共查询到19条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
电沉积Ni-Co合金工艺条件的研究 总被引:1,自引:0,他引:1
研究了硫酸镍 -硫酸钴 -氯化钠体系中钴含量在 4 0 %以下的 Ni- Co合金镀层的影响因素。讨论了温度、p H、电流密度、Ni/ Co质量比、时间等因素对镀层沉积速度和腐蚀速度的影响。通过试验得出了电沉积过程的最佳工艺条件。 相似文献
6.
7.
采用循环伏安法研究了氯化物体系中锌-钴合金电镀的电沉积过程,采用X-射线厚度和成分分析仪测量了锌-钴合金镀层的厚度和钴金属质量分数.试验表明,在氯化钾锌-钴合金电镀槽液可以电镀钴质量分数为0.2%~0.4%的锌-钴合金,钴添加剂的加入,能够使氢的析出电位负移,扩大了锌-钴合金沉积的电位区间范围. 相似文献
8.
镍和钴为同一族的金属元素 ,具有非常相似的化学性质 ,在镍盐或金属镍中经常含有或多或少的金属钴。尽管镍和钴的化学性质很相似 ,但在电沉积镍和钴时 ,钴的沉积速度比镍的沉积速度要快得多 ,这种现象称为“不规则的共沉积”。因此 ,为了沉积低钴含量的 Ni- Co合金镀层 ,电解液中钴盐的浓度应该比较低一些。Ni- Co合金镀层比镍镀层的硬度高 ,有优良的磁性能 ,耐磨性及耐蚀性好 ,具有重要的实用价值 ,但是镀层的内应力较大 ,而且金属钴的价格昂贵 ,因而在实际应用中 ,合金组成的选择要兼顾镀层性能及经济因素。电沉积 Ni- Co合金镀层的电… 相似文献
9.
一引言从50年代开始,将低锡青铜合金工艺用于防护-装饰性代镍镀层,在我国实际生产中取得了良好效果,并积累了丰富的生产实践经验.电镀低锡青铜合金工艺中,电解液组份对电沉积合金镀层组织结构,镀层的外观质量有明显影响,而电解液的组份能否维护稳定状态,确保两种金属离子浓度正常比例,就与所采取的合金阳极的成份及物理性质有密切关系.因此应正确选择技术性能可靠的合金阳极,并应满足以下指 相似文献
10.
11.
在AlCl3-NaCl-KCl三元无机熔盐体系中,以1070工业纯铝为阳极,Q235钢为阴极,150℃下电镀处理,获得了银白色的镀层,镀层完整、均匀。并且研究了电镀时间对镀层形貌的影响。经SEM和EDS分析表明,镀层主要成分是金属铝的晶粒。从SEM照片来看,在一定的电流密度下,随着电镀时间的增加,晶粒尺寸呈逐渐增大的趋势。晶粒长大过程中,相邻的晶粒相互连接起来,其界限逐渐变得不清晰,形成了体积较大的不规则板块状结构。 相似文献
12.
13.
锡基合金有望替代碳成为新一代高容量锂离子电池的负极材料。Sn-Co合金是研究最为广泛的锡基合金负极材料之一,但该材料存在首次不可逆容量大、循环稳定性差等问题,限制了其实际应用。Sn-Co合金的电化学性能主要受Sn/Co比例、活性材料结晶形态、颗粒尺寸和电极结构等因素影响,纳米材料可提高电极循环稳定性,但易导致较大的首次不可逆容量,而多孔结构的Sn-Co活性材料或多孔结构的电极集流体,有利于电极综合性能的提高。Sn-Co合金中引入碳可明显改善电极的循环容量和循环稳定性。同时综述了Sn-Co合金负极材料的制备方法及其优缺点,并对锡基合金负极材料的发展方向进行了展望。 相似文献
14.
S. S. Abd El Rehim S. A. Refaey G. Schwitzgebel F. Tara M. B. Saleh 《Journal of Applied Electrochemistry》1996,26(4):413-418
Electrodeposition of Sn-Co alloys was carried out from baths containing 2–20 g dm–3 SnSO4, 4–18 g dm–3 CoSO4.7H2O, C6H11O7Na and K2SO4 under different conditions of bath composition, pH, current density and temperature on to copper substrates. The influence of these variables on the cathodic potential, cathodic current efficiency and composition of the deposit were studied. The results show that the deposition of Sn-Co alloys from gluconate baths depends greatly on the concentration of tin. At high tin concentrations, tin is the more noble component. At low tin concentrations, tin reduction is strongly suppressed due to the formation of a more stable Sn-gluconate complex species and tin becomes the less noble component. The codeposition of Sn-Co alloy from these baths can be classified as an irregular plating system. The surface morphology of deposits was examined by scanning electron microscopy and crystal structure by X-ray. The results show that the structure of the deposits was controlled by the alloy composition. 相似文献
15.
研究了化学镀Ni-Fe-Rh-P非晶态合金镀层的工艺,考察了镀液成分和工艺参数对沉积速率和镀层质量的影响。利用优化的工艺配方在经过敏化、活化处理后的纳米碳纤维(CNFs)表面沉积了Ni-Fe-Rh-P合金镀层,分别利用能量色散X射线谱(EDS)、X射线衍射仪(XRD)及扫描电子显微镜(SEM)等手段对镀层的成分、结构、形貌进行了表征,采用液相硝基苯催化加氢反应表征了制备催化剂的催化活性。结果表明,利用化学镀技术可以在纳米碳纤维表面负载连续、均匀的Ni-Fe-Rh-P合金镀层,且镀层为非晶态结构;负载型非晶态合金催化剂Ni-Fe-Rh-P/CNFs具有很高的催化活性和良好的循环使用性能。 相似文献
16.
17.
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. 相似文献
18.
The carbon-based lead foam was produced by electrodepositing a uniform and dense lead coating on lightweight carbon foam in fluoborate system under appropriate conditions. The cyclic voltammetry showed that its electrochemical properties resembled the metallic pure lead. A lead acid battery equipped with the carbon-based lead foam as positive current collector undergone a charge–discharge test. The battery had a high discharge capacity and a good cycling stability, which indicated that the carbon-based lead foam could serve as positive current collector. The three-dimensional net structure of carbon-based lead foam provides larger surface area than traditional lead alloy grids, thus enhances the specific capacity of lead acid battery. The carbon-based lead foam might be a promising substitute for lead alloy grids. 相似文献