浸渍镀仿金工艺

采用硫酸铜,硫酸亚锡为主盐的置换反应浸地在钢铁件表面制得金黄色铜锡合金层。通过添加含氟系阴离子及羟基系阴离子的络合剂,控制铜,锡离子的置换反应速度,获得15％－39％铜含量的合金镀层,外观呈18－22K金色,膜层结合力好,耐蚀性优良。     

酸性光亮镀铜的预处理工艺

酸性光亮镀铜的预处理工艺尚书定（中原电镀技术实业公司，４７３０８２）１前言在钢铁件、钢管、锌合金件上直接酸性镀铜时，常因存在置换铜而使镀层结合力限差。在生产中经常采取预镀或预浸措施来解决这一问题。下面将几种比较实用的预处理新技术详述如下。２预镀镍工艺...     

电镀铜系列添加剂的研究

1　前言在钢铁制品表面电镀铜层属阴极性镀层 ,对基体没有电化学保护作用 ,一般不做为防护性的装饰性镀层使用 ,主要用于底镀层或中间镀层 ,如电镀铜/镍 /铬、电镀镍 /铜 /镍 /铬等 ;此外 ,还用于恢复零件尺寸、防止局部渗碳、印刷电路和电铸等方面 ;另外 ,还广泛作为提高锌铸件、铝合金铸件、铝件及铝锡合金等制品的装饰性镀层的结合强度的预镀层。可见 ,电镀铜是一个十分重要的镀种。常用电镀铜工艺有碱性氰化物镀铜、硫酸盐镀铜、焦磷酸盐镀铜、柠檬酸盐镀铜和ＨＥＤＰ镀铜等 ,而碱性氰化物镀铜和硫酸盐镀铜是最常用的 ,下面将作重点讨论…     

防渗电镀铜工艺实践

防渗电镀铜工艺实践文斯雄（贵阳市１０２８信箱,５５０２０５）１概述氰化物镀铜与酸性硫酸盐镀铜、焦磷酸盐镀铜相比较,镀层结晶细致致密,孔隙率少,被广泛运用于机械制造业中钢铁零件的防渗碳、渗氮等。即将钢铁零件要渗部位采用耐酸碱的有机涂料予以绝缘保护,对非...     

置换镀铜-锡合金替代氰化物预镀铜工艺的探讨

铁件在由硫酸铜、硫酸亚锡、络合剂、稳定剂等组成的溶液中，可以置换镀覆不同锡质量分数的铜－锡合金镀层，其工艺可替代氰化物预镀铜，消除氰化物污染，是实现电镀清洁生产措施之一。     

路漫漫兮,无氰碱铜

无氰电镀利国利民。钢铁件要直接电镀无氰碱铜,置换问题易于解决,但要同时解决钢铁件的钝化问题却十分困难。只有提高无氰碱铜电镀的工艺性能,使其易于维护管理,才能经受大生产的长期考验,取得推广应用。在无氰碱铜电镀废水处理方面有待进一步深入研究。无氰碱铜电镀的方向是正确的,这条路还要继续艰苦地走下去。     

化学镀多功能铜镀层在电子工业中的应用

论述了多功能铜镀层化学镀液成份的作用及对镀层的影响。多功能铜镀层的组成,镀层的表面形态以及多功能铜镀层在电子工业中的应用。     

卤素化合物用于钢铁上无氰化学镀铜的研究

本文主要对卤素化合物如何用于钢铁上无氰化学镀铜的实验方法，机理等逐一进行了阐述，并给出了比较具体的实验方法及结论，特别对采用与拟卤素氰化物性质相似的卤素，抑制并控制钢铁件的强置换作用，用表面活性剂确保钢铁表面的活性以及在被铜覆盖前不钝化，达到提高结合力目的的机理方面作出了进一步的论证，从而可在相当广的范围内推行，其环保社会效益十分显著。     

第十五讲──电镀用直流电源(一)

分析了基于硫酸盐光亮酸性镀铜体系的钢铁件浸镀铜工艺工业化应用的不可行性,以及浸镀与电沉积相结合的酸性镀铜工艺的特点.介绍了酸铜光亮剂、钢铁件活化原理、无氰碱铜配位荆等研究的最新进展.指出HEDP无氰碱铜镀液具有化学活化作用,以及预浸能提高镀层结合力.     

无氰镀铜的实验研究与生产应用进展(一)

分析了基于硫酸盐光亮酸性镀铜体系的钢铁件浸镀铜工艺工业化应用的不可行性,以及浸镀与电沉积相结合的酸性镀铜工艺的特点.介绍了酸铜光亮剂、钢铁件活化原理、无氰碱铜配位荆等研究的最新进展.指出HEDP无氰碱铜镀液具有化学活化作用,以及预浸能提高镀层结合力.     

离子掩蔽法制备铜银双金属粉及其主要影响因素

本文在采用化学置换法制备铜银双金属粉的基础上,在制备过程中添加离子掩蔽剂,以最大程度地消除铜氨络合离子在铜粉表面的吸附,实现银在铜粉表面的连续包覆。同时分析了掩蔽原理及包摩尔比、覆量、温度对双金属粉导电性能的影响。实验结果表明:离子掩蔽剂法制备的铜银双金属粉末具备了优良的抗氧化性能,其主要影响因素为包覆量及摩尔比。     

工业纯铜陶瓷/渗铝复合涂层的制备及耐蚀性

以相同的陶瓷骨料(由TiO2、A12O3和Zn组成),在纯铜基材上分别制备热化学反应法陶瓷涂层和热化学反应陶瓷/渗铝复合涂层,通过X射线衍射和扫描电镜研究了2种涂层的组成和结构,并比较了两者的性能差异.结果表明,热化学反应陶瓷/渗铝复合涂层在热固化过程中除了产生机械和化学结合外,还产生了冶金结合,其致密性、结合强度均较...     

Adhesion of rubber compounds to nano-copper-coated iron plates as studied by AES depth profiles

Three nano-copper-coated iron plates with different thicknesses of the copper coating from 29 to 56 nm were prepared by sputtering and their adhesion properties to rubber compounds were examined. At the optimum cure of rubber, the nano-copper-coated iron plate with thick copper coating (56 nm) showed the best adhesion to rubber compound, whereas the thin copper coating (29 nm) showed the best adhesion to rubber compound at overcure. This may be explained as follows: at optimum cure, diffusion of iron to the copper surface in the adhesion interphase is dominant, whereas copper sulfide formation in the adhesion interphase is dominant at overcure. This fact was confirmed by Auger electron spectroscopy (AES) depth profiles of adhesion interphases using Ar⁺ ion sputtering.     

Scrap cast iron and copper‐modified cast iron for reductive degradation of 2,4‐dinitrotoluene

BACKGROUND: Little attention has been paid to the use of large‐sized scrap cast iron for reduction of refractory organic pollutants at neutral pH and in the presence of dissolved oxygen (DO). RESULTS: Scrap cast iron and copper‐modified cast iron with fresh surfaces have a high reactivity towards the reduction of 2,4‐dinitrotoluene (2,4‐DNT). The extent of conversion reached around 80% and 97% respectively, though it gradually decreased with repeated reactions to relatively stable values of 63% and 72%, and recovered once the reacted filings were cleaned by dilute acid. After 50 days reaction, no dissolved copper appeared in the copper‐modified cast iron process. The mass loss of copper due to physical detachment reached 1.1% of the total coated copper within the initial 20 reaction days, and only 0.3% appeared in the next 30 days. 2,4‐DNT oxidizes scrap cast iron to generate mainly FeFe₂O₄ with DO, however, it oxidizes scrap copper‐modified cast iron to generate mainly γ‐FeO(OH) and α‐FeO(OH). CONCLUSION: Both samples of cast iron were successfully applied in the treatment of neutral wastewater containing 2,4‐DNT with high reactivity and good repeatable efficiency. Electrode reaction rate was enhanced by the deposited copper, which has strong chemical and physical stability. Copyright © 2011 Society of Chemical Industry     

钢铁基体上无氰碱性电镀铜用配位剂的研究

分别以乙二醇、乙二胺四乙酸(EDTA)、氨水、缩二脲、柠檬酸盐及膦酸盐为配位剂进行无氰碱性镀铜试验。对不同镀液体系的稳定性、电导率及所得镀层的外观、结合力等进行了测试。结果表明,乙二醇、EDTA、柠檬酸盐及膦酸盐都可以作为碱性镀铜的配位剂,而氨水和缩二脲体系由于存在明显的置换反应,因此不适用于无氰镀铜体系。复合膦酸盐镀铜体系的综合性能最好,有望替代传统的氰化物镀铜体系。     

Action of iron and slag on the zirconia coating of the lining of submerged lances

Conclusions As the result of the physicochemical reaction between the zirconia coating applied to the lining of the submergible lances for addition of magnesium to molten iron in desulfurization of it and the molten metal and slag a dense crust of particles of zirconia and the nonmetallic phase formed as the result of the chemical reaction of the zirconia and the binder with the slag contained in the ladle with the molten iron is formed in the layer of coating. This prevents penetration of molten metal into the pores and cracks of the lining, reduces oxidation of its carbon-containing components, and increases life.Application of the zirconia coating to the lance lining eliminates manual coating of it with a refractory compound after treatment of iron.Translated from Ogneupory, No. 5, pp. 46–48, May, 1988.     

Novel copper immersion coating on magnesium alloy AZ91D in an alkaline bath

Copper immersion coating of magnesium alloys has, to date, been conducted only in acidic baths. This article describes a novel alkaline bath for copper immersion coating on AZ91D magnesium alloy. Prior to the coating process, a chemical etching process of the magnesium substrate was optimized using orthogonal experimental methodology. The copper immersion coating was then investigated with regard to the effect of pH and fluoride content in the deposition bath. It was revealed during the coating process that an increase of pH and fluoride content led to a surface film formation on the magnesium substrate. The surface film formation occurred simultaneously with copper reduction, rendering a controlled magnesium dissolution, thereby a controlled copper deposition. With optimized conditions of chemical etching and immersion coating processes, uniform copper deposits were achieved.     

某金铜矿区含铜废水处理试验研究

采用"石灰调整pH-铁屑置换-硫化沉淀"组合技术处理铜矿区酸性含铜废水,结果表明,控制铁屑置换时溶液的pH在2左右时,海绵铜的回收率达97.15%,置换后的溶液用石灰和硫化钠沉淀处理,余液中铜离子的去除率最高可达99.24%,处理后的水达到了排放标准。。     

电子工业用银包铜粉的制备现状及其应用

综述了制备银包铜粉各种方法的制备工艺及银包铜粉性能的研究现状,这些方法包括置换法、化学还原法、置换与化学沉积复合法及熔融雾化法。介绍了铜粉的预处理方法。列出了某单位采用置换与化学沉积复合技术制备的7种不同银含量的片状银包铜粉的技术指标。指出了银包铜粉的用途及其应用前景。