共查询到20条相似文献,搜索用时 154 毫秒
1.
镁合金的腐蚀问题已经成为制约其诸多性能发展的关键因素,提高镁合金的耐蚀性势在必行。综述了化学镀镍的基本原理,简要介绍了镁合金化学镀镍工艺的研究现状,同时概述了镁合金化学镀镍的发展趋势。 相似文献
2.
3.
4.
5.
通过研究化学镀镍工艺的络合剂、稳定剂、促进剂、pH、温度及前处理工敢对镀层性能的影响,找到了一套铜及其合金化学镀镍的合理工艺,并对镀层的性能、成份、结构、耐蚀性、硬度、耐磨性进行了分析研究及对时效处理的影响进行了试验。结果表明:该工艺可得到结合力好、含磷在12Wt%的非晶态Ni-P合金镀层。表面硬度、抗磨减摩、抗腐耐蚀等性能有了显著提高。 相似文献
7.
8.
碳纤维增强聚醚醚酮复合材料是一种耐高温、机械性能优异、自润滑性好、耐化学品腐蚀、阻燃及耐剥离性能优异的特种工程复合材料。复合材料表面金属化不仅可以改善其装饰性,还可以进一步改善复合材料的抗磨减磨性能、抗氧化性能和阻燃性能等。详细阐述了碳纤维增强聚醚醚酮复合材料表面化学镀镍的工艺过程、影响因素、原理及质量评价方法,为推广规范的化学镀镍工艺,改善化学镀镍层质量,扩大工业应用提供了借鉴。 相似文献
9.
采用无钯活化的化学镀镍前处理,对丁二酸钠及甘氨酸在化学镀镍体系中上镍量及化学镀镍液催化的诱导期的实验,研究了在制取泡沫镍过程中适用于无钯活化的化学镀镍工艺. 相似文献
10.
ZY—03型高磷化学镀镍工艺研究 总被引:2,自引:0,他引:2
采用工业级原料,研究开发了ZY-03型高磷化学镀镍工艺。试验重点考察了镀液各组分及工艺条件对镀速及镀层耐蚀性能的影响,并测试了镀液的使用寿命及镀层性能。 相似文献
11.
12.
从换热器实际问题出发,分别回顾了化学镀层强化凝结换热、阻垢、耐蚀3个方面的研究进展。在强化凝结换热方面,阐述了以Ni-P化学镀为基础的界面表面能、镀层非晶含量、温度、压力以及添加PTFE等物质对在换热界面形成滴状凝结的影响。在化学镀阻垢方面,介绍了污垢的生长过程,讨论了镀层非晶含量、实验条件、梯度镀层以及添加W、BN、Sn、Cu等元素对镀层阻垢性能的影响。在化学镀耐腐蚀研究方面,阐述了镀层磷含量、梯度镀层、表面活性剂、镀液pH值、温度以及添加Cu、PTFE等元素对镀层抗腐蚀性能的影响。并根据实际生产情况,提出对镀层强化凝结换热、阻垢和耐腐蚀3个方面特性相互间的影响关系进行研究。同时提出,为了推进镀层技术工业化发展,还应解决镀层长效性的问题。 相似文献
13.
对45钢彩色化学镀镍磷的镀液成分、工艺参数、着色方法进行了比较深入的研究,发现钼酸铵和次亚磷酸钠可以作为着色液的主要成分,并确定了化学镀Ni-P后着色的工艺方法。经多次实验确定了各组分最佳浓度范围,以及温度、搅拌速度等工艺:钼酸铵0.25~0.30 g/L,次亚磷酸钠0.80~0.90 g/L,温度85~90℃,搅拌器转速50~75 r/min。经过不同时间可得到蓝、黄、紫、天蓝或彩虹等不同颜色。 相似文献
14.
15.
16.
17.
S. SUGIHARA A. IWASAWA K. ONOSE A. TANAKA H. ARAI T. SHODAI S. OKADA H. OHTSUKA S. TOBISHIMA J. YAMAKI 《Journal of Applied Electrochemistry》1997,27(9):1111-1117
Plating fog is often observed when metallizing a latent pattern by electroless copper plating. Metallic elements in the nuclei of plating fog particles are analysed using electron probe microanalysis (EPMA). Silver and iron are invariably found in the particles. The iron is driven into the board during the liquid honing process and reduces silver ions in the photosensitive material to silver metal which causes plating fog. Plating fog also arises from reduced copper particles or generated hydrogen gas bubbles when they are trapped on the unpatterned region. Mechanical stirring accompanied by substrate oscillation is an effective method of avoiding plating fog. 相似文献
18.
Vijaya Kumar Bulasara Oruganti Chandrashekar Ramgopal Uppaluri 《Chemical Engineering Research and Design》2011,89(11):2485-2494
Mass transfer enhanced electroless plating is a relatively new concept in the field of metal–ceramic composite membrane fabrication. In this article, we present the effect of substrate surface roughness along with various mass transfer enhancement techniques such as solution stirring, membrane stirring and sonication on metal conversion, plating efficiency, thickness, and percent pore densification using electroless plating of nickel on a porous disk shaped ceramic support with a nominal pore size of 700 nm. The plating characteristics were investigated for three different roughness values, stirrer speeds (0–300 rpm) and a loading ratio (defined as membrane area per unit volume of plating solution) value of 196 cm2/L. It was evaluated that stirring as well as sonication had a profound effect on sodium hypophosphite based electroless nickel baths. This led to a reduction in average membrane pore size by 100 nm for stirring and 130 nm for sonication when compared to the base case. Surface roughness was observed to influence the metal deposition characteristics for base case without mass transfer enhancement. Sonication, irrespective of surface roughness, provided the maximum values of selective conversion, densification and membrane thickness along with acceptable values of plating efficiency. 相似文献
19.