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分别介绍了锌镍合金无氰碱性电镀工艺流程、工艺配方、钝化工艺和钝化膜老化处理工艺。研究了镀液的分散能力。分析了锌镍合金镀层特点。4年的应用实践证明,锌镍合金镀层对海洋大气环境中紧固件的防护效果明显。 相似文献
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介绍了天线安装支架(Q235-A材质)无氰碱性电镀锌镍合金主要工序(包括超声波除油、阴极电解、阳极电解、活化、预镀锌、退镀锌、电镀锌镍合金、化学出光和钝化)的溶液组成和工艺条件,指出了镀液和钝化液日常维护的注意事项。彩色或黑色钝化后的锌镍合金镀层在中性盐雾试验中的耐红锈时间超过1 000 h,耐蚀性满足应用要求。 相似文献
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高耐蚀Zn-Ni合金电镀工艺 总被引:1,自引:0,他引:1
介绍一种高耐蚀性Zn-Ni合金镀液配方及电镀工艺流程,阐述了Zn-Ni合金镀液成分及工艺条件的影响及维护方法。对Zn-Ni合金镀层进行钝化处理后,通过中性盐雾试验,并与镀锌层进行比较,Zn-Ni合金镀层的耐蚀性高于镀锌层4~8倍。该配方具有成本低、工艺简单、分散性好、操作方便及镀层易钝化等优点。 相似文献
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介绍了一种新型的RG-281碱性锌-镍合金工艺,并对镀液成分及操作条件进行了研究,确定了最佳的工艺条件为:氧化锌8~12g/L,氢氧化钠100~140g/L,RG-281配位剂80~100mL/L,RG-281镍补加剂8~12mL/L,RG-281光亮剂1~3mL/L,20~30℃,1~5A/dm2。对镀液性能和镀层性能进行了测试。锌-镍合金镀层的耐蚀性远大于纯锌镀层的。 相似文献
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由于六价铬的高毒性,镀锌层三价铬钝化工艺是一种替代六价铬钝化工艺的良好选择.其中三价铬蓝白钝化是一种优良的防护-装饰性膜层.详细阐述了影响蓝白色钝化膜性能的主要因素.经过不断的试验,研究出了一种组分简洁的镀锌层三价铬蓝白色钝化液,性能稳定,外观和耐蚀性优良. 相似文献
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A new wet process for selective copper deposition on silicon surfaces is employed to achieve conformal metallization of silicon micromechanical devices. The method is based on galvanic displacement of the metal from a fluoride-containing bath. The plating bath also comprises a complexing agent, a surfactant and an anti-stress additive. Surface passivation of the displaced Cu film is effected by dodecanethiol self assembled monolayer coating. This surface passivation is found effective in reducing adhesion of micro-electromechanical systems. 相似文献
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以过渡金属硫化物M替代钴(镍)盐作发黑剂,在镀锌层表面得到黑色钝化膜。钝化液的配方与工艺为:Cr2(SO4)335g/L,有机羧酸X6g/L,柠檬酸32g/L,过渡金属硫化物M2g/L,FeSO410g/L,NaNO37g/L,NaH2PO415g/L,pH=2.0,室温,时间30s。钝化膜层乌黑均匀、附着力合格;经封闭后的三价铬黑色钝化膜,其耐蚀性等级高于市售含钴盐发黑剂的三价铬黑色钝化膜,且达到六价铬钝化的耐蚀等级;钝化膜中不含六价铬;钝化液性能稳定。 相似文献
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连续电镀锌镍合金的研究 总被引:4,自引:0,他引:4
提出了一种高氯化铵弱酸型镀液体系连续电镀锌镍合金工艺,研究了m(Ni^2 )/[m(Ni^2 ) m(Zn^2 )]、氯化铵浓度,电流密度、温度、PH值对镀层镍含量的影响,推导出连续镀的镀速计算公式,采用此工艺可获得外观良好、镍含量在13%-15%的锌镍合金镀层。 相似文献
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L. Fedrizzi L. Ciaghi P. L. Bonora R. Fratesi G. Roventi 《Journal of Applied Electrochemistry》1992,22(3):247-254
Zinc and zinc-nickel (13% Ni) electrodeposits were passivated by dipping in chromate baths and characterized by scanning electron microscopy. The corrosion behaviour was studied using a.c. electrochemical techniques; electrochemical impedance spectroscopy (EIS) measurements were performed at open circuit and under galvanostatic control during the 24 h immersion time. In sodium chloride solution the zinc-nickel electrodeposits show a better corrosion resistance compared to the pure zinc coatings. During the immersion time, a surface nickel enrichment was observed which, together with the zinc corrosion products, acts as a barrier layer reducing the total corrosion rate. In the same solution the passivation treatment improves the corrosion resistance of the electrodeposits; nevertheless, on zinc substrates, the protection exerted by the chromate film is not, always effective during the immersion time. On the contrary the chromate coating on zinc-nickel substrates induces a remarkable and durable improvement of the corrosion resistance reducing the zinc dissolution almost completely. In the ammonium sulphate solution, the corrosion mechanism is significantly influenced by hydrogen reduction on the zinc-nickel surfaces, and by the production of a local surface acidity which is aggressive for the chromate coatings. 相似文献