质精致新 筑梦中国 BICES 2015筹备情况概览

BICES 2015（第十三届中国（北京）国际工程机械、建材机械及矿山机械展览与技术交流会）将于2015年9月22—25日移师北京中国国际展览中心新馆（新国展）举办。展会同期还将举办IVEX 2015第四届中国-北京国际商用车博览会以及中国国际应急抢险救援装备展。     

积极履行CSR 日立建机续写绿色公益篇章

经过10年的精心培育,日立建机公益林已蔚然昌盛。2014年8月20日,日立建机（上海）有限公司与一众伙伴们再次来到内蒙古科尔沁地区,为前10年的10万m^2公益林绿化工作做总结,并见证今后10年13万m^2新公益林的开始。     

精细化服务看三一泵送

正"2014年,工程机械企业要靠什么来实现增长?"估计这是行业内各个企业的高层考虑最多的问题。中国经济要增长、产业要增长、工程机械企业必然也要增长。那么,作为仍旧以本土市场为主战场的中国工程机械企业,增长的源动力究竟在何处?我们看一家企业是否增长,通用指标大都是2个:营业收入和利润。当前,国内企业大都看中营业收入的增加,或     

光电对抗效果评估方法研究

光电对抗效果评估是当前光电对抗领域的研究热点。系统梳理了光电对抗效果评估的相关概念,概括总结了光电对抗效果试验方法,着重阐述了光电对抗效果评估准则,并具体介绍了针对不同光电对抗系统的效果评估准则。研究成果对完善光电对抗效果评估的理论和规范及其应用具有一定的参考价值。     

Preparation and Corrosion Resistance of Anodic Oxidation Coatings on 2198 and 5A90 Al-Li Alloys

2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18%H_2SO_4solution(Solu.A) and the mixture solution of 18%H_2SO_4+5%C_2H_2O_4(Solu.B) at room temperature. 12 and 11 V was optimized as the applied oxidation potential for 2198 and 5A90 alloys, respectively. Cross-sectional morphology, surface morphology and elements distribution of anodic oxidation coatings were observed by scanning electron microscope equipped with energy dispersive X-ray analysis(SEM/EDX). Corrosion resistance was tested by potentiodynamic polarization plot in 3.5%NaCl solution. The results showed that the thicknesses of coatings obtained at the selected potential in Solu.A and Solu.B were about 50 μm/110 μm for 2198 alloy and 80 μm/110 μm for 5A90 alloy. In both solutions, anodic oxidation coatings of 2198 alloy were primarily composed of Al oxides; those of 5A90 alloy were mainly consisted of Al oxides and a small amount of Mg oxides. The results of potentiodynamic polarization showed that anodic oxidation coatings of 2198 and 5A90 Al-Li alloys had better corrosion resistances than that of untreated alloys.