共查询到19条相似文献,搜索用时 156 毫秒
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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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锡镀层具有优良的抗腐蚀性能及可焊性,被广泛用作电子元器件的保护性和可焊接性镀层。随着电子信息技术的发展,对电镀锡镀层质量也有了更高的要求。在电镀锡过程中,镀液成分及含量是保证镀层质量的关键。随着镀液使用时间的推移,镀液中的金属离子杂质浓度会逐渐增大,当镀液中的金属离子杂质达到一定浓度后,就会对镀层质量产生较大的影响。采用旋转环盘电极研究在电镀过程中两种主要的金属离子杂质(Fe2+、Ni2+)对锡离子还原动力学的影响,进一步解释了金属离子杂质导致锡镀层质量差的原因,研究结果对电镀锡工艺开发以及过程控制具有一定的指导意义。 相似文献
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影响镍镀层内应力的因素及排除方法 总被引:8,自引:0,他引:8
镀镍层内应力对其性能影响较大简单介绍了镀层内应力的一种定性测定方法-条形阴极法,并列出了其半定量的计算公式分析了影响镀镍层内应力的几种因素:电镀光亮剂、pH值、电流密度、温度及杂质提出了相应的排除方法,并指出重视镀液的维护与管理是有效控制镀层内应力的主要方法。 相似文献
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甲基磺酸盐电镀锡铅合金工艺 总被引:11,自引:0,他引:11
1 前言 锡铅合金镀层以其优良的耐蚀性、可焊性、润滑减摩擦性能在工业上得到了广泛应用[1],特别在电子工业领域.然而,在工业上锡铅合金镀液主要有氟硼酸盐、氟硼酸盐-氨基磺酸盐、酚磺酸盐、柠檬酸盐镀液等.前三种含有氟、酚等有害物质,对操作者有很大的危害,又污染环境,三废治理困难,且处理费用很高;而柠檬酸电镀液则成分较复杂,生产难于控制,较少使用.近年来,研制了一种甲基磺酸体系电镀锡铅合金工艺,有效地解决了上述几种体系中出现的问题,而且镀层质量好,是一种很有工业化发展潜力的电镀锡铅合金工艺. 相似文献
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铝及其合金电镀光亮锡-铅合金工艺研究 总被引:1,自引:0,他引:1
研究了采用浸锌-锡合金与预镀镍相结合的方法,在铝及其合金表面形成一层中间层再电镀光亮锡-铅合金工艺。介绍了铝及其合金制件的脱脂、碱蚀、出光及预镀等预处理工艺和配方,探讨了浸锌-镍合金溶液的配制、温度及时间对镀层性能的影响。结果表明,该工艺所获得的镀层结晶细致、光亮、焊接性能高、结合力强。 相似文献
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D. Pilone 《Electrochimica acta》2006,51(18):3802-3808
A novel process is being developed for metal recovery from waste electrical and electronic equipment (WEEE) and involving a leach reactor coupled to an electrochemical reactor. Metals such as Ag, Au, Cu, Pb, Pd, Sn, etc. are dissolved from shredded WEEE in an acidic aqueous chloride electrolyte by oxidizing them with aqueous dissolved chlorine species. In the electrochemical reactor: (i) chlorine is generated at the anode for use as the oxidant in the leach reactor, and, simultaneously, (ii) at the cathode, the dissolved metals are electrodeposited from the leach solution. The Butler-Volmer equation was used to provide predictions of the electrode potential dependences of partial current densities, and hence total current densities, current efficiencies and alloy compositions, for acidic aqueous chloride electrolytes containing Ag(I), Au(III), Cu(II), Fe(III), Pb(II), Pd(IV) and Sn(IV) species, together with dissolved chlorine. With judicious choice of kinetic parameters, the predicted total current density—electrode potential behaviour of such solutions was in good agreement with experimental data for a rotating Pt disc electrode. Reduction of dissolved chlorine at a Pt rotating disc electrode exhibited mass transport controlled behaviour, in agreement with Levich's equation over the potential range 0.3-0.9 V (SHE). This could form the basis of a linear sensor, possibly using a microelectrode for measurement and control of the dissolved chlorine concentration in the efflux of leach reactors and inlet to cathodes of the electrowinning reactors, in the envisaged process. 相似文献
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Electrodeposition and heat-treatment was attempted to directly obtain a Sn-Cu alloy anode with fine grain of crystals for lithium ion batteries. The preparation of Sn-Cu alloy anode started with pulsed electrochemically depositing tin on the substrate of copper foil collector, and a protection coating layer of copper was plated on the surface of deposited Sn. An alloy of tin and copper was formed when heated. The energy dispersive spectroscope (EDS) and X-ray diffraction (XRD) analysis showed the copper and tin were partially alloyed to form Cu6Sn5 and Cu3Sn after annealing. The SEM analysis showed the uncoated electrode is cracked after a cycle and the copper coated electrode was not cracked after 50 cycles. The Cu-coated electrode presented the first cycle coulomb efficiency reaching 95% and good cycleability. 相似文献
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