Cu-Ni合金腐蚀行为的宏观电化学研究进展

综述了Cu-Ni合金腐蚀行为的宏观电化学的国内外研究进展.介绍了合金成分、外界环境、腐蚀产物膜及初始表面膜等因素对Cu-Ni合金耐蚀性能的影响,详细介绍了合金元素通过影响腐蚀产物膜的组织结构从而影响腐蚀过程的各种理论,针对目前Cu-Ni合金腐蚀行为的研究不足作出了适当的分析并指出了今后的研究方向.      

精密铜镍合金生产线信息管理系统设计

针对某企业精密铜镍合金生产线各设备信息孤立的问题,提出了信息管理系统的设计规划,通过建设一套生产过程实时监控与MES系统,以实现生产线生产过程管理的实时化和综合自动化。     

Composition and thickness of surface oxide films on aluminum alloy granules

Conclusions The composition of oxide layers on granules is affected most by magnesium, the magnesium content of the layers being strongly dependent on the conditions of casting of granules. The thickness of surface oxide films on aluminum alloy granules produced by vibratory casting in water does not exceed 5–6 nm. In the casting of granules in water it is necessary to control the latter's impurity content. This applies particularly to closed water circulation systems, in which the degree of contamination of water increases with time.Translated from Poroshkovaya Metallurgiya, No. 8(260), pp. 4–9, August, 1984.     

Composition and corrosion resistance of cerium conversion films on 2195Al-Li alloy

The Ce conversion films on 2195Al-Li alloy without and with post-treatment were studied and the corrosion resistance was evalu-ated as well. The surface morphology was observed by scanning electron microscopy (SEM), and the chemical composition was characterized by X-ray photoelectron spectroscopy (XPS). The corrosion behaviors of 2195Al-Li alloy and conversion coating were assessed by means of potentiodynamic polarization curves. The experimental results indicated that after post-treatment the surface quality was improved signifi-cantly. According to XPS, the conversion coating after post-treatment was mainly composed of CeO2, Ce2O3, Ce-OH and a little MoO3 and MoO2. The results of potentiodynamic polarization curves revealed that the conversion coating with post-treatment possessed better corrosion resistance than bare alloy and Ce conversion coating without post-treatment.     

Cu-Ni/P双层镀研究

实验研究了化学镀cu-N/P 双镀层和传统的Ni/P镀层在表面形貌、耐蚀性能和硬度方面的差异.结果表明,Cu-Ni/P双镀层比Ni/P镀层具有更好的耐蚀性能和更高的硬度.     

铜镍合金冷凝管产品市场分析

铜镍合金冷凝管主要用于电力、石油化工、造船、海水淡化和海洋工程等行业。铜镍合金冷凝管在舰船、海洋工程、海水淡化行业具有不可替代性，不锈钢管和钛管无法替代铜镍合金冷凝管在这些领域的应用。在火力发电行业，不锈钢管具有与汽轮机几乎等同使用寿命的优点，具有替代铜镍合金冷凝管的趋势。不锈钢管用于冷凝器的主要缺点是导热性能低，随着社会对提高设备节能性能的要求越来越高，铜镍合金冷凝管的优势越来越显现。     

Cu-Ni双金属负载凹凸棒土催化剂的研究

以Cu-Ni为活性组分,以凹凸棒土(ATP)为载体,采用沉淀法制备了新型的Cu-Ni/ATP负载型双金属;采用扫描电子显微镜(SEM)分析了载体和负载催化剂的微观形貌;利用气相微反应装置对负载Cu-Ni型催化剂的催化活性进行了测试;通过气相色谱对反应产物进行了在线检测,在此基础上考察了Cu-Ni负载量对催化剂催化性能的影响。结果表明:Cu-Ni/ATP催化剂有较好的催化作用。     

Computational modeling of laser welding of Cu-Ni dissimilar couple

A three-dimensional transient model to solve heat transfer, fluid flow, and species conservation during laser welding of dissimilar metals is presented. The model is based on a control volume formulation with an enthalpy-porosity technique to handle phase change and a mixture model to simulate mixing of molten metals. Weld pool development, solidified weld pool shape, and composition profiles are presented for both stationary as well as continuous laser welding in conduction mode. Salient features of a dissimilar Cu-Ni weld are summarized and thermal transport arguments are employed to successfully explain the observations. It is found that the weld pool shape becomes asymmetric even when the heat source is symmetrically applied on the two metals forming the couple. It is also observed that convection plays an important role in the development of weld pool shape and composition profiles. As the weld pool develops, the side melting first (nickel) is found to experience more convection and better mixing. Results from the case studies of computation are compared with corresponding experimental observations, showing good qualitative agreement between the two.     

Preparation of Cu-Ni alloys through a new chemical route

A copper-nickel alloy has been prepared from an aqueous solution of the nitrates of copper and nickel, through co-formation of their ultrafine mixed oxides, by heating around 650 K followed by reduction with hydrogen at a very low temperature (below 623 K). The effect of temperature (473 to 623 K) on the kinetics of the hydrogen reduction of the co-formed oxides of Ni and Cu has been studied. The activation energy of the reduction reaction has been calculated and found to be 35.8 kJ/mole. A mechanism for the kinetics of the process has been suggested. It has been possible to get high-purity Cu-Ni alloy powder (50 at. pct each) free of any detectable oxygen, from their co-formed oxides, by hydrogen reduction at 623 K in less than 20 minutes. Although the X-ray analysis of the co-formed oxides has shown separate peaks for CuO and NiO, the alloy powder has exhibited a single peak with a d spacing lying in between those of Cu and Ni. It is suggested that the alloying of the two metals has taken place during the H₂ reduction of nanosized oxide particles of copper and nickel, prepared by the aforementioned chemical route. The alloy powder has been sintered at 1273 K. The density and hardness of the consolidated alloy have been measured and found to be close to the theoretical values. The alloy has also been subjected to cold reduction and annealing, in addition to metallograph examination and characterization by a scanning electron microscope (SEM), to confirm the homogeneity of the alloy.