镁合金表面化学镀镍-磷合金稳定剂的选用

研究了KI、KIO3、PbAc2、KIO3+PbAc2和KIO3+硫脲五种稳定剂对镁合金表面化学镀镍-磷合金镀液的稳定性、镀层的表面形貌及性能的影响,并优选出适合于镁合金表面化学镀镍、磷合金镀层的最佳稳定剂。结果表明:随着稳定剂的加入,镀液的稳定性得到了改善,但不同种类稳定剂对镀液的稳定效果不同;二元复合稳定剂所得镀层的表面形貌、质量优于单一稳定剂的;根据镀层的性能,确定出KIO3+硫脲稳定剂是本试验条件下的最佳稳定剂。     

非晶态化学镀镍磷合金稳定剂研究

研究了化学镀镍溶液中稳定剂对镀液稳定性、沉积速度的影响，并对镀层的磷含量及耐腐蚀性能进行了测试。在原有镀液体系基础上找到了一种较理想的复配稳定剂M9。研究表明：稳定剂M9的适量加入提高了镀液的稳定性，延长了镀液的使用寿命，而对沉积速度与镀层磷含量影响不大，所得镀层均为非晶态结构。     

高强度钢中温化学镀镍磷合金工艺技术研究

针对兵器某飞行智能产品中所用高强度钢滑动零件化学镀镍磷合金难施镀及镀层性能差的特点,从材料特性与化学动力学的相互关系出发,运用正交试验和均匀试验,获得了适合于高强度钢的中温化学镀镍磷合金工艺技术,并顺应“清洁生产”的发展趋势。通过研究镀液主盐含量及比值、络合剂、加速剂、稳定剂、温度、pH值等因素对沉积速度、镀层耐蚀性与耐磨性的影响,解决高强度钢零件化学镀镍磷合金难施镀、镀层易起皮、结合力差、镀层耐蚀性与耐磨性匹配性差等问题。靶试及库存结果表明：该工艺技术获得的镀层性能良好,耐蚀性与耐磨性实现了最佳匹配,可为兵器装备高硬材料化学镀提供技术参考,尤其在复杂多变的环境下服役的智能化产品滑动零部件上,具有广阔的应用前景。     

QT600-3铸件化学镀Ni-P合金工艺的应用

以QT60 0 3为对象 ,实验分析化学镀Ni P合金过程中 ,镀液PH值、络合剂、稳定剂的种类、含量、施镀方式及后处理等对镀层含磷量、表面型貌及耐蚀性的影响 ,活化处理时间及热处理温度对镀层结合力的影响。     

高稳定性化学镀镍磷合金工艺研究

运用扫描电子显微镜研究了含稀土元素镀液镀层初期沉积形貌及组织结构，探讨了稀土离子对化学镀镍磷的影响，并通过正交试验对镀层耐腐蚀性等性能进行了测试比较，取得了稀土复合镀镍磷合金的最佳配方。研究表明：在原有的化学镀技术中引入稀土元素，晶粒细化，镀液寿命延长，得到的整体非晶态镀层耐腐蚀性提高。     

电沉积制备纳米晶镍-钨-稀土合金镀层工艺及性能

采用电沉积技术制备了纳米晶镍-钨-稀土合金镀层,重点研究了其制备工艺及镀层性能,探讨了电流密度、电沉积时间、镀液中稀土含量、镀液pH值和镀液温度等因素对镀层沉积速率的影响;用SEM、XRD、EDS、阳极极化曲线等方法分析了镀层的表面形貌、结构、组成、耐蚀性和抗氧化性等。结果表明:合金镀层的最佳制备工艺条件为电流密度9.5 A·dm~(-2)、镀液pH值7、电沉积时间70 min、镀液温度50℃、镀液中NdCl_3添加量4.5 g·L~(-1)或镀液中Ce(SO_4)_2添加量3 g·L~(-1);添加稀土元素钕、铈后合金镀层表面颗粒排列致密、均匀,表面无裂纹,其抗高温氧化性和耐蚀性能与硬铬镀层比较相差较小。     

多壁纳米碳管化学镀钴磷合金

碳纳米管经纯化、氧化、敏化、活化预处理后，在碱性镀液中化学镀磁性金属钴磷合金，得到一维纳米复合材料。探讨了镀覆的最佳工艺参数。利用透射电镜（TEM）及扫描电镜（SEM）观察施镀前后表层形貌，用能谱分析测试镀层的组成，并用振动磁强检测仪测量了镀后碳纳米管的磁性能。研究表明，镀后碳纳米管外表面被钴磷合金紧密均匀包覆，矫顽力较之钴磷膜、钴粉有较大提高、可望在高密度磁记录材料中得到应用。     

化学镀镍磷合金工艺在齿轮油泵轴上的应用

在齿轮泵轴上,采用一种化学镀镍磷合金工艺。介绍了镍磷合金镀液配方、工艺条件及镀层性能等。     

低碳钢基体上Ni—Fe合金镀层耐蚀性的研究

介绍了在低碳钢基体上电沉积Ｎｉ－Ｆｅ合金镀层耐蚀性的研究成果。研究结果表明：低碳钢基体上Ｎｉ－Ｆｅ合金镀层的相结合是α和γ双相合金，镀层的光亮性，耐蚀性与纯镍镀层相当，镀液中适宜的ＦｅＳｏ４含量是１０ｇ／Ｌ，采用化学铜做过镀层，可进一步降低Ｎｉ－Ｆｅ合金的孔隙率，显著提高Ｎｅ－Ｆｅ合金镀层耐蚀性。     

化学镀Co－Ni－P合金工艺的研究

在正交化试验的基础上，讨论了化学镀钴镍磷三元合金镀液组成和操作条件对沉积速度的影响，获得了具有良好的钴镍磷合金镀层经济的、实用的工艺配方。     

活塞式气体压缩机阀片的化学镀Ni-P合金工艺研究

对活塞式气体压缩机的13CrMo钢阀片进行镀Ni—P工艺研究。分析了活化处理时间对化学镀Ni—P镀层结合力、热处理温度对镀层表面硬度及后处理等对锌层耐蚀性的影力规律。用优选的工艺参数对阀片进行表面强化与防蚀处理，获得了较好的效果。     

化学镀镍-磷-纳米SiC-PTFE复合镀层的组织结构与晶化动力学

采用扫描电镜、X射线衍射仪、差热分析仪等分析了化学镀镍-磷-纳米SiC-PTFE复合镀层的表面形貌和物相结构,并研究了镀层的晶化动力学。结果表明:纳米SiC、PTFE颗粒均匀地分布于复合镀层中,且SiC颗粒在镀层中发生部分团聚;随热处理温度升高,镀层由镀态下的非晶态出现晶化,并逐渐析出镍、Ni3P以及Ni3Si等晶相;与镍-磷镀层相比,这种含两种颗粒的复合镀层表现出较低的晶化起始温度与较长的晶化时间,且其晶化激活能为268kJ.mol-1。     

Synergy Between Corrosion and Wear of Electrodeposited Ni–W Coating

In this study, a block-on-ring wear tester was employed to investigate the tribocorrosion behavior of the electrodeposited Ni–W coating. Columnar grains embedded with lamellar and nanocrystalline microstructure were found in the fabricated Ni–W coating. The passivation of the Ni–W alloy was observed in the potentiodynamic polarization curve measured in 5 wt% NaCl solution. The result showed that with the raise of the applied overpotential, both the wear rate and the surface W-content of the coating increased. On the contrary, the accompanying coefficient of friction decreased with the potential. Small pitting and cracking occurred on the tested specimen. This microcracking structure was also observed in the corroded zone of the Ni–W coating by using TEM microscopy. A further XPS analysis determined the corrosion film was composed of Ni(OH)₂, NiO, and WO₃ on the corroded surface. The formation of this porous corrosion film at high overpotential was found to cause an accelerated weight loss and thereby, the interaction between wear and corrosion, of the Ni–W coating under tribocorrosion.     

镍基合金复合涂层耐蚀性的研究

研究了真空熔烧镍基合金复合涂层在40％NaOH、10％H2SO4溶液、10％HCl溶液及36％NaCl溶液中的耐蚀性。结果表明,复合涂层在4种溶液中都具有良好的耐蚀性。腐蚀出现在硬质相与镍基基体之间,属晶间腐蚀。     

A study on the wear resistance characteristics of pulse electroforming Ni–P alloy coatings as plated

In this study, attempt has been initiated to investigate the wear resistance of Ni–P alloy coatings manufactured by pulse current (PC) electroforming technology. The wear tests of such plated coatings were carried out at ambient temperature and without lubricants. The parameters of the electroforming experiments include peak current density, duty cycle and pulse frequency. The results of this investigation showed that the internal stress of the PC-deposited Ni–P coating is much lower than that of direct current (DC) deposited Ni–P coating. The analytical results indicate that increasing of the phosphorus content in the layer reduces the hardness of the Ni–P electroformed coatings, and it gradually leads to transformation of the coatings structure from micro-crystalline to nano-crystalline/X-ray amorphous. Wear trace morphology shows that the wear mechanism of Ni–P coatings herein is related to hardness. As the hardness increases, the worn morphology of the coatings changes from with scratches and abrasions to that with the steel debris adhered on the coatings. The wear resistance of Ni–P alloy electroformed layers increases with the hardness of the coatings. The hardness primarily affects the wear resistance of the Ni–P as plated coatings, and the optimum wear resistance of Ni–P coatings can reach 11 times that of Ni coatings.     

电刷镀法制备钢基体超疏水表面的实验研究

采用复合电刷镀技术,在Q235钢表面制备了具有超疏水性能的n-SiO2/Ni纳米复合镀层,在优选的工艺参数下,获得了接触角为1698°、滚动角为23°的超疏水表面。研究了刷镀电压和刷镀时间对镀层表面结构和疏水性的影响规律;分析了复合镀层表面和截面的结构形貌特点;研究了电刷移动速度对复合镀层中n-SiO2含量的影响规律。对镀层的接触角、表面粗糙度和显微硬度进行了表征。结果表明：刷镀电压和刷镀时间是影响复合镀层表面微观结构特征的重要因素;复合镀层表面的微纳米双重结构对表面的超疏水性起到了关键的作用。     

Wear and corrosion behavior of electrodeposited nickel–carbon nanotube composite coatings on Ti–6Al–4V alloy in Hanks′ solution

Carbon nanotubes (CNT) have received considerable interest in many industries, but composite coatings of CNTs have not yet been sufficiently developed for use in biomedical implants. This investigation elucidates the wear and corrosion behavior of electroplated Ni/CNT composite coatings on Ti–6Al–4V alloy in Hanks’ solution. Experimental results indicate that the CNTs in an electroplated Ni/CNT composite coating increase its hardness to 98.5% higher than that of a pure Ni coating. Additionally, an Ni/CNT composite coating can form stable and dense passive film, which significantly improves wear and corrosion in Hanks′ solution.     

Corrosive Wear and Mechanical Properties of Ni/Al2O3 Micro- and Nanoparticulates-Reinforced Coatings on Ti-6Al-4V Alloy

Nanocomposite coatings can endow a plated surface with various properties such as wear resistance, high-temperature corrosion protection, oxidation resistance, and self-lubrication. This work studies the corrosion and corrosive wear resistance of electroplated nickel nanocomposite coatings on Ti-6Al-4V alloy in a Hank's solution, adding various concentrations of an Al₂O₃ powder in plating solution, with particle diameters of 20–30 nm and 1 μm for comparisons. The experimental results showed that the content of Al₂O₃ incorporated into the electroplated nickel composite coating increased with the concentration of Al₂O₃ powder in the electroplating solution, and increasing the surface hardness, corrosion, and corrosive wear resistance of electroplated nickel micro- and nanocomposite coatings caused smearing of the nodule boundary and elimination of voids in the deposits. The Al₂O₃ nanoparticulates were embedded and distributed more uniformly than the Al₂O₃ microparticulates in the nickel matrix after a heat treatment of 400°C, producing a more continuous and dense coated composite layer on the Ti-6Al-4V substrate. This phenomenon is responsible for the Ni/Al₂O₃ composite coating with superior surface hardness, providing high corrosion resistance and corrosive wear protection to the Ti-6Al-4V alloy substrate in Hank's solution.