铜电极上Zn—Ni—P合金电沉积行为的研究

采用循环伏安法研究了铜电极上Ｚｎ－Ｎｉ－Ｐ合金电沉积行为。结果表明：在Ｚｎ－Ｎｉ合金镀液中加入ＮａＨ２ＰＯ２，Ｚｎ－Ｎｉ－Ｐ电沉积的阴极极化减小，对合金电沉积起活化作用，有利于Ｚｎ－Ｎｉ－Ｐ合金镀层的形成，所获得的Ｚｎ－Ｎｉ－Ｐ合金层与Ｚｎ层，Ｚｎ－Ｎｉ合金层相比阳极溶解峰电位正移，使含磷的锌基合金的耐蚀性大大提高。     

电沉积Ni—Fe—P合金工艺研究

为改善Ｎｉ－Ｐ镀层性能，开发研究了Ｎｉ－Ｆｅ－Ｐ镀层。研究了镀液主要成分和工艺参数对镀层成分、沉积速度和显微硬度的影响。研究表明，Ｎｉ－Ｆｅ－Ｐ镀层中各元素的含量随镀液中相应盐浓度的增大而提高；低ｐＨ值和电流密度可适当提高镀层含磷量；高电流密度有利于铁的沉积；提高镀液温度和ｐＨ值加快沉积速度，却降低镀层硬度。较高的电流密度可获得较高的沉积速度和镀层硬度。     

电沉积Ni—Fe—P非晶态合金耐蚀性的研究

用电沉积法获得的Ｎｉ－Ｆｅ－Ｐ非晶态合金层的耐蚀性在某些介质中优于Ｎｉ及Ｎｉ－Ｆｅ合金；在碱性及强氧化性介质中，其耐蚀性相当或优于Ｎｉ－Ｐ合金；在含有Ｃｌ＾－的介质中，该合金未能阻止点蚀的产生。     

铜电极上Zn－Ni－P合金电沉积行为的研究

采用循环伏安法研究了铜电极上Ｚｎ－Ｎｉ－Ｐ合金电沉积行为。结果表明：在Ｚｎ－Ｎｉ合金锭液中加入ＮａＨ２ＰＯ２，Ｚｎ－Ｎｉ－Ｐ电沉积的阴极极化减小，对合金电沉积起活化作用，有利于Ｚｎ－Ｎｉ－Ｐ合金镀层的形成。所获得的Ｚｎ－Ｎｉ－Ｐ合金层与Ｚｎ层、Ｚｎ－Ｎｉ合金层相比阳极溶解峰电位正移，使含磷的锌基合金的耐蚀性大大提高。     

Ni—P—Si3N4化学复合镀层性能测试

对Ｎｉ－Ｐ－Ｓｉ３Ｎ４复合镀层的显微硬工、耐磨性及结合强度进行了测试。结果表明：化学沉积Ｎｉ－Ｐ－Ｓｉ３Ｎ４合金是一种值得推广应用的新耐磨镀层。     

水溶液中电沉积Ni—La—P合金的研究

含稀土金属的合金具有特殊的功能，常用作电催化材料。由于稀土元素的标准平衡电位较负，在水溶液中很难沉积。因此，采用柠檬酸和氯化铵为混合配位体，硼酸为稳定剂从水溶液中电沉积出Ｎｉ－Ｌａ－Ｐ合金镀层。详细介绍了镀液各个组分及工艺条件的选择，获得了灰白色、细致的合金镀层。对所得的支进行ＳＥＭ观察和ＸＰＳ分析，结果表明，所得镀层为Ｎｉ－Ｌａ－Ｐ合金。     

复合化学镀（Ni—Cu—P）—Al2O3的工艺研究

研究了复合化学镀（Ｎｉ－Ｃｕ－Ｐ）－Ａｌ２Ｏ３的工艺与组成,复合材料的沉积速率高于Ｎｉ－Ｃｕ－Ｐ合金;随着镀液中Ａｌ２Ｏ３添加量的增加,复合镀层中Ａｌ２Ｏ３体积分数提高,达到２５ｇ／Ｌ时则不再上升,氧化铝与Ｎｉ－Ｃｕ－Ｐ合金复合,致使（Ｎｉ－Ｃｕ－Ｐ）－Ａｌ２Ｏ３的组成由非晶态过渡到晶态,随着热处理温度的升高发生不同的变化。     

化学镀Ni—Sn—P合金的工艺研究（Ⅰ）

研究了以复合配位剂的化学镀Ｎｉ－Ｓｎ－Ｐ合金镀液，镀液组分和操作条件对沉积速度的影响，综合考虑镀层的组成，镀液的稳定性，确定了化学镀Ｎｉ－Ｓｎ－Ｐ合金的镀液最佳组成和工艺条件。     

Ni^2＋,Fe^2＋和H2PO2^—,H2PO3^—在悬汞电极上的电化学行为

采用循环伏安法研究了Ｎｉ＾２＋、Ｆｅ＾２＋、Ｈ２ＰＯ２＾－、Ｈ２ＰＯ３－在悬汞电极上的电化学行为以及Ｈ２ＰＯ２＾－、Ｈ２ＰＯ３＾－在ＫＣＬ支持电解质中的不原机理，对电沉积Ｎｉ－Ｆｅ－Ｐ非晶态合金中磷的沉积机理有进一步的认识。     

化学复合镀Ni—P—ZrO2镀层工艺试验及性能测试

通过化学复合镀Ｎｉ－Ｐ－ＺｒＯ２的工艺试验,选择了适宜的化学镀溶液、合适的添加剂,得到了Ｎｉ－Ｐ－ＺｒＯ２复合镀层,并对复合镀层进行了性能测试。结果表明镀层结构致密,沉积速度快,其耐磨性均较好,并在该工艺条件下得到了非晶态镀层。     

Electrochemical corrosion performance in 3.5% NaCl of the electrodeposited nanocrystalline Ni films with and without dispersions of Cr nanoparticles

Nanocrystalline (nc) Ni films with and without dispersions of Cr nanoparticles were electrodeposited from a nickel sulfate bath. The grain size of the nc-Ni films was reduced with increasing in the co-deposition content of Cr nanoparticles. Potentiodynamic polarization tests showed that increasing in the co-deposition content resulted in an enlarged passive region of the nc-Ni in 3.5% NaCl through reducing the corrosion potential and increasing the breakdown potential. Scanning electron microscopy (SEM) observation indicated that the polarized pure nc-Ni film exhibited numerous large and deep pits. However, they became smaller and shallower when 4.5 wt.% Cr nanoparticles were co-deposited, and almost disappeared when 10.9 wt.% Cr were co-deposited. X-ray photoelectron spectroscopy (XPS) analysis showed that the different electrochemical corrosion performance was associated with the ability of the Cr nanoparticles co-deposited nc-Ni film to form a continuous Cr-oxide passive film.     

Studies on the effect of cobalt addition to the nickel hydroxide electrode

Ni(OH)₂ electrodes are known to take up potassium and lithium ions from electrolytes on cycling. The present study revealed lower levels of adsorption of potassium and lithium in the case of cobalt co-deposited -nickel hydroxide electrodes although similar uptake patterns were clearly visible. At room temperatures, addition of cobalt has also been found to be advantageous in so far as the electrode performance on repeated cycling in 1 M LiOH+4 M KOH is concerned. In pure KOH, however, cobalt addition has been found to have a detrimental effect on the life of the electrode although an easier charging process is observed in the initial stages. Increase in the end-of-charge potential in lithiated electrolyte was found to be a direct consequence of lithium adsorption by the cobalt co-deposited -nickel hydroxide electrodes.     

(Ni-P)-Co/WC纳米颗粒复合电刷镀层的组织性能分析

采用电刷镀技术制备(N i-P)-Co/W C纳米颗粒复合镀层,用扫描电子显微镜、X-射线衍射仪和电子探针测定了复合刷镀层表面形貌、微观组织结构及成分分布。结果显示,复合镀层中的组织结构更加致密,显微硬度比镍-磷合金镀层有较大程度的提高。     

Thermodynamic analysis on the codeposition of ZrC–SiC by chemical vapor deposition using the ZrCl4–C3H6–MTS–H2–Ar system

A thermodynamic calculation on co-deposition of ZrC–SiC from the ZrCl₄–C₃H₆–MTS–H₂–Ar system was performed using the FactSage thermochemical software and verification experiments were performed. The surface diagrams of condensed-phases in this system were expressed as functions of the deposition temperature, total pressure, reactant ratio of MTS/(MTS+C₃H₆) and ratio of H₂/(ZrCl₄+MTS+C₃H₆), and the composition of the products was determined by the diagram. The calculation results indicate that their yields strongly depend on the molar ratio of the injected reactants and temperature, and ZrC–SiC can be co-deposited under a proper condition. The experimental results show that ZrC–SiC coating was successfully co-deposited on graphite substrates and carbon fibers according to the thermodynamic calculation.     

氮化铝添加量对Cu-AlN复合镀层腐蚀性能的影响

采用复合电沉积的方法制备出Cu-AlN复合涂层.利用SEM观察复合镀层.结果显示,复合镀层表而为胞状结构.XRD测试表明,该合金镀层为Cu和AlN.采用浸泡腐蚀失重和测定极化曲线的方法比较了不同氮化铝添加量对复合镀层耐腐蚀性能的影响,结果表明:当氮化铝添加量为10g/L时,复合镀层的耐蚀性能最好.     

电沉积钴-钨合金薄膜的磁性能及其测量方法

采用电沉积技术在纯铜片上制备了钴-钨合金薄膜,并研究了钴-钨合金薄膜的磁性能与其厚度、结构及表面形貌等的关系。结果表明:钻鹄电沉积属于诱导共沉积,铸在鉛表面氢原子的催化作用下与钴发生共沉积。钴-钨合金薄膜的厚度约为6um,属于Co3W四面体结构,其表面由典型瘤状颗粒构成。钴-钨合金薄膜垂直方向的磁性能优于平行方向的磁性能,最大矫顽力为74.42 kA/m.     

Nano zinc oxide as a UV-stabilizer for aromatic polyurethane coatings

Nano zinc oxide (ZnO) was co-deposited together with a cathodic electrodeposition paint onto phosphated normal steel panels. The films containing nano zinc oxide were compared with blank films regarding their stability against UV radiation. SEM micrographs show that nano-ZnO can stop the formation of cracks in the film. On the other hand, AFM, surface roughness and loss of gloss studies showed that the presence of nano zinc oxide particles reduces the photo-degradation of the aromatic polyurethane binder. It was also found that the presence of the nano-sized ZnO particles in the films reduces the tendency of the films to yellowing.     

Synthesis and characterization of Ni-W/TiN nanocomposite coating with enhanced wear and corrosion resistance deposited by pulse electrodeposition

To enhance mechanical properties and anti-corrosion capability of Ni-W alloy further, Ni-W/TiN nanocomposite coating has been co-deposited via pulse current co-deposition in this work. The effects of TiN nanoparticles and operating parameters on the structure and properties of the deposited coating were examined. It illustrated that the nanocomposite coatings are uniform, dense and crack-free, exhibiting dome-like or hill-valley like structure. The particles were homogeneously incorporated in the metallic matrix. RTC analysis indicated that the preferred orientation of Ni-W/TiN was (111) texture. The crystallite size was of 10–16 nm, indicating the formation of nanocrystalline structure. TiN concentration, duty cycle and frequency could influence the amount of TiN particle and W element in the coating, then regulating hardness and anti-wear behaviors. The low duty cycle and long deposition time could diminish the roughness of the coating. The inclusion of TiN nanoparticles in the nickel matrix could promote the nucleation of fresh nickel crystals and restrict the growth of already formed nickel grains, favoring the homogeneous growth and grain refinement of Ni-W crystals. The doped TiN particles would favor the preferred orientation (111) plane, enhanced the hardness, wear and corrosion resistance of Ni-W alloy. Electrochemical results illustrated that the best corrosion-resistant properties of the nanocrystalline coating could be obtained at TiN 30 g L⁻¹, duty cycle of 20% and frequency of 60–200 Hz. The enhanced mechanical properties and corrosion resistance of Ni–W/TiN coating benefits its application in harsh corrosive environment.     

Tribological studies of electroless nickel/diamond composite coatings on steels

In this study, a commercially available process of electroless nickel plating with co-deposited diamond powders was applied to a steel substrate as an intermediate layer prior to diamond deposition by MPECVD. The diamond films show excellent adherence, since they are strongly bounded to the diamond particles, deeply anchored into the electroless plated nickel matrix. A synergism effect of electroless nickel plating and MPECVD diamond growth are discussed. The electroless nickel plate which can be hardened itself by the precipitated phosphide phases after the heat treatment is an efficient diffusion barrier against the inter-diffusion of iron from the steel substrate and carbon from CH₄. A more continuous and smoother diamond film can be formed on the outermost surface. The results of tribotesting indicated that each step in the process of composite formation significantly lowers the friction coefficient (μ), especially the secondary layer of electroless nickel plate (~ 1 μm) is particularly effective and possesses a steadily low value of μ, which has promise for tribological applications. The secondary nickel layer could enhance the adherence of diamonds in the metal matrix, and be responsible for the better continuity of the top diamond film.     

碳纤维增强环氧树脂电镀Cu-SiO2纳米微粒复合镀层

研究了电镀液中SiO2纳米微粒含量对碳纤维增强环氧树脂复合材料复合电镀层的影响.结果表明,硫酸铜电镀溶液中加入一定比例SiO2纳米微粒可使复合材料镀层维氏硬度提高,镀层晶粒得到明显细化,镀层致密度提高,随SiO2纳米微粒含量提高镀层导电性略有下降.