摩擦电喷镀Ni—Co—MoS2复合镀层结构与摩擦学性能

采用摩擦电叶镀技术制备Ni-Co-MoS2复合镀层，系统试验研究了复合镀层结构与摩擦学性能。结果表明。含MoS2微粒的复合镀层与基体结合良好，基质金属密实，无明显裂纹，MoS2微粒均匀地分散在镀层中，MoS2微粒的加入，可有效改善镀层的耐磨性。     

Fe-Ni-MoS_2复合镀层摩擦磨损性能的研究

本文对优化规范下镀取的Fe－Ni－MOS2复合镀层进行了组织分析和摩擦磨损性能的研究。结果表明：Fe－Ni合金镀层中弥散分布着6．41％重量的MoS2微粒后，其摩擦系数和磨损率明显下降，镀层的摩擦学性能得到改善。     

TC4钛合金表面化学镀Ni-P-MoS_2复合镀层

研究了搅拌方式、表面活性剂种类及用量对Ni-P-MoS2复合镀层沉积速率、MoS2微粒复合量及分布的影响,借助三维视频显微镜、扫描电镜、能谱仪观察了复合镀层的形貌及镀层中各元素的含量与分布,研究了MoS2微粒在镀液中的活化与其沉积方式。结果表明,间歇搅拌保证镀液中的离子和微粒均匀分散的同时也减少了MoS2微粒的脱落,故能加快沉积速率,促进MoS2微粒含量的增加和均匀分布。在特性吸附和"空间位阻"效应的共同作用下,单一阳离子型表面活性剂的使用保证了镀层沉积速率和MoS2微粒复合量;由于阴阳离子表面活性的强烈相互作用,使得复配表面活性剂有利于MoS2微粒在复合镀层中的均匀分布。镀液中被活化的MoS2微粒通过搅拌和电场作用到达Ni-P层表面,而未被活化的MoS2微粒则仅依靠搅拌作用靠近Ni-P层表面,经催化作用,完全活化和部分活化MoS2微粒被Ni-P层完全或部分包裹,未被活化的MoS2微粒则吸附在Ni-P表面且易脱落。     

Zn-MoS2自润滑复合镀层的研究

在钾盐镀锌溶液中,采用复合电沉积的方法能获得Zn0-MoS2自润滑复合镀层,MoS2的体积分数在10%～30%之间.研究了电流密度、溶液pH值及镀液中MoS2微粒的浓度对复合镀层中MoS2含量的影响,同时测试了复合镀层的一些性能.     

新型Ni-Cu-P/MoS_2固体润滑镀层优化试验研究

本文研制出一种新型Ni─Cu─P／MoS2电刷镀固体润滑复合镀层。对影响镀层耐磨性的因素进行了正交设计：包括镀液中铜盐、次亚磷酸盐、二硫化钼及刷镀电压。对得到的九种镀层，进行了摩擦磨损实验，测量其磨损量及摩擦系数，最终优化出最佳的Ni─Cu─P／MoS2镀层及相应的镀液。本文还对镀层的相结构、成份及显微硬度进行了测试。讨论了它们对镀层耐磨性的影响。结果表明镀层中一定量的铜及亚稳间隙相对改善镀层的耐磨性及减摩性具有重要作用。     

Fe-Ni-MoS2复合镀层摩擦磨损性能的研究

本文对优化规范下镀取的Fe—Ni—MoS2复合镀层进行了组织分析和摩擦磨损性能的研究。绪果表明：Fe—Ni合金镀层中弥散分布着6．41％重量的MoS2微粒后．其摩擦系数和磨损率明显下降，镀层的摩擦学性能得到改善。     

摩擦喷射复合电沉积MoS2/Ni镀层结构与性能研究

利用摩擦喷射复合电沉积工艺在钢基材料上制备MoS2/Ni减摩复合镀层,观测分析了镀层形貌结构,并对其性能进行测试.研究表明,MoS2加入到镍镀层后,能显著改善镀层摩擦学性能,相同测试条件下,摩擦因数为同工艺纯镍镀层的1/4,磨损失重也仅为纯镍镀层的13 %.复合镀层磨损形式为磨粒磨损,除了有个别较浅、较窄磨痕之外,磨损表面较为光滑,没有出现粘着现象.     

新型Ni-Cu-P／MoS2固体润滑镀层优化试验研究

本文研制出一种新型Ni-Cu-P／MoS2电刷镀固体润滑复合镀层．对影响镀层耐磨性的因素进行了正交设计：包括镀液中铜盐、次亚磷酸盐、二硫化铝及刷镀电压。对得到的九种镀层，进行了摩擦磨损实验．测量其磨损量及摩擦系数，最终优化出最佳的Ni-Cu-P／MoS2镀层及相应的镀液．车文还对镀层的相结构、成份及显微硬度进行了测试．讨论了它们对镀层耐密性的影响．结果表明镀层中一定量的铜及亚稳间隙相对改善镀层的耐磨性及减摩性具有重要作用．     

Ni-P-Nano-Al2O3化学复合镀层的磨损机理

通过摩擦磨损试验和扫描电镜分析等手段对Ni-P-Nano-Al2O3化学复合镀层的摩擦磨损性能进行了研究,分析了Ni-P-Nano-Al2O3复合镀层的磨损机理.结果表明,在干摩擦条件下,Ni-P-Nano-Al2O3复合镀层中的Nano-Al2O3微粒能够有效地降低摩擦副之间的犁沟效应和粘着效应,从而提高复合镀层的磨损性能.     

铸铝表面制备环保型Ni-P-金刚石化学复合镀层

为提高铸铝表面耐磨耐蚀性能,采用化学复合镀技术在其表面制备环保型Ni-P-金刚石复合镀层,研究了温度及搅拌等关键因素对复合量及显微硬度的影响,对镀层耐磨性及耐蚀性进行了研究,并通过EDX能谱仪分析了镀层组成.结果表明:Ni-P-金刚石化学复合镀层可有效提高铸铝表面耐蚀性及耐磨性,且复合镀层耐磨性显著优于Ni-P镀层,但前者耐蚀性不及后者;温度和搅拌均通过影响金刚石微粒在镀件表面的滞留而对微粒进入镀层产生作用.     

电流密度和施镀温度对铝合金表面Ni-SiC-MoS2复合镀层显微组织的影响

目的研究电镀工艺参数中的电流密度和施镀温度对铝合金表面Ni-Si C-MoS_2复合镀层组织形貌及成分的影响。方法利用复合电镀的方法在铝合金上制备Ni-Si C-MoS_2复合镀层。通过扫描电子显微镜、能谱仪以及显微硬度仪,分析不同电流密度和施镀温度下复合镀层的组织结构、成分、界面之间的结合情况以及显微硬度。结果电流密度为4 A/dm2时,镀层与基体的结合差,镀层表面粗糙不平;当电流密度增加到5 A/dm2时,镀层与基体结合紧密,并且镀层表面平整;当电流密度增大到6 A/dm2时,镀层表面平整度变差。施镀温度为40℃时,镀层厚度较薄;施镀温度为50℃时,镀层与基体结合良好,镀层表面平整;当施镀温度上升到60℃时,镀层与基体结合处出现裂纹,镀层质量下降。随电流密度和施镀温度的升高,镀层中Si C和MoS_2摩尔分数先增加后减小,显微硬度先增大后减小。结论采用复合电镀的方法在铝合金表面可以制备出Ni-Si C-MoS_2复合镀层,当电流密度为5 A/dm2、施镀温度为50℃时,制备出的Ni-Si C-MoS_2复合镀层表面平整,厚度均匀,Si C与MoS_2摩尔分数可分别达到10.40%和0.77%。复合镀层的显微硬度与其Si C含量成正比,最高可达357.7HV0.01,是基体合金硬度的3.7倍。     

ZrO2 加入量对Zr-8Al合金化学复合镀性能的影响

对Zr-8Al合金进行了化学复合镀Ni-P-ZrO_2处理,并研究了不同ZrO_2粒子加入量制备的复合镀层的显微结构、显微硬度、耐磨性和抗蚀性。结果表明,与单纯化学镀Ni-P镀层相比,Ni-P-ZrO_2复合镀层的显微硬度值显著提高,ZrO_2的添加量为4 g/L获得复合镀层显微硬度最高,耐磨性好;在3.5%(质量分数)NaCl溶液中耐蚀性虽有所下降,但腐蚀后镀层完整,仍具有较好的抗蚀性。Zr-8Al合金表面采用4 g/L ZrO_2粒子制备的Ni-P-ZrO_2复合镀层兼具很好的耐磨性和较好的耐蚀性,适用于既要耐磨又要抗蚀的空间活动构件。     

电刷镀多层复合镀层的应用研究

用电刷镀研制具有层状结构的Ni-Cr2O3复合电刷镀层，采用碱铜层作为中间过渡层；研究了多层复合镀层的组织，显微硬度以及耐磨性等性能，对电刷镀多层复合镀层工艺进行了实际应用研究，结果表明，多层Ni-Cr2O3复合电刷镀层与Ni镀层相比具有较高的显微硬度，细小的结晶晶粒和较耐磨性，层状的复合镀层结构会导致磨损机理的变化，该工艺可用于大型机械设备现场不解体修复。     

Electroless plating Ni-P matrix composite coating reinforced by carbon nanotubes

Ni-P matrix composite coating reinforced by carbon nanotubes (CNTs) was deposited by electroless plating. The most important factors that influence the content of carbon nanotubes in deposits, such as agitation, surfactant and carbon nanotubes concentration in the plating bath were investigated. The surface morphology, structure and properties of the Ni-P-CNTs coating were examined. It is found that the maximum content of carbon nanotubes in the deposits is independent of carbon nanotubes concentration in the plating bath when it is up to 5 mg/L. The test results show that the carbon nanotubes co-deposited do not change the structure of the Ni-P matrix of the composite coating, but greatly increase the hardness and wear resistance and decrease the friction coefficient of the Ni-PCNTs composite coating with increasing content of carbon nanotubes in deposits.     

Study on composite surface treatment of 38CrMoAl steel

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镍-磷-钛酸钾晶须化学复合镀层的制备及性能

采用化学复合镀方法制备镍-磷-钛酸钾晶须复合镀层,用扫描电镜和金相显微镜观察复合镀层的表面形貌和断面结构,用XRD研究时效温度对镀层组织结构的影响,并解释时效温度对镀层显微硬度的影响机制。采用交流阻抗技术和中性盐雾实验研究镀层的耐腐蚀性能。在销-盘式摩擦磨损试验机上进行复合镀层的摩擦磨损性能测试。结果表明：镀层的显微硬度随温度的变化曲线呈单峰形态,在400℃时达到最大值;复合镀层具有良好的耐腐蚀性能和摩擦磨损性能,在同等实验条件下,复合镀层的磨损率只有Ni-P镀层的1/4。     

Process of electroless plating Cu-Sn-Zn ternary alloy

1 Introduction Electroless plating tin and tin alloy is an attractive technique to produce function plating layer with prior performances of corrosion resistance and decoration[1, 2], due to the possibility of uniform deposition on complex shapes, conduct…     

Copper-Ti3SiC2 composite powder prepared by electroless plating under ultrasonic environment

In this article, a new type of Cu-Ti3SiC2 composite powder prepared using the electroless plating technique was introduced. The initial Ti3SiC2 particles are 11 μm in diameter on an average. The Cu plating was carried out at middle temperature （62-65℃） with the application of ultrasonic agitation. The copper deposition rate was determined by measuring the weight gain of the powder after plating. It has been found that the pretreatment of Ti3SiC2 powder is very important to obtain copper nanoparticles on the surface of Ti3SiC2 The optimum procedure before plating aimed to add activated sites and the adjustment of the traditional composition of the electroless copper plating bath could decelerate the copper deposition rate to 0.8 gm/h. X-ray diffraction （XRD） indicates that the chemical composition of the plating layer is copper. SEM images show that the surface of the Ti3SiC2 particles is successfully coated with continuous copper layer. The wetting property between the copper matrix and Ti3SiC2 can be improved so as to increase the interfacial strength.     

Microstructure and electrical conductivity of electroless copper plating layer on magnesium alloy micro-arc oxidation coating

In order to impart electrical conductivity to the magnesium alloy micro-arc oxidation (MAO) coating, the electroless copper plating was performed. Effects of plating temperature and complexing agent concentration on the properties of the electroless copper plating layers were studied by measuring their microstructure, corrosion resistance and electrical conductivity. It was found that the optimized plating temperature was 60 °C, and the most suitable value of the complexing agent concentration was 30 g/L. Under this condition, a complete and dense plating layer could be obtained. The formation mechanism of the plating layer on magnesium alloy MAO coating was analyzed. A three-stage model of the plating process was proposed. The square resistance of the plated specimen was finally reduced to 0.03 Ω/□ after the third stage. Through electroless copper plating, the MAO coated sample obtained excellent electrical conductivity without significantly reducing its corrosion resistance.