防腐锌铝合金的研究与应用

该文回顾了防腐锌铝合金的发展历程，阐述了合金元素及其对性能的影响，讨论了锌铝合金防腐镀层的结构及耐腐蚀性能，最后介绍了防腐锌铝合金的应用和发展前景。     

金属材料在高盐环境中的物理防腐性研究

目的:研究不同物理防腐涂层材料对高盐环境中金属材料的防腐性能。方法:以低碳钢Q235为基体材料,通过电弧喷涂技术在试件上喷涂三种材料,即锌涂层、铝涂层和锌铝涂层,然后在高盐环境中放置7个小时,记录涂层组织结构特征和腐蚀速度。结果:锌铝涂层的防腐性能要好于锌涂层和铝涂层的防腐性能。     

锌的主要用途

占世界锌总消耗量大约35%(包括锌废料)用于钢—铁结构的防腐保护层,20%用于黄铜,10%用于锌板,其它主要用于氧化锌和锌粉。锌涂料由于锌在高压、淡水和盐水以及有关的天然和人造材料中具有极好的防腐性能,因     

高铁接触网零部件超细片状锌铝防腐涂层应用研究

目前接触网典型金属件表面防腐技术各具优势的同时也各有弊端。本文主要对电弧喷涂超细片状锌铝涂层防腐新技术的保护膜形成与耐腐蚀机理进行阐述，并根据实际应用情况提出目前常用的金属表面防腐方法的不足。后续应用该防腐方法分别对材质为铝合金、碳钢和铜合金的典型高铁接触网零部件进行多种腐蚀试验。通过试验验证了电弧喷涂超细片状锌铝涂层具有优异的金属表面防腐性能，并且证明该技术在金属表面防腐领域具有一定的优势，为高铁接触网零部件表面防腐提供了更好的选择。     

省时高效的电镀新工艺

省时高效的电镀新工艺澳大利亚研制成功一种锌镍电镀新工艺．可最大限度地减少有害的化学反应物，特别是减少了高温、潮湿和海洋环境下的副作用，并且可以延长防腐期。试验表明，锌镍电镀物的防腐性能比锌电镀物高７倍。由于锌镍电镀层较薄，因而电镀时间、人力和材料均可...     

应当重视发展镀锌钢材

(一) 锌是一种防腐性质较好,价格比较便宜(国际市场为664美元/吨)的金属。在国外,钢材镀锌防腐是锌的主要用途之一(表1)。但我国锌的产最供不应求,所以使用得很少,象自来水管原应用镀锌铁管(白铁管),现一     

湿法炼锌中防腐技术及电解槽掏槽的机械化

沈阳冶炼厂锌冶炼车间从五十年代初投产以来,在设备防腐技术方面不断得到改进。五十年代一般采用铅材,火漆,橡胶作为锌电解中主要防腐材质。六十年代开始采用玻璃钢,聚氯乙烯及不锈钢。生产实践表明,上述几种防腐材质,一般是比重大,抗腐性能不够理想,并且价格比较昂贵。因此,车间停产检修     

热镀“Zn-4%Al-RE-Mn”合金及钢丝浸镀工艺

据统计全世界的钢每年腐蚀损耗占其总量的30％,足见钢铁防腐具有重大的经济价值。热浸镀锌方法对钢的保护性能及其技术经济指标,显著优于喷镀锌、电镀锌、富锌漆及粉镀锌层等保护法。世界热镀锌对锌的消费量已占总锌消费量的34％。对于锌资源     

降低阴极锌含铅的试验

介绍了电解锌生产现场单个电解槽试验中为降低阴极锌含铅所采取的措施；控制适当的电解条件，改善阳极防腐性能和除去溶液中的Ｃｏ＾－等，使电解锌的一级品率由７０％提高到了９０％。     

锌的前景

<正> 早先锌被用来制黄铜,这一用途虽然依旧重要,今天最大的锌市场是防腐。在市场经济国家中,镀锌的锌耗量占全部锌耗量的2/5还要多。若干新进展会进一步提高锌耗量。 由于更加重视防锈,预料汽车工业要增大镀锌钢的用量,每辆汽车上的用锌量将有较大的增长。此外,薄壁压铸法的进展将为锌打开新的市场。 将来的电动汽车要用镍—锌电池来驱动,可能     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.