二硫化钼滚动涂覆工艺研究

本文研究了紧固件二硫化钼干膜润滑剂滚动涂覆的工艺,并介绍了涂覆工艺参数、二硫化钼固体份含量对膜层厚度、外观质量的影响。研究结果表明,在所选定的工艺参数条件下,滚动涂覆方法制得的膜层厚度和外观质量等指标均满足技术条件要求。     

钛材表面生成“活性膜”的研究

介绍了钛(TA_2)和钛合金(TC_1)经活化处理,生成“活性膜”的工艺。通过光电子能谱分析,确定了“活性膜”为 TiH_2,并探讨了“活性膜”的生成机理及在“活性膜”上直接电镀的可行性。关键词钛钛合金活性膜电镀     

聚偏氟乙烯纳滤膜制备及其处理模拟活性黑废水

为研制适用于染料废水处理的新型纳滤膜,以自制的PVDF膜为基膜,通过溶胶-凝胶方法在膜表面涂覆TiO2纳米颗粒层,然后再涂敷多巴胺/PEI层,以制备PVDF纳滤膜.考察了制备条件对膜的表面特性及过滤性能的影响.结果表明,TiO2和多巴胺/PEI可以顺序的涂覆在PVDF膜表面.表面涂覆后,膜的通量急剧下降,截留率大幅度上...     

KH570对二硫化钼粉体表面的改性研究

二硫化钼(MoS2)是常用的耐磨无机填料,在加入聚合物基体之前先通常进行表面改性而提高其在聚合物中的分散性和界面相容性.选用硅烷偶联剂(KH570)为改性剂,采用湿法改性工艺对MoS2粉体进行表面改性,通过MoS2粉体悬浮液的浊度、活化指数等性能分析,表明改性后的MoS2粉体疏水亲油性提高.FT-IR及XRD的结构表征表明改性后的MoS2晶体结构未发生改变,粉体粒子表面成功地被KH570包覆.     

MoS2-PAN吸附膜对铜离子的吸附性能影响规律

利用聚丙烯腈(PAN)为基膜、硫化钼(MoS2)为改性剂制备MoS2-PAN有机-无机复合膜.利用PAN基膜对重金属离子进行选择性、PAN固含量以及温度因素进行吸附性能实验,并通过SEM、FTIR进行表征.在此条件下,通过添加MoS2提高吸附膜材料对Cu2+的吸附能力,分别改变MoS2固含量、pH值、温度、反应时间得到最优吸附量,并通过动力学拟合曲线、等温吸附模型以及热力学模型确定反应机理,并通过解吸实验考察吸附膜解吸再生效应.结果表明:在温度为30℃,pH=6的条件下添加MoS21wt％对Cu2+吸附180 min吸附性能达到最优,Langmuir等温吸附模型更符合该吸附过程,准二级动力学模型更符合该吸附的动力学过程.吸附是一个自发的吸热过程.     

长效流滴功能膜工业化生产的研究

介绍了一种新型的特殊防流滴涂覆液.在三层共挤棚膜生产装置上,研究了表面处理、涂覆量的控制、烘干等工艺条件对薄膜性能的影响.实现了在线工业化生产涂覆型流滴、消雾、耐候功能膜.在各种工艺条件下对薄膜的流滴持效性作了研究,确保了薄膜的流滴持效期达12个月以上.     

复合氧化工艺对医用钛合金耐蚀性和耐磨性的影响

采用阳极氧化和热氧化相结合的复合氧化工艺对医用钛合金进行氧化处理,研究了氧化液的组成和热氧化温度对钛合金氧化膜表面形貌,耐蚀性和耐磨性能的影响。实验结果表明,复合氧化工艺可以提高钛合金表面的耐蚀性能和弹性模量,改善了钛合金的耐磨损性能。     

锌铬膜黑化技术的研究与应用

介绍了锌铬膜黑化工艺的研究与应用,锌铬膜黑化工艺有效地解决了传统锌铬膜涂覆黑色油漆层导致紧固件摩擦系数无法控制、平面间涂层不均匀的问题,同时该黑化工艺的膜层还具有比在锌铬膜层中掺杂黑色颜料工艺的膜层更好的耐蚀性能.     

一种去除钛及钛合金微弧氧化膜的碱性退膜液

为了减少钛及钛合金材料表面处理过程中的吸氢和满足清洁生产的要求,研制开发了一种用于去除钛及钛合金微弧阳极氧化膜的碱性退膜液,对这种退膜液的退膜效果和稳定性能进行了研究,并进一步考察了退膜液对钛及钛合金基体的腐蚀性能、退膜后重新微弧氧化的难易以及微弧氧化膜与基体的结合情况。实验表明:该退膜液具有退膜效果好、稳定性能好、不影响上膜及膜层与基体结合的特点,为完善钛及钛合金微弧氧化工艺及其它钛及钛合金阳极氧化膜退膜液的开发提供了有价值的参考。     

溶胶-凝胶法制备薄膜的研究进展

溶胶-凝胶工艺是一种很有前途的薄膜制备方法.简单介绍了薄膜的种类及制作方法.将溶胶-凝胶法与PVD法和CVD法等进行了比较,说明了其制膜的优点,如工艺简单、设备要求低以及适合于大面积制膜.具体介绍了用溶胶-凝胶法制膜的流程及应用,着重介绍了基片的清洗方法和薄膜的涂覆方法.     

钛合金高温防氧化玻璃-陶瓷涂料的制备及表征

利用浸涂法在TC4钛合金表面制备了高温防氧化玻璃-陶瓷涂层。采用金相观察(OM)、扫描电镜(SEM)、X射线衍射(XRD)、电子探针分析(EPMA)对其性能进行了表征。该涂料是以硅酸盐玻璃为主体,硅酸钠为粘结剂制备而成的料浆悬浮体。在500～1 000℃的温度范围内,与没有涂层保护的基体相比,在涂层保护下基体的氧化程度至少可减轻85%。研究表明:随温度升高,涂层逐渐熔融,得到一层致密的保护层,涂层中依次出现Al2O3、TiO2、硅酸盐、钛铝、硅铝化合物等物相,使得涂层具有很好的高温流动性和稳定性,有效阻挡了氧气对基体的侵蚀,且涂层对基体的沾污甚微。涂层与基体的热膨胀系数(CTE)失配达到87%,涂层在使用后可以实现完全自剥落。     

Corrosion behaviors of Zn/Al-Mn alloy composite coatings deposited on magnesium alloy AZ31B (Mg-Al-Zn)

After being pre-plated a zinc layer, an amorphous Al-Mn alloy coating was applied onto the surface of AZ31B magnesium alloy with a bath of molten salts. Then the corrosion performance of the coated magnesium alloy was examined in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the single Zn layer was active in the test solution with a high corrosion rate while the Al-Mn alloy coating could effectively protect AZ31B magnesium alloy from corrosion in the solution. The high corrosion resistance of Al-Mn alloy coating was ascribed to an intact and stable passive film formed on the coating. The performances of the passive film on Al-Mn alloy were further investigated by Mott-Schottky curve and X-ray photoelectron spectroscopy (XPS) analysis. It was confirmed that the passive film exhibited n-type semiconducting behavior in 3.5% NaCl solution with a carrier density two orders of magnitude less than that formed on pure aluminum electrode. The XPS analysis indicated that the passive film was mainly composed of AlO(OH) after immersion for long time and the content of Mn was negligible in the outer part of the passive film. Based on the EIS measurement, electronic structure and composition analysis of the passive film, a double-layer structure, with a compact inner oxide and a porous outer layer, of the film was proposed for understanding the corrosion process of passive film, with which the experimental observations might be satisfactorily interpreted.     

（Fe—Ni）—MoS2自润滑复合镀层的制备及性能研究

在酸性氯化物电解液中进行了ＭｏＳ２微粒与铁、镍共沉积的试验，确定了制备（Ｆｅ－Ｎｉ）－ＭｏＳ２复合镀层的最佳工艺参数。对所得到的复合镀层的摩擦磨损特性进行了研究。结果表明：铁镍合金镀层中弥散分布着６．４１ｗｔ％的ＭｏＳ２微粒后，与Ｆｅ－Ｎｉ合金镀层，４５＾＃淬火钢和球墨铸铁相比，其摩擦系数和损率显著降低，镀层的摩擦磨损性能得到改善。     

Preparation of microstructure compatible porous supports by sol–gel synthesis for catalyst coatings

To enhance the inner surface of microchannel reactors, porous metal oxide coatings based on alumina, silica, and titanium oxide have been developed as support for catalytically active components. The oxides were made by the sol–gel process. Thin film coating was accomplished by dip coating using an Fe-based alloy as support. The influence of the sol composition, sol viscosity, and thermal treatment procedure on the surface enhancement factor and the porosity of the coating was investigated. The resulting surface enhancement factor reached 800 m²/m².     

连续热镀锌表面的钛盐钝化膜研究

研究了一种适用于连续热镀锌钢板表面处理的钛盐钝化膜.通过正交试验和单因素试验,确定了钛盐钝化工艺的最佳条件为:Ti(SO4)2 8 g/L、H2O2 80 mL/L、HNO3 6 mL/L、H3PO46 mL/L,钝化温度30℃,钝化时间1Os.扫描电镜和能谱分析发现,由最佳工艺得到的钝化膜均匀致密,由O、P、Ti和Z...     

Glass-Ceramic Protective Coating for Titanium Alloys

A glass-ceramic coating that protects a titanium alloy against oxidation during heat treatment has been successfully developed. In the present study, the conditions for preparing this glass-ceramic coating were investigated. In addition, the prepared coating was characterized by X-ray diffractometry, energy-dispersive spectroscopy analysis, and oxygen weight-gain testing. The results showed that the glass-ceramic coating has excellent oxygen-proof properties to protect the titanium alloy from oxidation by the atmosphere at high temperature (900°C).     

高耐蚀性锡锌合金镀层钝化工艺研究

本文重点研究了锡锌合金镀层(含锌25％左右)的铬酸盐钝化液中活化剂和硬化剂的作用,以及钝化工艺条件的影响。研制了比较理想的钝化液的组成和工艺条件,得到了彩虹色钝化膜,并具有良好的耐蚀性。     

Fabrication of hydrophobic surface with hierarchical structure on Mg alloy and its corrosion resistance

A hydrotalcite/hydromagnesite conversion coating with hierarchical structure has been fabricated on a Mg alloy substrate by in situ hydrothermal crystallization method. A MgO layer existing between the hydrotalcite/hydromagnesite film and the substrate was formed prior to the hydrotalcite/hydromagnesite film during the crystallization process. After surface treatment with silane coupling agent, the surface of conversion coating changes from hydrophilic to hydrophobic. Scanning electron microscopy (SEM) revealed that the silylated conversion coating with hierarchical structure maintains the original rough surface of which was composed of numerous micro-scale flakes and beautiful flower-like protrusions. Polarization measurements have shown that the hydrophobic conversion coating exhibited a low corrosion current density value of 0.432 μA/cm², which means that the hydrophobic conversion coating can effectively protect Mg alloy from corrosion. Electrochemical impedance spectroscopy (EIS) showed that the impedance of the hydrophobic conversion coating was 9000 Ω. It means that the coating served as a passive layer with high charge transfer resistance.     

钝化工艺对无氰镉-钛合金镀层性能的影响

为了获得无氰镀镉-钛合金的最佳后处理工艺,利用金相显微镜、电化学工作站和盐雾试验测试了三种钝化膜的外观及耐蚀性,并进行了比较。实验结果显示,三种钝化工艺获取的钝化膜经96 h中性盐雾试验后,均未出现白锈;电化学测试结果显示低铬钝化工艺获取的钝化膜自腐蚀电流密度最大,重铬酸钠钝化工艺获取的钝化膜自腐蚀电流密度最小。从环保和耐蚀性方面考虑,建议选用重铬酸钠+硝酸钝化工艺作为无氰镉-钛合金镀层的后处理工艺。     

SIMOXIDE镁合金无铬化学转化工艺

介绍了SIMOXIDE镁合金无铬化学转化膜的形貌、化学组成及相结构,描述了其成膜过程及电化学特性,给出了生产工艺。SIMOXIDE无铬化学转化膜具有表面电阻低、漆膜附着力高、耐蚀性强的特点,其主要性能达到甚至超过传统铬酸盐转化膜的水平。