水力機(jī)械過流部件的抗腐蝕與沖蝕磨損性能要求越來越高。這樣一來,研發(fā)具有較高耐沖蝕磨損和抗腐蝕性能的涂層,對于保護(hù)易損部件、降低能耗、節(jié)約材料、減少工業(yè)生產(chǎn)中安全事故的發(fā)生、提高工業(yè)生產(chǎn)效率就具有重要意義。針對現(xiàn)有環(huán)氧復(fù)合涂層研究中存在的不足,本文首先合成出端環(huán)氧基聚氨酯彈性體增韌劑(ETPU),研究ETPU增韌劑對環(huán)氧涂層力學(xué)及抗沖蝕磨損性能的影響;在此基礎(chǔ)上,進(jìn)一步考察SiC表面改性及改性SiC含量對EP/ETPU復(fù)合涂層沖蝕磨損及抗腐蝕性能的影響;最后探討了改性玻璃纖維對EP/ETPU/改性SiC復(fù)合涂層力學(xué)和耐沖蝕磨損性能的影響。主要研究內(nèi)容及結(jié)果如下:(1)合成一種端環(huán)氧基聚氨酯彈性體增韌劑(ETPU),研究ETPU對環(huán)氧涂層力學(xué)及抗沖蝕磨損性能的影響。結(jié)果表明:一定含量的聚氨酯可以提高EP/ETPU共混物的粘接強(qiáng)度;共混物的缺口沖擊性能隨著ETPU含量的增加而出現(xiàn)先增大后降低的趨勢,且ETPU2000的增韌效果要好于ETPU1000;純EP常溫固化DSC曲線出現(xiàn)典型的放熱峰,表明常溫條件下純EP固化不完全,但是加熱固化后的DSC曲線無此特征,表明固化反應(yīng)完全;隨著ETPU2000含量的增加,復(fù)合材料玻璃化轉(zhuǎn)變溫度向低溫移動,并且均低于純EP加熱固化后的玻璃化轉(zhuǎn)變溫度;ETPU2000能夠顯著提高EP涂層的抗沖蝕磨損性能,其沖蝕磨損失重量在ETPU2000含量為15%時達(dá)到最小。(2)對SiC進(jìn)行表面改性,考察改性SiC及其用量對EP/ETPU復(fù)合涂層力學(xué)和耐沖蝕磨損的影響。將改性SiC加入到EP/ETPU體系中后,涂層的粘接強(qiáng)度所有下降。同時EP/ETPU/改性Si C復(fù)合涂層的沖擊強(qiáng)度也隨著改性SiC的增加而下降;隨著改性SiC含量的增加,硬度先上升后下降,在改性SiC含量為60%時達(dá)到最大值13.5HB;改性SiC顆粒能夠顯著提高EP/ETPU涂層的抗沖蝕磨損性能,其沖蝕磨損失重在改性SiC含量為60%時達(dá)到最小。(3)在(2)的基礎(chǔ)上,進(jìn)一步考察涂層固化工藝、SiC表面改性及其含量對環(huán)氧復(fù)合涂層抗腐蝕行為的影響。結(jié)果表明:加熱固化后復(fù)合涂層的抗腐蝕性能較好,而常溫固化體系對金屬的保護(hù)較弱,涂層/金屬界面易剝離,酸性介質(zhì)容易進(jìn)入金屬表面。SiC表面改性后引入了親油性硅氧烷結(jié)構(gòu)且其表面的環(huán)氧基團(tuán)與固化劑反應(yīng),使得涂層對酸性腐蝕介質(zhì)屏蔽作用增強(qiáng)。當(dāng)改性SiC含量為60%時涂層抗腐蝕性能最佳,經(jīng)腐蝕液浸泡240h后,復(fù)合涂層的容抗弧半徑、低頻阻抗值均較大,腐蝕電流密度和自腐蝕電位較小。(4)考察改性GF對EP/ETPU/改性SiC復(fù)合涂層沖蝕磨損性能的影響,結(jié)果表明:隨著改性GF含量的增加,復(fù)合涂層粘接強(qiáng)度與沖擊強(qiáng)度均表現(xiàn)出先上升后略有下降的趨勢。沖蝕磨損性能及沖蝕面SEM測試表明,隨著改性GF的增加,復(fù)合涂層的沖蝕磨損失重量先下降后上升。當(dāng)改性GF添加量為8%時,其在復(fù)合涂層中分散效果最好,同時還能夠有效的吸收沖蝕能量,阻止裂紋擴(kuò)展,減緩疲勞斷裂等。最后得到較好的防腐抗沖蝕環(huán)氧復(fù)合涂層的配方為EP+15%ETPU2000+60%改性SiC+8%改性GF。
[Abstract]:In the course of service, the hydraulic machinery has been damaged and destroyed by serious erosion and erosion, resulting in the destruction and failure of a large number of mechanical parts, which makes the national economic loss heavy. Therefore, the corrosion resistance and erosion wear resistance of the hydraulic machinery parts are more and more demanding. This makes the research and development have high erosion resistance and corrosion resistance. The corrosion resistance coating is of great significance for protecting vulnerable parts, reducing energy consumption, saving materials, reducing the occurrence of safety accidents in industrial production and improving industrial production efficiency. In view of the shortcomings existing in the existing epoxy composite coatings, this paper first synthesizes the end ring oxygen based polyurethane elastomer toughening agent (ETPU) to study the toughening of ETPU. The effect of the agent on the mechanical and erosion resistance of epoxy coating was studied. On this basis, the effect of the surface modification of SiC and the content of modified SiC on the erosion wear and corrosion resistance of the EP/ETPU composite coating was further investigated. Finally, the influence of modified glass fiber on the mechanical and erosion resistance of EP/ETPU/ modified SiC composite coating was discussed. The contents and results are as follows: (1) an epoxy based polyurethane elastomer (ETPU) was synthesized, and the effect of ETPU on the mechanical and erosion resistance of epoxy coating was studied. The results showed that a certain amount of polyurethane could improve the bonding strength of the EP/ETPU blends; the notch impact properties of the blends appeared first with the increase of the content of ETPU. The toughening effect of ETPU2000 is better than that of ETPU1000, and the typical exothermic peak of the DSC curve of pure EP at normal temperature shows that the pure EP curing under normal temperature is not complete, but the DSC curve after heating is not characteristic, indicating that the curing reaction is complete; with the increase of ETPU2000 content, the glass transition temperature of the composite material is to the point. The low temperature movement is lower than the glass transition temperature after the pure EP heating. ETPU2000 can significantly improve the corrosion resistance and wear resistance of the EP coating, and the weight of the erosion wear loss reaches the minimum when the ETPU2000 content is 15%. (2) the surface modification of SiC is carried out, and the modified SiC and its dosage on the mechanical and erosion resistance of the EP/ETPU composite coating are investigated. After adding the modified SiC to the EP/ETPU system, the adhesion strength of the coating decreased. Meanwhile, the impact strength of the EP/ETPU/ modified Si C composite coating decreased with the increase of the modified SiC. With the increase of the modified SiC content, the hardness increased first and then decreased, and the maximum 13.5HB was reached when the modified SiC content was 60%; the modified SiC particles could be displayed. In order to improve the erosion resistance of EP/ETPU coating, its erosion wear loss is minimum when the modified SiC content is 60%. (3) on the basis of (2), the effect of the coating curing process, the surface modification and the content of SiC on the corrosion resistance of the epoxy composite coating are further investigated. The results show that the corrosion resistance of the composite coating after heating and curing is more than that of the coating. The protection of metal at normal temperature is weak, the coating / metal interface is easily stripped and the acid medium easily enters the metal surface. After the surface modification, the structure of the.SiC is introduced and the epoxy group on the surface is reacted with the curing agent, which makes the coating enhance the shielding effect of the acid corrosion medium. When the content of the modified SiC is 60%, the coating is coated. The corrosion resistance is the best. After the corrosion solution is soaked for 240h, the resistance arc radius of the composite coating, the low frequency impedance value are larger, the corrosion current density and the self corrosion potential are smaller. (4) the effect of modified GF on the erosion and wear properties of the EP/ETPU/ modified SiC composite coating is investigated. The results show that the adhesive strength and impact of the composite coating increase with the increase of the modified GF content. The erosion strength and the erosion surface SEM test showed that the erosion wear weight of the composite coating decreased first and then increased with the increase of the modified GF. When the modified GF was added to 8%, the dispersion effect in the composite coating was best, and the erosion energy was effectively absorbed and prevented. Finally, a better anticorrosive and erosion resistant epoxy composite coating was formulated with EP+15%ETPU2000+60% modified SiC+8% modified GF..

【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.4

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