不锈钢封接件电镀后绝缘电阻降低的处理措施

针对不锈钢玻璃封接件电镀后出现的绝缘电阻下降问题,结合实际生产进行原因分析并提出工艺改进措施。结果表明,通过电镀前对封接件进行预处理及电镀后处理工艺进行改进,能够将封接件绝缘电阻提高到稳定的5000 MΩ(U=500V)以上。保证了封接件绝缘性能的长期稳定,提高了不锈钢玻璃封接件安全可靠性。     

高性能环保不锈钢化学抛光剂的研制

针对常规不锈钢化学抛光刑的缺点,研制出了一种高性能环保不锈钢化学抛光剂配方。通过试验,得出了该配方的最佳工艺参数,并对影响抛光效果的因素进行了分析。经实践证明,经该工艺抛光后的工件表面可达到镜面光亮效果,而且生产过程中的废水处理简单,处理后对环境无污染。     

金属表面防护重大突破:铁变“不锈钢”新工艺

最近，一种环保型金属自催化液在武汉市华天新技术开发公司研制成功，并已通过国家产品质量、环保部门检测，同时已申报国家发明专利。普通钢铁在催化液中浸泡３０～５０ｍｉｎ，即变成光亮的“不锈钢”，耐酸碱腐蚀、耐磨损、不脱落、硬度提高２～５倍，成本仅为不锈钢的１／４，在加工过程中，不需电极，无电镀工艺中的有毒气体、废液排放现象，同时还能对非金属表面进行处理，同样达到不锈钢效果。该技术属金属表面防护重大突破，是淘汰对环境污染严重的传统电镀技术理想绿色环保产品。金属表面防护重大突破:铁变“不锈钢”新工艺     

电镀故障中的假象及其识别

1电镀故障中的假象1.1关于故障中的假象问题从下述三个实例,可了解电镀故障中的假象。实例1自行车瓦盖又称挡泥板,电镀铜/镍/铬。工艺流程:镀前处理预镀镍光亮硫酸盐镀铜全光亮镀镍。在电镀过程中发现镀件从光亮镀铜槽出来后,铜镀层呈镜面光亮。经过镀光亮镍后,发现光亮镍镀层表面出现白块、白条等疵病。当时给操作者的感觉是故障出在光亮镀镍工序。经查找,光亮镀镍工序没发现问题,故障仍未解决。起初为了维持生产,镀完亮镍后只得进行抛光,但过了几天后抛光也不行了,不得不查找电镀亮铜工序。发现镀铜液中十二烷基硫酸钠含量偏低而引起的故…     

一例酸性光亮镀铜故障处理

1 前言 酸性光亮镀铜工艺具有镀液成份简单且容易控制、镀液整平性及分散能力好、电流密度范围宽、镀层光亮性好、成本低以及废水处理简单等优点,特别在箱包五金件和塑料电镀件上得到广泛应用.通过多年的工艺实践,镀层是否达到镜面光亮,规范操作至关重要.下面介绍一起广东江门某大型电镀厂在生产中遇到的由酸性光亮镀铜引起的电镀故障处理,并提出一些规范的操作建议.     

柠檬酸盐镀光亮厚铜工艺在自行车电镀生产中的应用

以柠檬酸盐光亮厚铜作为底层,以单层光亮镍铁合金作中间层,表面套铬,组成Cu/单层Ni-Fe/Cr组合镀层代替单层,双层或多层Ni-Fe/Cr工艺,构成一种新型的防护装饰镀层。本文着重就柠檬酸盐镀光亮厚铜的工艺配方,镀液和镀层性能以及在自行车电镀生产应用的技术经济效果等作一简单介绍。     

酸性光亮镀铜故障的分析处理

1　前言　　酸性光亮镀铜工艺具有镀液成份简单且容易控制、镀液整平性及分散能力好、电流密度范围宽、镀层光亮度高以及废水处理简单等优点。随着电镀工艺技术的不断提高,酸性光亮镀铜已成为装饰性电镀产品的必选镀种之一,特别是对于一些小五金件和塑料电镀件。通常采用Cu Cu Ni Cr、Cu Cu Ni Ag、Cu Cu Ni Au等体系。镀层最终能否达到镜面光亮的效果,主要取决于酸性光亮镀铜质量的好坏。下面介绍一起在实际生产中遇到的由阳极钝化而引起的故障,经过认真的分析研究,故障得以排除。2　故障现象　　(1)出光时间长,光亮度差。实际出现镜…     

成都开华化工研究所

<正>作为表面处理产品的研发、生产和销售的专业公司,开华拥有高素质的专业人才,为客户提供完善的技术服务,同时建立了严格的质量管理与保证体系,通过了ISO9001认证。开华以全新的服务带动优质的产品,以优质的产品促进与客户的共同发展。开华一您值得信赖的品牌!重点产品介绍:ZF302/ZF303酸性光亮镀锡添加剂光亮度好,光亮范围宽,深镀能力与整平性能优良,出光速率快。可焊性能、防变色性能好,特别适宜于电子元器件或五金装饰件光亮电镀纯锡。镀液稳定,能满足高强度连续运转,镀液不会浑浊,勿须再用稳定剂。ZF302单一开缸:40ml/L;ZF303开缸:ZF303开缸剂30~40ml/L,ZF303辅助剂1~5ml/L。     

不锈钢化学镀银速率的研究

以酒石酸钾钠为还原剂,在304不锈钢表面进行了化学镀银,研究了化学镀银液的配方组分、镀液pH及温度等工艺参数对化学镀银速率的影响.较理想的化学镀银工艺为:硝酸银20g/L,氨水80mL/L,酒石酸钾钠100g/L,pH 12.5,温度20℃.在该工艺条件下得到的镀银层均匀,致密,结合力好.     

金属非金属常温镀液研制成功

一种可替代传统电镀工艺的新技术———环保型常温表面合金镀膜液 ,近日由山西曲沃新型工艺制品厂研制成功 ,并投放市场。这种新型表面合金镀膜液 ,无毒、无味、无三废污染 ,使用方便快捷、不需电源 ,不需加热。可直接将所需镀膜的金属、非金属材料放置在镀膜催化液中浸泡 50ｍｉｎ即可。处理后的镀件与电镀、喷塑、烤漆表面一样光亮如镜、色彩斑斓 ,它既保持了金属原有的机械性能 ,又可提高表面硬度2～ 5倍 ,表面镀层均匀致密、不起皮脱落、无麻点气孔、永不生锈 ,成本仅为电镀的 1 /2、不锈钢的1 /4,集装饰、防腐、耐磨性能于一体 ,广泛用…     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。