Thermodynamic and kinetic consideration on the corrosion of Fe, Ni and Cr beneath a molten KCl-ZnCl2 mixture

Thermogravimetric (TG) experiments have been carried out to study the kinetics of hot corrosion of Fe, Cr and Ni, covered by a molten KCl-ZnCl₂ mixture of a composition close to the eutectic (50 mol% KCl-50 mol% ZnCl₂). Furthermore binary and ternary phase diagrams were calculated in order to describe the corrosion process. The tests were conducted at a temperature of 320 °C in an atmosphere consisting of argon and oxygen. For iron different stages are observed in a TG curve. They can be attributed to the different reaction steps of iron chloride formation (incubation phase), oxide precipitation (linear stage) and scale formation (parabolic or logarithmic stage). Based on these observations a model, described by Spiegel [A. Spiegel, Molten Salt Forum 7 (2003) 253], is confirmed. For Cr and Ni these stages are not observed. At 8 vol% O₂ only slight oxidation of Cr and Ni was observed accompanied by evaporation of the salt deposit. At 16 vol% O₂ the rate of oxidation increases and the experiments yield a curve that is either parabolic or logarithmic for both Ni and Cr. As a result it is shown that the solubility of iron chloride in the KCl-ZnCl₂ melt is higher than the solubility of nickel chloride and chromium (III) chloride in the KCl-ZnCl₂ melt. This enables a higher diffusibility of iron chloride to the upper region of the melt where a higher oxygen partial pressure (p(O₂)) is present leading to a higher oxidation rate of iron.     

家电产品常用板材的选用

本文首先介绍国内和日本、德国、俄罗斯等国冷轧薄钢板及镀锌薄钢板的牌号、标记识别及生产地及与我国家标准薄钢板牌号的相互之间的关系，并比较具体地介绍冷轧板的实效性、镀锌薄钢板的锌层特性等诸多方面的状况。从而帮助我们在设计、制造家电产品中，比较正确地选择合适的板材。     

Aggregate States and Energetic Disorder in Highly Ordered Nanostructures of para‐Sexiphenyl Grown by Hot Wall Epitaxy

We report on photoluminescence (PL) and thermally stimulated luminescence (TSL) in highly ordered nanostructures of para‐sexiphenyl (PSP) grown by hot wall epitaxy (HWE). A low‐energy broad band is observed in the PL spectra that can be attributed to the emission from molecular aggregates. While the intrinsic exciton emission in steady‐state PL dominates at low temperatures, the emission from aggregates increases with elevating temperature and its magnitude depends sensitively on film preparation conditions. Time‐resolved PL measurements showed that the aggregate emission decays with a life‐time of ≈ 4 ns, which is approximately an order of magnitude larger than the lifetime of singlet excitons. TSL data suggests the presence of an energetically disordered distribution of localized states for charge carriers in PSP films, which results from an intrinsic disorder in this material. A low‐temperature TSL peak with the maximum at around 30 K evidences for a weak energy disorder in PSP films, and has been interpreted in terms of a hopping model of TSL in disordered organic materials.     

注高温热水管线缓蚀,阻垢实验研究

针对辽河油田高凝油区块注高温热水(85—95℃)引起的腐蚀、结垢,开展了室内和现场缓蚀、阻垢试验;分析了不同温度下注水的腐蚀情况,对比、考察了不同的缓蚀剂、阻垢剂及其复配物,得出了如下认识:在注高温热水条件下直接采用常温下使用的防腐蚀、防垢方法是不可行的,必须有针对性地进行高温条件下防腐蚀、防垢的实验研究工作。     

Effects of thermal oxidation conditions of silicon electrodes on cathodic electrochemiluminescence of Ru(bpy)3 chelate

Hot electrons emitted from thin oxide film-coated heavily doped silicon electrodes by cathodic pulse polarization can induce electrochemiluminescence from luminophores. The intensity of electrochemiluminescence produced at the electrode surface is dependent on the features of thin oxide films formed by thermal oxidation. As a preliminary study, we investigated the effect of thermal oxide growth conditions on the intensity of electrochemiluminescence produced at these electrodes, such as oxidation atmospheres, oxidation temperature, oxidation time and pre-treatment of wafers, using ruthenium(II) tris-(2,2′-bipyridine) chelate as a model luminophore. Optimal oxidation conditions of heavily doped silicon electrodes were obtained for the generation of intense electrochemiluminescence at this kind of silicon electrodes.     

基于遗传算法的工作辊温度场参数优化模型

针对热连轧机工作辊热辊形计算中温度场模型的热交换等参数难以确定的问题 ,建立了基于遗传算法的参数优化模型 ,可以解决复杂条件下的热参数的求解问题。利用优化参数计算的轧辊温度场与实际测量结果一致。     

南（昌）长力钢铁公司优化热送热装率生产实践研究

通过对南（昌）长力钢铁公司2号铸坯机以及棒材生产线轧钢产能分析，优化转炉2号铸坯机一轧钢工序产能合理匹配；提高热送热装率的优化技术，该技术的应用不仅提高了棒材生产线生产能力而且节约能源。     

聚酯装置熔体过滤器的国产化改造

熔体过滤器为聚酯装置关键设备,其国产化问题一直未能解决。该文通过对天津分公司200kt/a聚酯装置熔体过滤器改造方案的介绍,探讨了其国产化条件,分析了国产熔体过滤器的结构特点,并与进口过滤器进行了对比,提出了一些看法。     

铁水喷镁脱硫技术的应用

简述了涟钢铁水喷镁脱硫技术的设备概况、工艺流程和试生产情况。重点介绍处理过程的反应机理和控制方法，通过调整和改造，解决了钢水回硫的问题，实现了铁水脱硫-转炉-RH精炼炉-CSP的匹配。     

柳钢混铁炉炉衬结构及运行管理的技改实践

针对混铁炉使用过程中出现的各种侵蚀状况，设计采用砖砌十浇注复合炉衬结构，特别对前墙拐角和后墙中段等侵蚀快的关键部位作了有针对性的技术改进；在运行管理上，制定推行全新的工艺操作规程，取得了显著的使用效果。