连续电镀锌-镍合金技术的研究

提出了连续电镀锌镍合金的高氯化氨-弱酸型镀液工艺参数,对镀液成分、pH值、温度、阴极电流密度对镀层镍含量的影响及连续电镀锌镍合金的镀速控制等问题进行了研究.得到外观良好、镍含量在13%～15%的锌镍合金镀层.     

锂离子电池高容量阴级材料Li-Ni合金

美国波士顿的Tiaxllc公司开发成功一种新型锂-镍合金,可为锂离子电池阴极提供高容量的阴极材料,较之现用的标准阴极材料的容量增高40％。由于新合金独特的结晶组织,使得它用作电池阴极时不仅容量增高,而且循环寿命延长,在更宽的电力和温度范围内提供更高的电池性能。Tiax公司经过多年来的研究开发,运用量子力学模拟技术使锂-镍合金结晶组织稳定化,结果制得了性能和安全性优越的锂-镍合金阴极材料,已开始用于锂离子电池上。     

防腐包装文摘

铁-镍合金装饰镀层的电沉积 M. Bratoewa等《Galvanotechnik》1981,72,3,263～267(德) 本文讨论了电解液的温度和pH值、阴极电流密度、铁与镍阳极面积之比、三价铁离子浓度等工艺参数对铁-镍合金装饰镀层性能的影响。本文还详细地讨论到了在无电流流过的情况下阿姆克铁阳极(纯铁)的状态。     

新型活性阴极在隔膜电解槽的应用

通过电镀法将纳米结构镍合金沉积在普通隔膜阴极上,开发新型活性阴极,降低阴极极化过电位。将该活性阴极技术与改性隔膜和扩张阳极技术集成,使普通隔膜电解槽改造成为节能型隔膜电解槽,降低隔膜电解槽的整体电压,达到节能降耗的目的。隔膜法烧碱耗电约占成本的81%,严重影响了氯碱企业的经济效益,成为困扰氯碱企业发展的重要因素之一。     

铜镍合金B-30在氯化钠介质中的电化学行为

用电化学方法研究了铜镍合金B-30在氯化钠介质中的阳极和阴极过程。B-30的阳极过程受产(?)扩散控制,表面形成膜阻滞阳极过程;阴极过程是氧的还原,在腐蚀电位φ_c附近是活化控制。按此机理推导了求腐蚀电流Ic的动力学公式,并用计算机解析,求出了部份动力学参数。     

航炮磨损滑板的修复工艺

为了解决航炮磨损失效滑板的修复问题,研究了在18Cr2Ni4WA高强度钢表面刷镀铁-钴-镍合金镀层的工艺.通过对航炮磨损失效滑板失效原因的分析,提出了修复该零件的新工艺.采用电刷镀铁-钴-镍合金镀层体系,通过降低阴极电极电位,增加阴极极化程度,使形成晶核的速度大于晶粒的成长速度,提高了镀层与基体的结合力.当镀层厚度为25μm时,镀层硬度达到700HV;附着力良好,网格剥离试验镀层无脱落;弯曲试验镀层无脱落;杯突高度为5.0mm;镀层磨损量为0.117mg/次,与基体(0.112mg/次)耐磨损性相当.试验表明,通过刷镀铁-钴-镍合金镀层体系,可以获得能满足修复磨损滑板要求的镀层.     

铜镍合金铸铁耐碱腐蚀性能研究

采用动态失重法测定铜镍合金铸铁在高温浓碱液中的腐蚀速度,借助光学显微镜和扫描电镜观察显微组织和表面腐蚀形貌,利用能谱仪分析表面微区成分。结果表明,微观基体上富集的铜和镍有利于提高铜镍合金铸铁的耐蚀性,在高温浓碱液中的动态腐蚀条件下,铜含量为4.5%的D3试样耐碱蚀性较好。当铜含量超过一定值时,铜镍合金铸铁中析出游离铜相,这些新相成为活性阴极相,降低铸铁的耐蚀性。     

十二胺对氯化钠溶液中铜镍合金的缓蚀行为及吸附机理的研究

用电化学方法和原子力显微镜(AFM)研究了NaCl溶液中十二胺在铜镍合金表面的缓蚀及吸附行为.结果表明,十二胺对阴极和阳极反应均有抑制作用,但主要抑制了阴极反应.吸附模型的拟合结果证明十二胺在铜镍合金表面的吸附符合Flory-Huggins等温线模型.十二胺吸附膜改变了电极表面双电层结构,使零电荷电位正移.AFM相位图显示,随着缓蚀剂浓度增加,缓蚀剂吸附层变得更加致密和有序,导致缓蚀效率增加.AFM力曲线测试结果指出,含有十二胺的溶液中力曲线显示粘附力特性,而且探针与样品表面之间的长程静电斥力与空白溶液相比有减小趋势.     

铜镍合金凝固过程的数值模拟

铜镍合金因结晶温度范围窄、体收缩率大,铸造过程中易在铸件内部产生气孔、缩松等缺陷.应用铸造过程有限元模拟软件ProCAST对不同浇注条件下铜镍合金凝固过程中温度场分布和缺陷形成过程进行了数值模拟,根据模拟结果和实验结果分析了不同浇注条件对铸件质量的影响,对铜镍合金的浇注模具进行了优化设计.模拟结果表明,在钢模加变径保温冒口浇注条件下,铜镍合盒铸锭的质量最佳.     

镍合金多孔材料力学性能的研究进展

介绍了镍合金多孔材料的力学性能,概述了目前镍合金多孔材料力学性能的研究进展.     

Kupfer-, Nickel- und Titanlegierungen für Seewasseranwendungen

Copper and nickel alloys and titanium for seawater applications Copper and nickel alloys and titanium have been successfully used for heat exchangers on ships. In power plants and for chemical apparatus and piping systems because of their resistance against corrosion in sea water. Aluminium brass and copper nickel alloys, the standard materials for condensers and coolers, however, may be attacked, the corrosion depending on water quality, water velocity, and structural conditions. The mechanisms of corrosion are discussed. Under severe conditions the use of titanium may be indecated. The use of nickel base alloys is advantageous at elevated temperatures, e. g. for chemical reactions and for evaporation processes. Examples are given for application and for prevention of corrosion.     

The resistance to stress corrosion cracking of some Cr–Ni–Fe austenitic steels and alloys

Abstract

Stress-corrosion cracking testing by a variety of methods has been carried out in chloride and caustic environments on a series of Cr–Ni–Fe austenitic steels and alloys containing between 10 and 25 % of chromium and 15 and 45% of nickel. Limited testing has also been carried out on alloys containing additions of molybdenum and copper. The tests have confirmed that increasing the nickel content reduces the susceptibility of Cr–Ni–Fe alloys to stress-corrosion cracking in chloride solutions. Chromium content also affects cracking susceptibility but to a lesser degree. Stress corrosion susceptibility in caustic solutions is affected by these alloying elements in a different way. The results are discussed in relation to currently proposed theories of stress-corrosion cracking.     

Untersuchungen zum Verhalten von Hochtemperaturwerkstoffen gegenüber Aufstickung

Investigations of nitridation behaviour of high temperature materials Furnace rolls and inner tube walls of industrial bright annealing furnaces are often subject to attack by nitrogen atmospheres. In order to select appropriate materials for application in nitriding atmospheres, three commercial stainless steels (AISI 314, alloy DS, alloy 800H) and four nickel base alloys (alloy 45-TM, alloy 600H, alloy 601H and alloy 602CA) with different concentrations of nickel, chromium, silicon and aluminium were exposed to both N₂/H₂ gas atmospheres at temperatures of 1000°C, 1100°C and 1200°C. The impact strength, the mass change due to nitrogen pick-up and the depth of internal nitridation were determined after exposure. At 1000°C nitrogen pick-up and loss of impact strength, was low for all alloys investigated. At 1100°C and 1200°C, however, all alloys suffered internal nitridation. Both internal nitridation and loss of ductility were more severe in the iron base alloys than in the nickel-base alloys. The corrosion attack by nitridation decreased with increasing nickel content. The highest resistance to nitridation was found in the nickel base alloys 600 H and 602 CA.     

铜阻尼合金的研究和发展现状

对CuAlMn系阻尼合金近几年的研究现状作了概括和描述，系统地介绍了该合金的相图、结构，详细探讨了相变点、阻尼性能的影响因素，对晶粒粗大问题也做了分析。并指出了CuAlMn系阻尼合金的应用及发展前景。     

Diffusion welding of components made of creep-resisting alloys (part 1)

The efficiency of diffusion welding components made of nickel creep-resisting alloys is confirmed. It is proposed that to increase the mechanical properties and decrease the extent of plastic deformation of components and also prevent the softening of the welded nickel creep-resisting alloys welding should be carried out using nickel interlayers.     

阻尼减振合金的研究现状

本文综述了阻尼减振合金的研究现状。包括几种典型的阻尼减振合金的成分和特点，以及使用过程中应注意的问题，还简要的说明了它们的阻尼机制。最后展望了阻尼减振合金的发展和应用前景。     

Ti-Ni基形状记忆合金及其应用研究进展

综合评述了Ti-Ni基形状记忆和超弹性合金的特性及其应用研究进展.着重介绍了Ti-Ni基合金的相变与性能特点及其影响因素,论述了Ti-Ni合金在建筑工程、生物医学及现代工业上的应用现状,并就该研究领域的发展方向提出了一些看法.     

Ni-Cr-Fe系高温合金的渗氮工艺研究

对Inconel 718、GH4145、R26三种不同成分的高温合金进行了渗氮处理,采用金相法和硬度梯度法研究了不同化学成分和不同工艺对气体渗氮层深度的影响.结果表明,随着合金中镍含量的增加,渗氮层深度减小,减少幅度达到50%～100%.     

Nickel-induced strengthening of boron-doped FeAl (B2) alloys

The effect of nickel additions on yield stress temperature dependence as well as on deformation mechanisms was investigated for Fe–Al alloys containing 40% Al. A set of different nickel containing alloys (up to 10 at.%), B-doped or B-free, was deformed in compression up to 950 °C. Subsequent dislocation structures were examined. It was shown that the addition of nickel strongly decreases the solid state solubility of boron in FeAl (B2) alloys. On the microscopic scale, nickel was confirmed to clearly decrease the dissociation width of the 〈111〉 superdislocations. From a mechanical point of view, it was shown to induce a large and linear strengthening at low temperatures (<400 °C). Owing to that specific hardening, the yield stress anomaly, usually occurring in such materials, was observed to be blurred out, but was nonetheless revealed by a zero strain rate sensitivity.     

Electrochemical behavior of copper-nickel alloys in acidic chloride solutions

The electrochemical behavior of Cu-Ni alloys in acidic chloride medium was investigated. Commercial Cu-Ni alloys were investigated using potentiodynamic techniques, complemented by electrochemical impedance spectroscopy. The influence of alloy composition, chloride ion concentration and immersion time on the electrochemical response of the alloys was analyzed. Results of present investigations with pure metals (Cu and Ni) are also considered in this paper for the sake of comparison. Potentiodynamic measurements reveal that the increase in nickel content decreases the corrosion rate of the alloy and when the nickel content exceeds 30%, an increase in the corrosion rate was recorded. Also, the corrosion current density increases with increasing the concentration of chloride ions up to 0.6 M.The experimental impedance data were fitted to an equivalent circuit model representing the electrode/electrolyte interface. The relevance of the proposed model to the corrosion/passivation phenomena occurring at the electrode/solution interface was discussed.