表面活性剂对高速Zn—SiO2复合镀层的影响

采用实验室高速复合镀装置，研究向Ｚｎ－ＳｉＯ２复合镀液中分别引入表面活性剂ＤＴＡＢ和ＰＯＥＬＡ，对Ｚｎ－ＳｉＯ２镀层中ＳｉＯ２复合量和镀层表面形貌的影响，确定了理想的表面活性剂加入范围，由此获得了表面凹凸状和复事量得到显著改善的复合镀层。     

Zn—SiO2复合镀工艺研究

采用循环电镀实验装置，研究了硫酸盐体系电沉积Ｚｎ－ＳｉＯ２复合镀层的工艺。探讨了镀液中的ＳｉＯ２加入量、阴极电流密度、ｐＨ值等对镀层中ＳｉＯ２含量、阴极电流效率、镀层微观形貌的影响，确定了Ｚｎ－ＳｉＯ２得合镀最佳工艺参数。     

表面活性剂在复合电镀中作用研究

介绍了几种阳离子型、阴离子型、两性表面活性剂于Ｓｎ－Ｎｉ－ＺｒＯ２、Ｎｉ－Ａｌ２Ｏ３、Ｎｉ－Ｙ２Ｏ３、Ｚｎ－Ａｌ等复合电镀系中，对复合量α的影响。     

TiO_2对PbO－ZnO－B_2O_3－SiO_2系统玻璃析晶性能的影响

ＴｉＯ_２对ＰｂＯ－ＺｎＯ－Ｂ_２Ｏ_３－ＳｉＯ_２系统玻璃析晶性能的影响王志强，陈一鹏（大连轻工业学院１１６０３４）（齐齐哈尔轻工业学院）ＩｎｆｌｕｅｎｃｅｏｆＴｉＯ_２ｏｎｔｈｅＣｒｙｓｔａｌｌｉｚａｔｉｏｎｏｆＰｂＯ－ＺｎＯ－Ｂ２Ｏ３－ＳｉＯ２Ｓｙ...     

耐磨Ni－SiC复合电镀及其应用

含ＳｉＣ最高达１１％的Ｎｉ－ＳｉＣ复合镀层的镀液配方及操作条件为：Ｎｉ（ＳＯ_３．ＮＨ_２）_２·４Ｈ_２Ｏ４１０，ＮｉＣｌ_２·６Ｈ_２Ｏ１０，Ｈ_３ＢＯ_３５０，ＯＰ－１００．４及ＳｉＣ（３μｍ）２０－１２０ｇ／Ｌ，ｐＨ４，５５±２℃，５Ａ／ｄｍ￣２，需搅拌．     

涂敷型铬酸盐钝化膜的结构与耐蚀性

采用ＳＲＤ，ＥＤＸＡ，ＧＤＳ等方法研究了镀锌钢板表面涂敷型ＣｒＯ３－Ｈ３ＰＯ４－ＳｉＯ２系钝化膜的成分与结构。该钝化膜是一种由ＣｒＯ３，Ｃｒ（ＯＨ）３，ＣｒＯＯＨ，ＺｎＣｒＯ４，ＺｎＳｉＯ３，Ｚｎ３（ＰＯ４）２，ＣｒＰＯ４和ＳｉＯ２组成的凝胶网络状结构的涂敷型复合转化膜。探讨了其耐蚀机理，中性盐雾试验表明：该钝化膜的耐蚀性大大优于ＣｒＯ３－ＳｉＯ２系钝化膜。     

Ru(bpy)2(NCS)2染料敏化PbS/Zn2+--TiO2 复合半导体纳米多孔膜电极的光电化学

采用水热法合成了Ｚｎ２＋离子掺杂的ＴｉＯ２纳米粒子（掺杂量０．５％）;并用光电化学方法研究了 Ｒｕ（ｂＰｙ）２（ＮＣＳ）２（ｂｐｙ—２,２’－ｂｉｐｙｄｉｎｅ－４,４＇－ｄｉｃａｒｂｏｘｙｌｉｃ　ａｃｉｄ）分别敏化 Ｚｎ~２＋掺杂的 ＴｉＯ_２电极和 ＰｂＳ／Ｚｎ~２＋－ＴｉＯ_２复合半导体纳米多孔膜电极的光电化学行为．实验证明Ｒｕ（ｂｐｙ）２（ＮＣＳ）２敏化 ＰｂＳ／Ｚｎ２＋－ＴｉＯ_２复合半导体纳米多孔膜电极比单独敏化 Ｚｎ~２＋－ＴｉＯ_２电极的光电效果好,且敏化电极的光电流产生的起始波长都比 Ｚｎ２＋－ＴｉＯ２电极向长波方向移动;在 ３６０～６００ ｎｍ范围内, Ｒｕ（ｂｐｙ）２（ＮＣＳ）２敏化 ＰｂＳ／Ｚｎ２＋－ＴｉＯ_２复合半导体纳米多孔膜电极比单独敏化Ｚｎ~２＋掺杂ＴｉＯ~２电极的效果更好．     

Sn－Ni－ZrO_2复合电镀的研究

以Ｓｎ－Ｎｉ合金电镀为基础，复合ＺｒＯ_２微粒，从而使Ｓｎ－Ｎｉ合金镀层的耐磨、机械强度性能大幅度提高。研究了复合电镀工艺最佳条件和影响镀层因素，并在理论上进行探讨。还通过ｘ衍射手段，证明在Ｓｎ－Ｎｉ合金镀层中引入ＺｒＯ_２微粒，不会改变镀层的结构。     

Ni－W／F－Al_2O_3－SiO_2催化剂的表面吸附维

Ｎｉ－Ｗ／Ｆ－Ａｌ_２Ｏ_３－ＳｉＯ_２催化剂的表面吸附维朱建军，林西平（江苏石油化工学院，化工系，常州，２１３０１６）关键词表面吸附，分形维，Ｎｉ－Ｗ／Ｆ－Ａｌ_２Ｏ_３－ＳｉＯ_２催化剂１引言催化现象与多相催化剂的表面性质密切相关，催化剂表面形状是影响...     

(Zn-Co)-TiO2复合电镀的工艺研究

研究了微酸性氯化物体系中（Ｚｎ－Ｃｏ）－ＴｉＯ２复合电镀的工艺,探讨了镀液组成及工艺条件对复合镀层中Ｃｏ及ＴｉＯ２含量的影响,得到了（Ｚｎ－Ｃｏ）－ＴｉＯ２复合电镀的最佳工艺。并对（Ｚｎ－Ｃｏ）－ＴｉＯ２复合镀层的耐蚀性进行了考察,与Ｚｎ－Ｃｏ合金镀层和锌镀层的耐蚀性进行了对比。     

Ni-P-纳米金刚石化学复合镀研究

采用制备的粒度150 nm以内的复合镀用纳米金刚石悬浮液进行了Ni-P-纳米金刚石化学复合镀研究,研究了工艺条件包括纳米金刚石加入量、搅拌方式、离子型和非离子型表面活性剂及其组合的加入对复合镀镀速和镀层性能的影响。结果表明:纳米化学复合镀要求镀液有更好的稳定性;镀速与搅拌方式有关,并且随纳米金刚石的加入而提高;组合型表面活性剂对复合镀层性能提高明显;表面形貌分析观察到镀层中纳米金刚石分布均匀,颗粒在100~200 nm左右。     

The performance of surfactant on the surface characteristics of electroless nickel coating on magnesium alloy

Magnesium and its alloys corrode rapidly in the electrolyte bath. Surfactants while used extensively as surface active agents in the electrolyte bath, have been little studied on magnesium surfaces. The influence of surfactants cetyltrimethyl ammonium bromide (CTAB) and sodium lauryl sulfate (SLS) on the surface properties such as roughness, morphology and topography of electroless Ni–P deposits on magnesium alloy was researched. The research reveals that the surfactant solutions has significant influence on the composition of coating, surface roughness and surface morphology. In addition, it has marginal effect on the microhardness. Electroless coatings with addition of surfactants produce a smooth surface and average roughness value of 1.412 μm for CTAB and 1.789 μm for SLS, which are less than the value (2.98 μm) without surfactant addition. There was a significant improvement in the rate of deposition. However, the surfactants influence reached maximum at critical micelle concentration and above this value it gets stabilized. The initial structure appears to be dependent upon the percent occluded surfactants. The surface microstructures are discussed in line with the experimental observations.     

表面凝胶化技术构建粗糙细微结构

在醇溶性氟化聚合物（FR）溶液中,以正硅酸乙酯（TEOS）和甲基三乙氧基硅烷（MTES）为前体,并掺杂聚四氟乙烯（PTFE）,在酸性和水量不足的条件下,得到了均匀的复合溶胶。涂敷后,经表面凝胶化技术处理,使涂层表面得到微米级PTFE粒子和纳米级SiO2粒子相结合的微米纳米阶层结构。XPS证实了凝胶化只在涂层表面发生,SEM观察到涂层表面的形貌与荷叶表面极其相似,该方法可用于制备超疏水性功能涂层材料。     

Effects of Silica Nanoparticles Content on the Properties and Corrosion Behavior of Electroless Ni-Ba-B Alloy Coatings

The beneficial role of silica nanoparticles addition as reinforcing agent on the various properties of the novel developed Ni-Ba-B coating was highlighted. Barium was considered as third element to act as an inhibiting alloying element for anodic passivation purposes. The ternary Ni-Ba-B coatings in three different concentrations of silica nanoparticles (0.5, 1.0 and 2.0 g/L) were coated on St 37 steel substrate in the presence of sodium dodecyl sulfate (SDS). The effect of nanoparticles on morphology and structure was investigated by FE-SEM, XRD and AFM tests. The nodularity and surface roughness of the coating increased by the presence of SiO2 nanoparticles in the electroless bath. The nanocomposite coating has amorphous and crystalline phases and its XRD peak at 44.50 is slightly sharper than the composite coating. DSC thermogram showed two exothermic peaks demonstrating its phase transformations. The WCA value of coating was confirmed its hydrophilicity property. Results also confirmed that the existence of silica nanoparticles results in an increase in the microhardness and corrosion resistance which may be attributed to the distribution of silica nanoparticles into Ni-Ba-B matrix.     

纳米SiO2改性阴极电泳漆的制备及耐蚀性研究

以获得纳米二氧化硅改性阴极电泳漆为目的,用硅烷偶联剂在水介质中分散纳米SiO2粉体,通过分散液的吸光度来评价分散效果.然后将分散后的纳米粉体添加到阴极电泳漆中得到纳米改性电泳漆.试片经磷化-电泳涂装后得到复合涂层,并对复合涂层的耐蚀性能进行评价.金相显微观测表明,纳米改性电泳漆膜表面有较均匀的小突起,而未改性复合膜层表面比较光滑.吸水性测试表明,与未改性复合漆膜相比,改性后的复合涂层漆膜疏水性能有一定提高.耐酸、碱性试验表明,改性复合膜层的耐酸性明显优于未改性复合膜层,两种复合膜层的耐碱性都较好.     

镀液中TiO2对（Ni-W-P）-TiO2复合镀层性能的影响

为了进一步提高Ni-W-P合金镀层的硬度和耐蚀性,用脉冲电沉积法制备了(Ni-W-P)-TiO2复合镀层,并研究了镀液中TiO2加入量对镀层硬度和表面形貌的影响,且通过极化曲线和电化学阻抗谱研究了镀层在3.5%NaCl溶液中的耐蚀性能。结果表明,(Ni-W-P)-TiO2复合镀层的性能优于Ni-W-P镀层,而当镀液中TiO2质量浓度为6g/L时,复合镀层的硬度较高,表面形貌及耐蚀性能较优。自腐蚀电位较正,腐蚀电流密度较小,极化电阻较大,其交流阻抗谱对应的电阻值也较大。     

SiO2质量浓度对Au-SiO2复合镀层结构与性能的影响

采用复合电镀技术制备了A u-S iO2纳米微粒复合镀层,研究了镀液中S iO2纳米粉体的浓度对A u-S iO2纳米微粒复合镀层结构与性能的影响,并用扫描电子显微镜(SEM)及能谱仪(EDX)对复合镀层进行了表面形貌和能谱分析,使用X-射线衍射仪(XRD)测试分析了粉体对金镀层组织结构的影响。结果表明,随着镀液中S iO2浓度的增加,镀层中S iO2含量与镀层硬度随之增加,在镀液中S iO2质量浓度为15 g/L时,两者出现最大值;另外S iO2粉体的加入细化了复合镀层的结晶结构。     

PE基聚硅氧烷/改性SiO2超疏水薄膜的构筑

使用十八烷基三甲氧基硅烷(OTMS)对纳米SiO2进行表面疏水改性,将得到的改性纳米SiO2(OTMS-SiO2)添加到有机硅树脂(SI)中,然后采用两步法在聚乙烯(PE)薄膜表面固化制备了复合涂层SI/OTMS-SiO2.通过FTIR、1HNMR、29SiNMR、TGA对OTMS-SiO2及复合涂层进行了表征,采用接触角测量仪、SEM、AFM对复合涂层疏水特性和形貌进行了测试和观察,最后对复合涂层的耐磨性和附着力进行了分析.结果表明,SiO2表面成功引入了OTMS,且OTMS-SiO2均匀附着在硅树脂涂层上,增加了表面粗糙度,得到了PE基固化超疏水复合涂层.当OTMS-SiO2添加量为正己烷质量的8％时,制得的复合涂层的水接触角为154°,滚动角为7°,并具有良好的耐磨性,其附着力可达4A等级.     

Morphology of hybrid coatings based on polyester, melamine resin, and silica and the relation with hardness and scratch resistance

The morphology of hybrid coatings based on polyester, melamine resin, and various amounts of silica has been investigated, and the hardness and scratch resistance were determined. By increasing silica content, an increase of silica particles in size and number was observed. Small silica particles were preferentially present at the surface. The influence of the silica content on the K?nig hardness, indentation hardness, and elastic modulus was minor. The improved scratch resistance determined for a hybrid coating with 11.4 wt% silica, compared to a similar organic coating without silica, was attributed to small silica particles preferentially present at the surface. Presented at the 26th International Waterborne, High-Solids, and Powder Coatings Symposium, February 10–12, 1999, New Orleans, LA. Dept. of Polymer Chemistry and Coatings Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands. Materials Division, Dept. of Materials Chemistry and Coatings, P.O. Box 595, 5600 AN Eindhoven, The Netherlands.     

Mullite coatings on ceramic substrates: Stabilisation of Al2O3–SiO2 suspensions for spray drying of composite granules suitable for reactive plasma spraying

The present work deals with the preparation of stable alumina + silica suspensions with high solid loading for the production of spray-dried composite powders. These composite powders are to be used for reactive plasma spraying whereby the formation of mullite and the coating on a ceramic substrate are achieved in a single step process. Electrostatic stabilisation of alumina and silica suspensions has been studied as a function of pH. Silica suspensions are most stable at basic pH whereas alumina suspensions are stable at acidic pH. The addition of ammonium polymethacrylate (APMA) makes it possible to stabilise alumina and prepare a stable 50 wt% alumina + silica suspension at pH 10. The optimum amounts of dispersant and binder have been determined by zeta potential, viscosity and sedimentation measurements. Spray drying of the suspension yields composite powders whose morphology, size distribution and flowability have been characterized before realizing reactive plasma spraying tests.