帶銹表面的預(yù)處理及其匹配環(huán)氧涂層的應(yīng)用研究
發(fā)布時間：2019-02-18 16:24
【摘要】：近年來,人們一直被涂裝前金屬表面帶銹的問題所困擾。由于鐵銹成分的復(fù)雜性與多樣性,它不僅會影響涂層的附著力,還會影響涂層的耐腐蝕性,所以需要對表面銹層進(jìn)行清除。而傳統(tǒng)的除銹方法會造成環(huán)境污染,成本增加等問題,因此關(guān)于直接在銹層上涂裝的方法成為了研究熱點(diǎn)。以往的研究主要采用磷酸、單寧酸對銹層進(jìn)行處理,其不足之處是不能滲入到多孔銹層的內(nèi)部,并且酸量也很難控制。針對這些問題,本論文選擇了具有高表面活性的全氟辛酸銨(PFOA)進(jìn)行了研究,圍繞其與銹層的作用開展了工作,研究內(nèi)容和結(jié)果如下:(1)采用全氟辛酸銨溶液對帶銹表面進(jìn)行浸漬處理,對處理后的表面采用傅里葉變換紅外光譜(FT-IR)、能譜儀(EDS)、掃描電子顯微鏡(SEM)、激光共聚焦掃描顯微鏡、接觸角及電化學(xué)極化曲線等檢測手段,對其結(jié)構(gòu)、元素成分、表面微觀形貌、潤濕性及耐蝕性進(jìn)行表征。結(jié)果表明,全氟辛酸銨溶液是具有較好擴(kuò)散性和潤濕性的中性溶液,能夠滲入多孔的銹層到達(dá)基材表面,形成吸附膜,破壞銹層與基材的結(jié)合作用。此外,濃度為150g/L時的全氟辛酸銨溶液對帶銹表面的處理是優(yōu)于其它濃度的。(2)雖然全氟辛酸銨溶液的潤濕性與滲透性很好,但對帶銹表面的耐蝕性和粘結(jié)性提高不顯著,同時考慮到硅烷偶聯(lián)劑具有無污染、適用廣泛、成膜效果好、對有機(jī)涂層粘結(jié)性能優(yōu)異等優(yōu)點(diǎn),所以本論文將全氟辛酸銨溶液與硅烷偶聯(lián)劑(KH550、KH560)相混合使二者產(chǎn)生協(xié)同作用,對帶銹表面進(jìn)行浸漬處理后,再對表面進(jìn)行加熱使其固化成膜,對制成的表面膜進(jìn)行性能檢測以確定最佳水解、固化工藝參數(shù)。檢測結(jié)果表明:PFOA/KH550膜與PFOA/KH560膜表面都發(fā)生了聚合交聯(lián)反應(yīng),且PFOA/KH550膜與基材表面結(jié)合的更強(qiáng)些;當(dāng)KH550與PFOA的質(zhì)量比為1:1,KH550的溶液濃度為10%,固化時間為1.5h,固化溫度為150℃時所制得的表面膜與其它工藝下所制得的膜相比,厚度最大、對金屬基體的包覆率最大、膜的封閉性最好、潤濕性適中、耐蝕性顯著提升;無論是在不同水解工藝下還是在不同固化工藝下,所制得的PFOA/KH550膜的各性能都要優(yōu)于PFOA/KH560膜。(3)對帶銹表面進(jìn)行預(yù)處理的最終目的是與涂層相匹配,本論文研究了三類不同預(yù)處理后的表面(未經(jīng)處理的帶銹表面、經(jīng)KH550/PFOA混合溶液處理的帶銹表面、經(jīng)KH560/PFOA混合溶液處理的帶銹表面)與環(huán)氧有機(jī)涂層的匹配效果。研究結(jié)果表明:經(jīng)KH550/PFOA溶液處理的表面涂層的各項(xiàng)機(jī)械性能是優(yōu)于其它兩類的;表面涂層在經(jīng)過鹽水浸泡62d后,只有KH550/PFOA溶液處理的表面涂層破壞最小,只產(chǎn)生微變色;涂層試樣經(jīng)拉拔試驗(yàn)后發(fā)現(xiàn),經(jīng)KH550/PFOA溶液處理的表面與環(huán)氧有機(jī)涂層的附著力要高于其它兩種表面;而且其表面涂層的腐蝕電流密度與其它兩種相比顯著下降,因而具有最優(yōu)的防腐效果。
[Abstract]:In recent years, people have been plagued by the problem of rust on the metal surface before painting. Because of the complexity and diversity of the rust component, it not only affects the adhesion of the coating, but also affects the corrosion resistance of the coating, so it is necessary to clean the surface rust layer. The traditional method of derusting can cause the problems of environmental pollution and cost, so the method of coating directly on the rust layer has become a hot spot. In the past, phosphoric acid and tannic acid are used to treat the rust layer, and the disadvantage is that it is not allowed to penetrate into the inside of the porous rust layer, and the amount of the acid is also difficult to control. In order to solve these problems, the paper chose the perfluorooctanoic acid solution (PFOA) with high surface activity, and carried out the work around it and the rust layer, and the contents and results were as follows: (1) The dipping treatment of the stainless steel surface was carried out by using the perfluorooctanoic acid solution. Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), laser confocal scanning microscope, contact angle and electrochemical polarization curve were used to detect the surface of the treated surface, and the structure, element composition and surface micro-morphology of the treated surface were measured by Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), laser confocal scanning microscope, contact angle and electrochemical polarization curve. and the wettability and the corrosion resistance are characterized. The results show that the perfluorooctanoic acid solution is a neutral solution with good diffusibility and wettability, can penetrate the porous rust layer to reach the surface of the base material, form the adsorption film, and destroy the binding action of the rust layer and the base material. In addition, the solution of the perfluorooctanoic acid solution at a concentration of 150g/ L was superior to the other concentration for the treatment with the rust surface. (2) Although the wettability and the permeability of the perfluorooctanoic acid solution are good, the corrosion resistance and the adhesion to the stainless steel surface are not significant, and the silane coupling agent has the advantages of no pollution, wide application, good film-forming effect, excellent adhesive property of the organic coating and the like, The method comprises the following steps of: mixing a perfluorooctanoic acid solution and a silane coupling agent (KH550, KH560) to generate a synergistic effect, carrying out dipping treatment on the stainless steel surface, heating the surface to form a film, performing performance detection on the prepared surface film to determine the optimal hydrolysis, Curing process parameters. The results show that the PFOA/ KH550 film and the surface of the PFOA/ KH560 film have a polymerization crosslinking reaction, and the PFOA/ KH550 film is stronger than the surface of the substrate; when the mass ratio of the KH550 to the PFOA is 1: 1, the solution concentration of the KH550 is 10%, and the curing time is 1. 5h, the surface film prepared when the curing temperature is 150 DEG C is the largest in thickness, the coating rate of the metal matrix is the largest, the sealing property of the film is the best, the wettability is moderate, and the corrosion resistance is obviously improved; whether under different hydrolysis processes or under different curing processes, The performance of the prepared PFOA/ KH550 film is superior to that of the PFOA/ KH560 film. (3) The final purpose of pre-treatment on the surface of the stainless steel was to match the coating, and the surface of three kinds of pre-treatment (the surface of the surface without treatment, the surface with the rust treated with KH550/ PFOA mixed solution) was studied in this paper. The matching effect of the rusted surface treated with KH560/ PFOA mixed solution and the epoxy organic coating. The results show that the mechanical properties of the surface coatings treated with the KH550/ PFOA solution are superior to those of the other two types. The surface coatings treated with the KH550/ PFOA solution only have the least damage to the surface coating treated by the KH550/ PFOA solution and only produce the micro-color change; after the coating sample is subjected to the drawing test, The adhesion between the surface treated by KH550/ PFOA solution and the epoxy organic coating is higher than that of the other two surfaces.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4
本文編號：2426017
[Abstract]:In recent years, people have been plagued by the problem of rust on the metal surface before painting. Because of the complexity and diversity of the rust component, it not only affects the adhesion of the coating, but also affects the corrosion resistance of the coating, so it is necessary to clean the surface rust layer. The traditional method of derusting can cause the problems of environmental pollution and cost, so the method of coating directly on the rust layer has become a hot spot. In the past, phosphoric acid and tannic acid are used to treat the rust layer, and the disadvantage is that it is not allowed to penetrate into the inside of the porous rust layer, and the amount of the acid is also difficult to control. In order to solve these problems, the paper chose the perfluorooctanoic acid solution (PFOA) with high surface activity, and carried out the work around it and the rust layer, and the contents and results were as follows: (1) The dipping treatment of the stainless steel surface was carried out by using the perfluorooctanoic acid solution. Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), laser confocal scanning microscope, contact angle and electrochemical polarization curve were used to detect the surface of the treated surface, and the structure, element composition and surface micro-morphology of the treated surface were measured by Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), laser confocal scanning microscope, contact angle and electrochemical polarization curve. and the wettability and the corrosion resistance are characterized. The results show that the perfluorooctanoic acid solution is a neutral solution with good diffusibility and wettability, can penetrate the porous rust layer to reach the surface of the base material, form the adsorption film, and destroy the binding action of the rust layer and the base material. In addition, the solution of the perfluorooctanoic acid solution at a concentration of 150g/ L was superior to the other concentration for the treatment with the rust surface. (2) Although the wettability and the permeability of the perfluorooctanoic acid solution are good, the corrosion resistance and the adhesion to the stainless steel surface are not significant, and the silane coupling agent has the advantages of no pollution, wide application, good film-forming effect, excellent adhesive property of the organic coating and the like, The method comprises the following steps of: mixing a perfluorooctanoic acid solution and a silane coupling agent (KH550, KH560) to generate a synergistic effect, carrying out dipping treatment on the stainless steel surface, heating the surface to form a film, performing performance detection on the prepared surface film to determine the optimal hydrolysis, Curing process parameters. The results show that the PFOA/ KH550 film and the surface of the PFOA/ KH560 film have a polymerization crosslinking reaction, and the PFOA/ KH550 film is stronger than the surface of the substrate; when the mass ratio of the KH550 to the PFOA is 1: 1, the solution concentration of the KH550 is 10%, and the curing time is 1. 5h, the surface film prepared when the curing temperature is 150 DEG C is the largest in thickness, the coating rate of the metal matrix is the largest, the sealing property of the film is the best, the wettability is moderate, and the corrosion resistance is obviously improved; whether under different hydrolysis processes or under different curing processes, The performance of the prepared PFOA/ KH550 film is superior to that of the PFOA/ KH560 film. (3) The final purpose of pre-treatment on the surface of the stainless steel was to match the coating, and the surface of three kinds of pre-treatment (the surface of the surface without treatment, the surface with the rust treated with KH550/ PFOA mixed solution) was studied in this paper. The matching effect of the rusted surface treated with KH560/ PFOA mixed solution and the epoxy organic coating. The results show that the mechanical properties of the surface coatings treated with the KH550/ PFOA solution are superior to those of the other two types. The surface coatings treated with the KH550/ PFOA solution only have the least damage to the surface coating treated by the KH550/ PFOA solution and only produce the micro-color change; after the coating sample is subjected to the drawing test, The adhesion between the surface treated by KH550/ PFOA solution and the epoxy organic coating is higher than that of the other two surfaces.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 肖進(jìn)新,江洪;碳氟表面活性劑[J];日用化學(xué)工業(yè);2001年05期
，本文編號：2426017
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