镍－钨－磷非晶态合金的电沉积方法及耐蚀性能的研究

研究了Ｎｉ－Ｗ－Ｐ非晶态合金的电沉积方法，讨论了电解液组成、温度及ｐＨ值对镀层结构的影响。由Ｘ射线衍射实验测定了镀层结构和晶粒尺寸，分析了非晶态镀层的形成规律。用极化曲线分析并比较了电沉积Ｎｉ－Ｐ、Ｎｉ－Ｗ及Ｎｉ－Ｗ－Ｐ非晶态合金镀层的腐蚀行为。     

电镀

９９０９００１　Ｃｒ镀层、Ｎｉ－Ｐ、Ｎｉ－Ｍｏ、Ｎｉ－Ｗ－Ｐ和Ｍｎ－Ｚｎ合金镀层性能比较——ＡｇｌａｄｚｅＴ．ＴｒａｎｓＩｎｓｔＭｅｔａｌＦｉｎ,１９９７,７５（１）∶３０（英文）研究了Ｃｒ镀层、Ｎｉ－Ｐ、Ｎｉ－Ｍｏ、Ｎｉ－Ｗ－Ｐ和Ｍｎ－Ｚｎ合金镀层性能与电流效率／电流密度比值、热处理前后（对Ｎｉ－Ｐ合金镀层而言）镀层应力和显微硬度的关系。研究了热处理和放电处理对高硬度Ｎｉ－Ｗ－Ｐ合金镀层的影响,用比色分析法分析了各种镀层。详细介绍了电沉积Ｍｎ－Ｚｎ合金［含２５％（ｗｔ）Ｚｎ］的槽液成分、极化曲…     

W,P对Ni基非晶镀层耐蚀性能的影响

电沉积Ｎｉ－Ｐ，Ｎｉ－Ｗ和Ｎｉ－Ｗ－Ｐ非晶态合金镀层的阳极化曲线表明，添加类金属Ｐ使镀层的腐蚀电位向正移动，添加高熔点金属Ｗ使维钝电镀密度降低，此外，对Ｎｉ－Ｗ和Ｎｉ－Ｗ－Ｐ合金镀层进行印化处理，可显著提高镀层在ＮａＣｌ溶液中的耐腐蚀性能。     

非晶态Ni－W合金镀层的高温氧化性能研究EI

研究了Ｎｉ－Ｗ合金镀层的抗高温氧化及镀层加热处理后的硬度。为了进一步提高非晶态合金（Ｎｉ－Ｗ）镀层的性能，往镀液中又加入了Ｐ、Ｍｏ、Ｃｅ、Ｂ元素。     

镍—钨—磷合金镀层在硫酸介质中的耐蚀性

研究了自催化镀Ｎｉ－Ｗ－Ｐ合金镀层在Ｈ２ＳＯ４介质中的耐蚀性，结果表明，在１０％－２０％（ｗｔ）Ｈ２ＳＯ４介质中，Ｎｉ－Ｗ－Ｐ合金镀层有极好的耐蚀性，这是由于一定组成的Ｎｉ－Ｗ－Ｐ合金镀层具有非晶态结构及表面极易形成致密的钝化膜所致。     

镍—钨—磷非晶态合金的电沉积方法及耐蚀性能的研究

研究了Ｎｉ－Ｗ－Ｐ非晶态合金的电沉积方法，讨论了电解液组成、温度及ｐＨ值对镀层结构的影响。由Ｘ射线衍射实验测定了镀层结构和晶粒尺寸，分析了非晶态层的形成规律。及极化曲线分析并比较了电沉积Ｎｉ－Ｐ，Ｎｉ－Ｗ及Ｎｉ－Ｗ－Ｐ非晶态合金镀的腐蚀行为。     

（Ni—W）—WC复合镀层的研究

研究了Ｎｉ－Ｗ合金镀液中添加ＷＣ微粒制备（Ｎｉ－Ｗ）－ＷＣ复合镀层的电沉积过程，表征镀层的结构２和形貌，测试镀层在碱性溶液中的电催化氢析氧性能，探讨镀层的耐蚀性结果表明：（Ｎｉ－Ｗ）－ＷＣ为晶态复合镀层，析氢析氧性能优越，耐蚀性优良。     

合金镀层对钢冷－热疲劳性能的影响

定性和定量地研究了５种合金镀层对Ａ３钢冷－热疲劳性能的影响。结果表明，其中Ｃｏ－Ｗ镀层的冷－热疲劳抗力最高，Ｎｉ－Ｐ、Ｎｉ－Ｗ镀层的冷－热疲劳抗力最低，而Ｎ_ｉ－Ｃｏ－Ｐ、Ｃｏ－Ｗ－Ｐ居中。     

电沉积Ni-W-P合金层的组织结构与性能

采用Ｘ射线衍射、扫描电镜、金相显微镜、显微硬度计研究了电沉积Ｎｉ－Ｗ－Ｐ合金的组织结构与性能。结果表明，用本工艺可以得到三元合金Ｎｉ－Ｗ－Ｐ的非晶态镀层，镀层的高温耐蚀性优良；经过不同温度热处理后，镀层结构以非晶态→混晶态→－结晶态的顺序变化；随着结构的变化，镀层的硬度和耐蚀性也发生了相应的变化。     

Ni-W合金镀膜析出硬化的研究

由于Ｎｉ－Ｗ合金镀层硬度高、耐磨、耐蚀等特点,在工程上的应用受到了人们的注目。Ｎｉ－Ｗ合金镀层热析出硬化的原因,目前理论上还不十分清楚。作者从Ｘ衍射结构分析入手,对析出硬化原因做了理论上的探讨     

电刷镀镍钨合金层的抗高温软化性能

传统的快速刷镀镍层已不能满足工件高温服役的需要,为此,在镀镍液中加入钨酸钠制备了具有较强抗高温软化能力的镍钨合金镀层,对快速镍镀层和镍钨合金镀层进行加热保温,对比研究了温度对2种镀层表面形貌、硬度的影响。结果表明:在室温下两者都具有较高的硬度,达550HV左右;当加热到100℃时硬度达到最高值,约为600HV;600℃时,快速镍镀层的硬度只有180HV,而镍钨镀层的硬度仍可达到380HV左右。快速镍液中加入钨酸钠等制备的镍钨合金镀层具有较强的抗高温软化能力。     

The heat treatment effect on the structure and mechanical properties of electrodeposited nano grain size Ni-W alloy coatings

The Ni-W alloy coatings with tungsten content from 32.5 to 61.2 wt.% were prepared in this study by electro-deposition. Experimental results show that the grain size of Ni-W coatings evaluated by XRD decreased with increasing tungsten content in coatings, however, the micro-hardness increased with increasing tungsten content. As-deposited Ni-61.2 wt.%W coating has amorphous-like structure and the grain size is around 1.5 nm, after annealing at 500 °C, the hardness of the coating is promoted to 1293 Hv owing to formation of Ni₄W and NW precipitates. In addition, the heat-treated Ni-W coatings show a better wear resistance than the as-plated Ni-W coatings.     

热处理对电沉积Ni-W合金镀层组织结构、硬度及耐蚀性的影响

为了提高直流电沉积Ni-W合金镀层的显微硬度,改善其耐腐蚀性能,对镀层进行了热处理,研究了热处理温度和时间对镀层组织结构、硬度及耐蚀性的影响.结果表明:在一定的温度和时间范围内对镀层热处理可较大提高其硬度和耐蚀性;500℃保温1 h热处理后镀层的综合性能最好,显微硬度最高,可达1 010.44HV,且在3.5%NaCl...     

Influence of crystallite size on the hardness and fatigue life of steel samples coated with electrodeposited nanocrystalline Ni-W alloys

The present work deals with the effect of crystallite size on the hardness and fatigue life of steel samples coated with electrodeposited nanocrystalline Ni-W alloys. The Ni-W alloys were electrodeposited on steel samples at four different current densities (0.05, 0.10. 0.15 and 0.20 A/cm²) and at a temperature of 75 °C. The crystallite size of the deposit reduced (from 40 to 13 nm) with an increase in current density (from 0.05 to 0.20 A/cm²) due to an increase in the tungsten content (from 0.72 to 9.33 at.%). Ni-W alloy containing 9.33 at.% W and having a crystallite size of 13 nm exhibited the maximum hardness of 638 HV. The alloys, with the crystallite size in the range 40-13 nm, followed the direct Hall-Petch relation, i.e. hardness increased with a reduction in the crystallite size. The coated samples exhibited inferior fatigue lives compared to uncoated samples. This may be attributed to the presence of tensile residual stresses and inherent microcracks in the coatings. Among the specimens coated with Ni-W alloys, as the crystallite size decreased, the fatigue life of the specimen increased owing to the increase in hardness values.     

Electrodeposition of Ni-W Amorphous Alloy andNi-W-SiC Composite Deposits

Ni-W alloy shows not only higher hardness,betterwear and corrosion resistan.e[1-3], but also enhancedhigh temperature oxidation resistance, easier moldreleasel4]. Therefore, it is used widely in casting andforging molds, axle bearing and bar injecting plasticsin industries, and it is also a substitute for Ti partsimplallted in the bodiesIS].Easy atom diffusion in crystal and some characteristics of Ni-W alloys will be changed when amorphousNi-W alloys are heated. The hardness of all kinds o…     

氢气气氛中热处理对Ni-W合金镀层组织和性能的影响

研究了在氢气气氛中,不同的热处理温度对Ni-W合金镀层表面状态、相结构及显微硬度和耐蚀性的影响。结果表明,镀态的Ni-W合金镀层存在一种未知相(2θ≈41.4°),热处理过程中这一未知相消失,同时镀层中析出NiW、Ni_4W等沉淀相。随着热处理温度的升高,镀层的晶粒度逐渐增大,镀层在热处理过程中形成的孔隙逐渐增多。当热处理温度达到1 000℃后,镀层表面出现明显的裂纹,同时镀层中可还原形成单质W。Ni-W合金镀层的显微硬度经热处理后显著增大,热处理温度为500℃时镀层的显微硬度最大,同时镀层具有与镀态Ni-W合金相近的耐蚀性,热处理温度进一步升高后镀层的耐蚀性降低。     

Electrodeposition and mechanical and corrosion resistance properties of Ni-W/SiC nanocomposite coatings

Ni-W/SiC nanocomposite coatings with various contents of SiC nano-particulates were prepared by electrodeposition in Ni-W plating bath containing SiC particulates. The influences of the SiC nano-particulates concentration, current density and stirring rate of the plating bath on the composition of the nanocomposite coatings were investigated. The surface morphologies of the Ni-W alloy and Ni-W/SiC nanocomposite coating were observed using a scanning electron microscope (SEM). The morphology of Ni-W/SiC nanocomposite coating is smoother than that of Ni-W alloy coating. The microhardness of composite coatings increases with the increasing content of the SiC nano-particulates in the coatings. The corrosion behavior of Ni-W alloy and Ni-W/SiC nanocomposite coatings was evaluated by the anodic polarization curves in 0.5 mol/L NaCl solution at room temperature. It shows that Ni-W/SiC nanocomposite coating has better corrosion resistance than the Ni-W alloy coating.     

Substrates with a cubic texture based on paramagnetic Ni-W alloy ribbons with thin TiN coating for second-generation high-temperature superconductors

New ways to obtain textured substrates based on paramagnetic Ni-W alloys have been found for the creation of coated second-generation high-temperature superconductors (2G HTSs). The influence of the production conditions on texture formation in the Ni-W/TiN system has been studied for Ni-9.5 at % W alloy ribbons with TiN-based coating. It is established that optimization of the conditions of thin TiN-layer deposition makes it possible to obtain quasi-single-crystalline TiN coatings with a cubic texture. These textured Ni-W/TiN substrates admit the epitaxial growth of high-quality HTS films, which ensures high current-carrying capacity of 2G-HTS wires.     

物理气相沉积在耐腐蚀涂层中的应用

PVD(物理气相沉积)作为一种新型绿色的镀膜技术,由于涂层具备硬度高、耐磨性好、摩擦系数低、化学性能稳定、耐热耐氧化的特点,使其在机械、电子和光学行业得到广泛应用。近些年来随着PVD技术应用领域的不断扩展,对涂层的性能提出了更高要求,在保障力学性能的同时,如何提高涂层耐蚀性成为研究热点。概述了PVD技术应用于材料防腐的相关研究,综述了PVD涂层的成分、结构与耐蚀行为的关系,同时分别阐述了在PVD技术中提高涂层耐蚀性能的方法与机理。     

锅炉"四管"粉芯喷涂丝抗高温氧化和热腐蚀性能的研究

针对锅炉"四管"防护问题,采用氧化增重、涂盐腐蚀增重和测量涂层表面硬度的方法,研究了3种新型粉芯喷涂丝的抗高温氧化性能、抗热腐蚀性能和涂层的硬度.结果表明,新型的粉芯喷涂丝具有良好的抗高温氧化和抗热腐蚀性能;涂层的抗高温氧化和抗热腐蚀性能随铬含量的增加而提高;其中GL1号喷涂丝在具有较好的抗高温氧化和抗腐蚀性能的同时,还具有相当高的硬度.