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目的 分析研究铝及铝合金在自然水环境中的腐蚀行为。方法 通过开展LM3纯铝、5083铝、LF6M去包铝及带包铝在淡海水交替、海水及淡水自然环境下2 a的暴露试验,将3种环境下材料的腐蚀形貌、腐蚀速率进行对比。总结4种铝及铝合金材料在不同水环境下的腐蚀规律,对其腐蚀机理进行简要的探讨,并对其长周期的腐蚀行为进行预测。结果 通过对4种材料局部腐蚀协同影响因子(b)的对比可以发现,淡水环境对LM3纯铝局部腐蚀的影响最大,淡海水环境对5083铝合金局部腐蚀影响最大,淡水及淡海水环境对2种LF6M铝合金材料局部腐蚀的影响都很大。结论 5083、LF6M带包铝及去包铝,在淡海水交替自然环境下的耐蚀性能最差,LM3纯铝在淡水环境下耐蚀性能最差。 相似文献
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对NiTi形状记忆合金的多种加工方法如锻造、热挤压、轧制和拉拔、冷加工、粉末成形、包套碎片挤压成形、溅射沉积加工等进行了详细介绍。 相似文献
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在试验确定的工艺技术参数的基础上,分别以工业级Al(0H)3、浮游物Al(0H)3和“碳酸铝”为原料,进行了一步酸溶聚合法制取高效液体聚氯化铝的工业试验。从温度、压力、反应时间、盐酸浓度、配料系数几方面对反应的影响进行了阐述,提出了生产高效液体聚氯化铝的合理工艺技术条件。此外,还用实例证明,对聚氯化铝产品,不必过高追求其盐基度的高低,而更应注重其实际净水效果。 相似文献
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针对传统碱式氯化铝生产的固液分离难,盐基度低,设备防腐难等问题,改用碳酸铝替代结晶氢氧化铝,并引进铝,钙复合料调适盐基度,实现了易溶,节能,产品盐基度高的目的,使该生产厂PAC生产开创新局面。 相似文献
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本文就某电解铝生产企业对侧插自焙阳极电解槽工艺一氧化碳排放问题之异议,采用“非分散红外吸收”实测法及从原材料入手结合工艺过程分析法,对该生产工艺一氧化碳排放进行了系统研究,结果表明:侧插自焙阳极电解生产铝确实排放一氧化碳,排放系数为103公斤/吨.铝。 相似文献
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产生并堆积于中国内蒙古西部的高铝粉煤灰,不仅占用大量土地资源,还造成了严重的生态环境问题,但因其含有丰富的铝硅资源,可通过制备铝硅系材料对其进行资源化利用.然而,类似这种固废资源化产品,其生产和使用全生命周期过程的环境影响却少有系统研究,尤其是重金属迁移转化所带来的区域环境风险.因此,本研究基于物质代谢和全生命周期分析方法,并结合Nemero污染指数和Hakanson风险模型,对高铝粉煤灰制备莫来石产品因重金属元素迁移可能带来的环境风险进行了系统研究.结果表明:物理球磨活化过程明显增加了高铝粉煤灰中各重金属的释放,80%以上的铁族元素(Cr、Mn)迁移到酸活化过程产生的聚铝残渣中,最终进入莫来石产品中的Cr、Mn、Zn、Pb、Cu分别为20%、9%、24%、22%、24%;另外,聚铝残渣的潜在生态环境风险较大,超过极强水平标准6.6倍,其中尤以Cr的风险最突出;硅酸钙产品重金属浸出毒性表现为Zn>Mn>Cu>Pb>Cr,莫来石产品重金属浸出毒性表现为Mn>Cu>Zn>Pb>Cr,但均远低于地下水质量标准限值.总体而言,尽管在制备莫来石产品... 相似文献
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The deformation inhomogeneity of flat wires produced with roll drawing process is analyzed. The effect of main process parameters, i.e., initial wire diameter, forming roll dimension and thickness reduction on deformation inhomogeneity is established by means of experimental tests and a developed FE model. Vickers microhardness–strain relationship is developed for the analyzed material (low carbon steel AISI-1010) by correlating the microhardness measurements and effective strain fields as predicted by an axisymmetric numerical model of a compression test. A non-linear finite element model of roll drawing process is developed for a thorough understanding of process parameters effect on deformation inhomogeneity. Thus, in order to encompass the wide range of process conditions, an inhomogeneity index, calculated as the coefficient of variation of effective strain, is used. The numerical results showed that the inhomogeneity factor of flat wires produced with roll drawing is highly dependent on area reduction. 相似文献
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详细介绍了一种用圆钢线材经处理 ,轧制、热处理、精轧成门窗五金件生产用圆盘窄带钢的新生产工艺和设备 ,以提高窄带钢轧制精度、表面质量 ,减少设备投资 ,同时介绍了国内外的应用情况。 相似文献
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《Journal of Manufacturing Processes》2008,10(1):12-20
An experimental program of a novel wire manufacturing process known as dieless drawing has been conducted. The process has the capability to effect a reduction in the diameter of a wire without the use of conventional wire drawing dies. Reduction in diameter is achieved by heating the wire, which is mechanically loaded parallel to its longitudinal axis, to a temperature that initiates plastic deformation. Both mathematical and finite element (FE) modeling of the process have been undertaken. An analysis of the wire deformation is presented and discussed. The maximum reduction in diameter achieved, effect of drawing velocity, temperature, and uniformity of resulting wire diameter are investigated. The mechanics and operational features of the experimental machine manufactured to facilitate the experimental program of dieless drawing are described. The mathematical model presented can be used to describe the occurrence of deformation during the process. This model has been validated by experiments carried out on the wire drawing machine. The primary observation from the experimental program was that uniformity of wire diameter after dieless drawing decreased with an increase in reduction ratio. Results obtained from the experimental work confirm that a complicated interdependence of the process parameters exists during the dieless drawing process. 相似文献
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Jenn-Terng Gau Sujith Teegala Kun-Min Huang Tun-Jen Hsiao Bor-Tsuen Lin 《Journal of Manufacturing Processes》2013,15(2):298-305
The needs of stainless steel 304 micro cups have been increasing tremendously due to the trend of miniaturization in medical and electronic devices, etc. For application purpose, it is highly desired to have stainless steel micro cups with high CH/OD (cup height/outer diameter) ratios. Due to the constraints of the limit draw ratio (LDR) of stainless steel 304 sheets in micro deep drawing, forming a micro cup with high CH/OD ratio at room temperature cannot be achieved by using a single stage deep drawing die. A process consisting of one micro deep drawing and two ironing stages was proposed for achieving this goal; three micro dies were designed, fabricated and used for experimental validation. A series of experiments were conducted by using the stainless steel 304 sheets of 200 μm thickness annealed at four different temperatures to understand the influence of size effects on this process for generating knowledge, know-how and technologies to form high quality stainless steel micro cups with large CH/OD ratio. No lubricant was used in this study. It was proven that the proposed process is a robust process as long as the sheets are annealed at the temperature no less than 900 °C for more than 3 min. 相似文献
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竹产业既是传统行业又是新兴产业,在国家提倡的节能减排和环境保护过程中扮演重要角色.通过分析竹产业的现状,十分有必要给竹产业企业建立MFCA账户.同时,通过对浙江S拉丝企业的MFCA分析,建议S竹拉丝企业在能量损耗和机械折旧率控制上减少不必要的消耗,如精准控制无聊投放的时间节点,并且减少系统资源成本,积极与当地政府沟通,达成在政策层面有效支持节能减排和环境保护的推广,如与环境紧密关联的负产品处置补贴等. 相似文献
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