碳鋼表面抗磨防腐涂層的研究
發(fā)布時(shí)間：2019-03-28 18:49
【摘要】：為了對比研究相同電參數(shù)下鋁酸鹽電解液體系和硅酸鹽電解液體系微弧氧化膜的（鋁酸鹽PEO膜和硅酸鹽PEO膜）生長機(jī)制，經(jīng)不同處理時(shí)間在低碳鋼表面制備了兩種體系的PEO膜。為了研究PEO膜對有機(jī)涂層防腐性能的影響，經(jīng)PEO前處理的復(fù)合有機(jī)涂層（PEO/organic）與未經(jīng)PEO前處理的有機(jī)涂層(organic)被制備。實(shí)驗(yàn)中記錄了電流-時(shí)間曲線；利用能譜儀（EDS）、X射線衍射儀（XRD）、掃描電子顯微鏡（SEM）分析了PEO膜層的成分組成及成分在厚度方向的分布規(guī)律、相組成和表面及截面形貌，PEO/organic涂層, organic涂層腐蝕前截面形貌及腐蝕后截面形貌和元素面分布。利用多功能材料表面性能檢測儀（MFT-4000）、沖擊測試儀、往復(fù)摩擦試驗(yàn)機(jī)（UMT-2MT）對PEO膜結(jié)合力、耐沖擊性、摩擦磨損性能進(jìn)行了檢驗(yàn)，并對磨痕、磨斑進(jìn)行了形貌表征。利用拉曼光譜儀對對偶陶瓷球磨斑、PEO膜與基體結(jié)合面化合物組成進(jìn)行了分析。利用電化學(xué)實(shí)驗(yàn)、鹽霧試驗(yàn)、浸泡實(shí)驗(yàn)對PEO/organic涂層, organic涂層防腐性能進(jìn)行了測試和驗(yàn)證。 結(jié)果表明，正電壓450V，負(fù)電壓100V，硅酸鹽PEO膜生長速度明顯較大且氧化膜內(nèi)外雙向生長，消耗基體材料較多，與基體結(jié)合面呈現(xiàn)參差交錯(cuò)狀；鋁酸鹽微弧氧化膜與基體結(jié)合面較平滑，消耗基體材料很少。鋁酸鹽PEO膜主要組成元素為O、Fe、Al，主要以Fe3O4和鐵鋁尖晶石（FeAl2O4）晶體形式存在，并且在膜層厚度方向分布均勻，無分層現(xiàn)象；而硅酸鹽PEO膜主要元素組成為Si、Fe、O，且以非晶態(tài)存在，厚度方向分布不均勻，出現(xiàn)分層現(xiàn)象。一定程度，元素分布的分層現(xiàn)象削弱了硅酸鹽微弧氧化膜的結(jié)合力。硅酸鹽PEO膜內(nèi)層主要組成化合物為Fe2O3，還有少量Fe3O4；鋁酸鹽PEO膜內(nèi)層則主要由Fe3O4和少量Fe2O3組成。形成初期不帶結(jié)晶水的Fe2O3會(huì)從電解液或空氣中吸收水分子，生成Fe2O3.nH2O導(dǎo)致底層體積膨脹，PEO膜自發(fā)剝離。鋁酸鹽PEO膜的摩擦系數(shù)和磨損率均小于硅酸鹽PEO膜的摩擦系數(shù)和磨損率，且對Si3N4陶瓷球?qū)ε嫉哪p小于硅酸鹽PEO膜。這主要可歸因于鋁酸鹽PEO膜與對偶摩擦過程中發(fā)生了Fe3O4的轉(zhuǎn)移，起到了一定程度的減摩抗磨作用。在硅酸鹽電解液中，正電壓240V，負(fù)電壓50V條件下，PEO/organic涂層、organic涂層在低碳鋼鋼片表面成功制備，PEO膜主要成分為Fe3O4、Fe2O3以及非晶態(tài)的硅氧化物，其本身具有一定耐腐蝕性。PEO膜與基體之間具有較強(qiáng)結(jié)合力，這是能作為有機(jī)涂層前處理的重要條件，多微孔多微裂紋的粗糙表面結(jié)構(gòu)有利于與有機(jī)涂層之間形成機(jī)械鎖合提高結(jié)合力，同時(shí)增大與有機(jī)涂層接觸面積，利于吸附更多有機(jī)涂料，形成更厚涂層。電化學(xué)腐蝕試驗(yàn)、鹽霧試驗(yàn)、浸泡實(shí)驗(yàn)結(jié)果顯示經(jīng)過微弧氧化前處理的有機(jī)涂層，其耐腐蝕性更好，使用壽命更長。因此，對于在碳鋼表面制備防腐有機(jī)涂層，，微弧氧化技術(shù)是一種很有前景的綠色環(huán)保前處理方法。
[Abstract]:In order to compare the growth mechanism of micro-arc oxidation film (aluminate PEO film and silicate PEO film) between aluminate electrolyte system and silicate electrolyte system under the same electric parameters, the PEO films of two systems were prepared on the surface of low carbon steel at different treatment time. In order to study the effect of PEO film on the corrosion resistance of organic coating, the composite organic coating (PEO/organic) pre-treated by PEO and the organic coating (organic) without PEO pre-treatment were prepared. The current-time curve is recorded in the experiment. (EDS), X-ray diffractometer (XRD), scanning electron microscope (SEM) was used to analyze the composition of PEO film and its distribution in thickness direction, phase composition, surface and cross-section morphology, and PEO/organic coating. The cross-section morphology and element surface distribution of organic coating before corrosion and after corrosion were investigated. The adhesion, impact resistance, friction and wear properties of PEO film were tested by multi-function material surface performance detector (MFT-4000), impact tester and reciprocating friction tester (UMT-2MT), and the wear marks and wear spots were characterized. The composition of dual ceramic ball wear spot, PEO film and matrix compound were analyzed by Raman spectroscopy. The anticorrosive properties of PEO/organic coating and organic coating were tested and verified by electrochemical test, salt spray test and immersion test. The results show that the positive voltage 450V and negative voltage 100V, the growth rate of silicate PEO film is obviously larger and the oxide film grows in two directions inside and outside the oxide film, the matrix material is consumed more, and the interface with the substrate is staggered. The interface between Aluminate micro-arc oxidation film and matrix is smooth, and the consumption of matrix material is little. The main composition elements of aluminate PEO film are O, Fe, Al, mainly in the form of Fe3O4 and FeAl2O4 crystal, and distribute uniformly in the thickness direction of the film, and there is no delamination phenomenon. On the other hand, the main elements of silicate PEO film are Si,Fe,O, and exist in amorphous state, the thickness distribution is not uniform, and there is delamination phenomenon. To a certain extent, the stratification phenomenon of element distribution weakens the binding force of silicate micro-arc oxide film. The main compounds in the inner layer of silicate PEO film are Fe2O3, and a small amount of Fe3O4; aluminate PEO film. The inner layer of silicate PEO film is mainly composed of Fe3O4 and a small amount of Fe2O3. In the initial stage, Fe2O3 without crystalline water absorbs water molecules from the electrolyte or air, resulting in the expansion of the bottom layer volume and the spontaneous stripping of the PEO film, resulting in the formation of Fe2O3.nH2O. The friction coefficient and wear rate of aluminate PEO film are lower than that of silicate PEO film, and the dual wear of Si3N4 ceramic ball is smaller than that of silicate PEO film. This can be attributed to the transfer of Fe3O4 in the process of dual friction between aluminate PEO film and dual friction, which play a certain degree of friction and anti-wear effect. In silicate electrolyte, under the condition of positive voltage 240V and negative voltage 50V, PEO/organic coating and organic coating were successfully prepared on the surface of low carbon steel sheet. The main composition of PEO film was Fe3O4,Fe2O3 and amorphous silicon oxide. The PEO film has strong adhesion to the substrate, which is an important condition for pre-treatment of organic coatings. The rough surface structure of micropores and microcracks is conducive to the formation of mechanical locking with organic coatings to improve the adhesion and increase the area of contact with the organic coatings, which is conducive to the adsorption of more organic coatings and the formation of thicker coatings. The results of electrochemical corrosion test, salt spray test and immersion test show that the organic coatings treated before micro-arc oxidation have better corrosion resistance and longer service life. Therefore, micro-arc oxidation is a promising green pretreatment method for the preparation of anticorrosive organic coatings on carbon steel surface.
【學(xué)位授予單位】：華東交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.4
[Abstract]:In order to compare the growth mechanism of micro-arc oxidation film (aluminate PEO film and silicate PEO film) between aluminate electrolyte system and silicate electrolyte system under the same electric parameters, the PEO films of two systems were prepared on the surface of low carbon steel at different treatment time. In order to study the effect of PEO film on the corrosion resistance of organic coating, the composite organic coating (PEO/organic) pre-treated by PEO and the organic coating (organic) without PEO pre-treatment were prepared. The current-time curve is recorded in the experiment. (EDS), X-ray diffractometer (XRD), scanning electron microscope (SEM) was used to analyze the composition of PEO film and its distribution in thickness direction, phase composition, surface and cross-section morphology, and PEO/organic coating. The cross-section morphology and element surface distribution of organic coating before corrosion and after corrosion were investigated. The adhesion, impact resistance, friction and wear properties of PEO film were tested by multi-function material surface performance detector (MFT-4000), impact tester and reciprocating friction tester (UMT-2MT), and the wear marks and wear spots were characterized. The composition of dual ceramic ball wear spot, PEO film and matrix compound were analyzed by Raman spectroscopy. The anticorrosive properties of PEO/organic coating and organic coating were tested and verified by electrochemical test, salt spray test and immersion test. The results show that the positive voltage 450V and negative voltage 100V, the growth rate of silicate PEO film is obviously larger and the oxide film grows in two directions inside and outside the oxide film, the matrix material is consumed more, and the interface with the substrate is staggered. The interface between Aluminate micro-arc oxidation film and matrix is smooth, and the consumption of matrix material is little. The main composition elements of aluminate PEO film are O, Fe, Al, mainly in the form of Fe3O4 and FeAl2O4 crystal, and distribute uniformly in the thickness direction of the film, and there is no delamination phenomenon. On the other hand, the main elements of silicate PEO film are Si,Fe,O, and exist in amorphous state, the thickness distribution is not uniform, and there is delamination phenomenon. To a certain extent, the stratification phenomenon of element distribution weakens the binding force of silicate micro-arc oxide film. The main compounds in the inner layer of silicate PEO film are Fe2O3, and a small amount of Fe3O4; aluminate PEO film. The inner layer of silicate PEO film is mainly composed of Fe3O4 and a small amount of Fe2O3. In the initial stage, Fe2O3 without crystalline water absorbs water molecules from the electrolyte or air, resulting in the expansion of the bottom layer volume and the spontaneous stripping of the PEO film, resulting in the formation of Fe2O3.nH2O. The friction coefficient and wear rate of aluminate PEO film are lower than that of silicate PEO film, and the dual wear of Si3N4 ceramic ball is smaller than that of silicate PEO film. This can be attributed to the transfer of Fe3O4 in the process of dual friction between aluminate PEO film and dual friction, which play a certain degree of friction and anti-wear effect. In silicate electrolyte, under the condition of positive voltage 240V and negative voltage 50V, PEO/organic coating and organic coating were successfully prepared on the surface of low carbon steel sheet. The main composition of PEO film was Fe3O4,Fe2O3 and amorphous silicon oxide. The PEO film has strong adhesion to the substrate, which is an important condition for pre-treatment of organic coatings. The rough surface structure of micropores and microcracks is conducive to the formation of mechanical locking with organic coatings to improve the adhesion and increase the area of contact with the organic coatings, which is conducive to the adsorption of more organic coatings and the formation of thicker coatings. The results of electrochemical corrosion test, salt spray test and immersion test show that the organic coatings treated before micro-arc oxidation have better corrosion resistance and longer service life. Therefore, micro-arc oxidation is a promising green pretreatment method for the preparation of anticorrosive organic coatings on carbon steel surface.
【學(xué)位授予單位】：華東交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.4
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 羅軍;鄭健峰;莫繼良;何莉萍;朱e
本文編號(hào)：2449139
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