共查询到20条相似文献,搜索用时 125 毫秒
1.
钛阳极由于其优异的电催化活性和耐蚀性得到了广泛应用.但钛基体导电、导热性能不好,造成了安装部位接触电阻过大,局部温度过高,缩短了钛阳极使用寿命.为了降低钛阳极安装部位的接触电阻,可以在安装部位进行局部电刷镀银.本文研究了电刷镀银工艺,获得了电刷镀银工艺参数:AgNO3100~180g/L,稳定剂100~150g/L,(NH44)2S2O3 250~300 g/L,工作电压4~10 V,镀液温度20~30℃,相对运动速率5~12m/min.阳极寿命由原来的10~12个月延长到12~15个月. 相似文献
2.
1前言 钛具有比强度高、耐腐蚀性能好等优点,广泛应用于石油、化工、航空、电子等工业中.由于钛表面极易形成致密、不导电的氧化膜,常采用钛上镀银改善钛的导电性及钎焊性能[1,2],扩大钛的应用范围,而钛表面极易形成的钝化膜给钛上电镀带来很大难度,使钛成为难镀金属.因此,钛基体表面预处理是钛上镀银的关键技术. 相似文献
3.
4.
传统的导电排的电镀工艺是采用挂镀技术,但电刷镀技术在导电排电镀工艺中的应用越来越广。介绍了电刷镀导电排的设备、工辅具、溶液及工艺,提出了克服导电排电刷镀缺点的方法。改良的电刷镀工艺对导电排镀层质量有明显提高,可实现批量、自动化生产。 相似文献
5.
6.
特殊要求的铁件镀银工艺毕平强,韩连发,彭英长(河南新乡市755厂,453069)1前言我厂由于某军品零件的特殊需要,不得不在带有丝扣和直棱角的钢铁工件上镀银,镀件要求有良好的导电、耐磨和焊接性能。电镀加工后的镀件还须经250℃、15s时间的注塑(10... 相似文献
7.
发电机导电螺栓机械加工后外表面需电镀银以增强导电能力。螺栓的材质一般是钢铁基体。常规钢铁件镀银工艺为除油~除锈一活化~预镀碱钢一镀银。生产中我们发现此工艺镀银后,零件表面易出现锈蚀现象。为此,通过实验研究,我们采用镀锌层作为过渡层,较好地解决了这一问题。1常规镀银工艺产生锈蚀现象的原因及解决的办法导电螺栓镀银因配合尺寸的要求,镀层一般较薄,在10-2()m。常规的镀银工艺中,镀铜层和镀银层相对铁基体均为阴极性镀层,不能对铁基体起到电化学保护作用。阳极性镀锌层作为过渡层,在电化学保.护中,锌层起牺牲阳… 相似文献
8.
9.
10.
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
12.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
13.
醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献
14.
15.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
16.
17.
19.
20.
A Review of Contemporary Views of Theories of Adhesion 总被引:2,自引:0,他引:2
K. W. Allen 《The Journal of Adhesion》1987,21(3):261-277
The once distinct and independent theories of adhesion have been losing their isolation and converging. Ideas of the effects of surface roughness, once dismissed as irrelevant except in the case of textiles, have been revised; albeit on a smaller scale as details of surfaces have been revealed by sophisticated techniques. Electrostatic interactions across an interface have been more deeply explored and their significance recognised and expounded. Diffusion of groupings and chain segments within a polymer have been related to the possibilities of interaction with a variety of surfaces. Perhaps most important, theories of adsorption have been extended in depth. The precise nature of the molecular interactions have been recognised and quantified. In doing this the contribution of diffusion and elastoplastic phenomena have been integrated. These developments are collated and analysed to present the present understanding of the concepts. 相似文献