共查询到18条相似文献,搜索用时 140 毫秒
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研究了一种非自动化控制化学镀镍连续生产工艺。介绍了化学镀镍工艺流程及镀液配方,着重探讨了化学镀镍过程中镍液成分的消耗、分析及补充,介绍了镀槽的阳极保护设计及镀液的维护,确定了化学镀镍连续生产工艺。该工艺所得镀层光滑、致密、耐蚀性好,槽壁无金属镍析出。 相似文献
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为了顺应RoHS、ELV指令的要求,开发了无铅/镉化学镀镍工艺。从镀层合金成分、中性盐雾实验、硬度、耐磨性、整平性、内应力、微观形貌、镀速、镀液稳定性和含磷量等方面与中磷化学镀镍工艺进行了比较。结果表明,无铅/镉化学镀镍工艺镀液更稳定,所得的镍镀层内应力稍高;硬度、耐蚀性、可焊性、附着力等性能相当;而耐磨性、耐污性、沉积速度和含磷量均高于中磷化学镀镍工艺,尤其是镀层亮度、微观结构和整平效应表现更优。 相似文献
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压铸铝合金散热器内腔化学镀镍技术 总被引:2,自引:0,他引:2
针对家用压铸铝合金散热器的特点,选用化学镀镍技术对其内腔进行处理。、介绍了该处理技术的工艺流程及工艺规范。讨论了前处理工艺、施镀方式和后处理工艺对镀层性能的影响。测定了镀层的结合力及耐蚀性结果表明,利用自制的特殊夹具并采用槽外保温施镀的方法,对压铸铝合金散热器内腔采用2次浸镍舍佥及预镀碱性化学镀镍工艺之后再进行酸性化学镀镍,可提高其耐蚀性及导热性,并可实现批量生产及自动化生产。 相似文献
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电路板化学镀镍液EN-600的研制 总被引:1,自引:0,他引:1
文章介绍一种用于电路板化学镀镍/沉金工艺的化学镀镍液EN-600。这种处理液采用独特的稳定体系,使镀液性能在寿命周期内保持稳定一致,同时能形成致密的镍磷合金层,增强镀层的耐蚀性,减少镍表面的过腐蚀,提高化学镀镍/沉金处理的良晶率。 相似文献
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化学镀镍铜磷三元合金沉积工艺的研究 总被引:7,自引:1,他引:7
为提高化学镀镍的硬度、耐磨及耐蚀性,以拓宽在电子工业中应用,采用在化学镀镍磷合金液中添加适量的铜离子制得镍铜磷三元合金。研究了镍离子与铜离子浓度比、次磷酸钠含量、沉积温度对合金镀层沉积速率的影响,利用S-570扫描电镜和H-800透电镀观察了镀层表面形貌和显微组织,通过硝酸腐蚀试验比较了镍磷合金与镍铜镀层的耐蚀性。结果表明,铜的共沉积能明显提高镍磷合金的耐蚀性。 相似文献
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化学镀镍-铜-磷三元合金工艺的研究 总被引:1,自引:2,他引:1
为提高化学镀镍-磷合金镀层的性能及获得多种性能的合金镀层以拓宽其应用范围。在化学镀镍-磷合金液中加入硫酸铜制得镍-铜-磷三元合金。研究了镀液中硫酸镍、次磷酸钠、柠檬酸钠、硫酸铜、稳定剂、光亮剂的含量以及pH值和温度等因素对合金镀层的外观、沉积速度及铜含量的影响。通过5%氯化钠溶液和10%硫酸溶液浸泡试验比较了所得镍-铜-磷合金镀层与镍-磷合金镀层以及前人制得的镍-磷合金镀层的耐蚀性,同时比较了上述镀层的其它性能。结果表明,所得镍-铜-磷合金镀层的耐蚀性、外观、结合力、孔隙率、沉积速度、硬度和耐磨性等性能优于镍-磷合金及前人制得的镍-铜-磷合金镀层。 相似文献
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Wenfeng Qin 《Journal of Coatings Technology and Research》2011,8(1):135-139
The microstructure and corrosion behavior of electroless Ni–P alloy plating on 6061 aluminum alloys substrate in an alkaline
plating bath with sodium hypophosphite as reducing agent were investigated. The effects of bath temperature on the plating
rate, compositions, and microstructure of the electroless Ni–P deposits were studied. The results showed that the deposition
rate and the P content of the electroless Ni–P deposits increased with the rise of the bath temperature. Scanning electron
microscopy (SEM) of the deposits showed nodular structure for binary deposits. X-ray diffraction patterns of all the deposits
revealed a single and broad peak which indicated the amorphous structure of the deposits. Corrosion resistance of the Ni–P
coatings was evaluated by potentiodynamic polarization. The results indicated that electroless Ni–P plating could obviously
improve the corrosion resistance of 6061 aluminum alloy. 相似文献
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M. Bouanani F. Cherkaoui R. Fratesi G. Roventi G. Barucca 《Journal of Applied Electrochemistry》1999,29(5):637-645
Electroless Ni–Zn–P alloy coatings were obtained on an iron substrate from a sulfate bath at various pH values. The effects of changes in bath pH on alloy composition, morphology, microstructure and corrosion resistance were studied. Scanning electron microscopy was performed to observe the morphological change of the deposits with bath pH. Coating crystallinity was investigated by grazing incidence asymmetric Bragg X-ray diffraction and transmission electron microscopy. A transition from an amorphous to polycrystalline structure was observed on increasing the bath alkalinity, and thus decreasing the phosphorus content of the alloys. A single crystalline phase corresponding to face-centred-cubic nickel was identified in the alloys obtained from a strong alkaline solution. An increase in zinc percentage up to 23% in the deposits does not change the f.c.c. nickel crystalline structure. Corrosion potential and polarization resistance measurements indicated that the corrosion resistance of electroless Ni–Zn–P alloys depends strongly on the microstructure and chemical composition. The deposits obtained at pH 9.0–9.5 and with 11.4–12.5% zinc and 11.8–11.2% phosphorous exhibited the best corrosion resistance. 相似文献
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活化时间对镁合金化学镀镍层性能的影响 总被引:1,自引:0,他引:1
测试了活化时间对镁合金化学镀镍层的沉积速率、表面形貌、显微硬度及耐蚀性的影响。结果表明:当活化时间由1min增加到15min时,镀层的沉积速率变化不大;当活化时间为5min时,镀层表面的胞状物细小且分布均匀,微观缺陷数量较少,此时镀层的显微硬度最高、耐蚀性最好。 相似文献