碳钢表面抗磨防腐涂层的研究
发布时间：2019-03-28 18:49
【摘要】：为了对比研究相同电参数下铝酸盐电解液体系和硅酸盐电解液体系微弧氧化膜的（铝酸盐PEO膜和硅酸盐PEO膜）生长机制，经不同处理时间在低碳钢表面制备了两种体系的PEO膜。为了研究PEO膜对有机涂层防腐性能的影响，经PEO前处理的复合有机涂层（PEO/organic）与未经PEO前处理的有机涂层(organic)被制备。实验中记录了电流-时间曲线；利用能谱仪（EDS）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）分析了PEO膜层的成分组成及成分在厚度方向的分布规律、相组成和表面及截面形貌，PEO/organic涂层, organic涂层腐蚀前截面形貌及腐蚀后截面形貌和元素面分布。利用多功能材料表面性能检测仪（MFT-4000）、冲击测试仪、往复摩擦试验机（UMT-2MT）对PEO膜结合力、耐冲击性、摩擦磨损性能进行了检验，并对磨痕、磨斑进行了形貌表征。利用拉曼光谱仪对对偶陶瓷球磨斑、PEO膜与基体结合面化合物组成进行了分析。利用电化学实验、盐雾试验、浸泡实验对PEO/organic涂层, organic涂层防腐性能进行了测试和验证。 结果表明，正电压450V，负电压100V，硅酸盐PEO膜生长速度明显较大且氧化膜内外双向生长，消耗基体材料较多，与基体结合面呈现参差交错状；铝酸盐微弧氧化膜与基体结合面较平滑，消耗基体材料很少。铝酸盐PEO膜主要组成元素为O、Fe、Al，主要以Fe3O4和铁铝尖晶石（FeAl2O4）晶体形式存在，并且在膜层厚度方向分布均匀，无分层现象；而硅酸盐PEO膜主要元素组成为Si、Fe、O，且以非晶态存在，厚度方向分布不均匀，出现分层现象。一定程度，元素分布的分层现象削弱了硅酸盐微弧氧化膜的结合力。硅酸盐PEO膜内层主要组成化合物为Fe2O3，还有少量Fe3O4；铝酸盐PEO膜内层则主要由Fe3O4和少量Fe2O3组成。形成初期不带结晶水的Fe2O3会从电解液或空气中吸收水分子，生成Fe2O3.nH2O导致底层体积膨胀，PEO膜自发剥离。铝酸盐PEO膜的摩擦系数和磨损率均小于硅酸盐PEO膜的摩擦系数和磨损率，且对Si3N4陶瓷球对偶的磨损小于硅酸盐PEO膜。这主要可归因于铝酸盐PEO膜与对偶摩擦过程中发生了Fe3O4的转移，起到了一定程度的减摩抗磨作用。在硅酸盐电解液中，正电压240V，负电压50V条件下，PEO/organic涂层、organic涂层在低碳钢钢片表面成功制备，PEO膜主要成分为Fe3O4、Fe2O3以及非晶态的硅氧化物，其本身具有一定耐腐蚀性。PEO膜与基体之间具有较强结合力，这是能作为有机涂层前处理的重要条件，多微孔多微裂纹的粗糙表面结构有利于与有机涂层之间形成机械锁合提高结合力，同时增大与有机涂层接触面积，利于吸附更多有机涂料，形成更厚涂层。电化学腐蚀试验、盐雾试验、浸泡实验结果显示经过微弧氧化前处理的有机涂层，其耐腐蚀性更好，使用寿命更长。因此，对于在碳钢表面制备防腐有机涂层，，微弧氧化技术是一种很有前景的绿色环保前处理方法。
[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.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：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.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG174.4
【参考文献】
相关期刊论文 前10条
1 罗军;郑健峰;莫继良;何莉萍;朱e
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