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摘要：化学镀镍磷合金是利用自催化还原反应进行的表面处理工艺，历经半个多世纪的研究开发，现已广泛应用于多个工业的领域。本实验的研究内容为化学镀镍液的周期变化，在大量文献的基础上，不仅了解了化学镀镍工艺的研究现状，而且比较了中温到高温的化学镀镍的周期变化，发现对柠檬酸做络合剂的酸性化学镀镍工艺进行研究是非常有理论意义的。本文通过改变化学镀镍液发生沉积时的温度，从而引起周期的改变，来确定在哪一个温度下的化学镀镍液的使用寿命最持久。而通过实验分析得出在70℃的时候的化学镀镍液的周期最长，即寿命最持久。对于剩余镍离子的测定以及补充加入，本文采用连续补加的方法，每次在镀完七片样片之后使用EDTA标准溶液滴定。通过分析实验的方法求得镀液中剩余镍离子的含量，来确定需要补加的751水合硫酸镍(NiSO4•6H2O)的质量。当溶液不再产生气泡发生沉积，镀液的寿命便达到了极限，即镀液报废。此时需将补加的751水合硫酸镍(NiSO4•6H2O)的质量全部相加之后除以溶液中它的初始质量，得到周期。22447
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毕业论文关键字：周期；柠檬酸；温度变化；沉积
Research of the life cycle of acidic electroless nickel plating solution by using citrate acid as complexing agents
Abstract：Electroless nickel-phosphorus alloy is the use of self-catalytic reduction reaction of the surface treatment process, after half a century of research and development, which is now widely used in several industrial fields. A content of this experiment is electroless nickel plating solution cycle. On the basis of a large number of literature, not only to understand the research situation of electroless nickel plating process , but also to compare the medium temperature to high temperature of electroless nickel plating in the cycle of change. And found that citric acid as complexing agents of acid electroless nickel plating process was studied is very theoretical significance. In this paper, by changing the temperature of the electroless nickel plating solution deposition occurs, leading to a cycle of change, to determine in which temperatures lasting the life of electroless nickel plating solution. Through the experimental analysis that at 70 ℃ the electroless nickel plating solution is the longest period that the life of the most enduring. For the rest of the determination and supplement to join of nickel ions, this article adopts the method of continuous adding, every time after the completion of the seven samples using a standard solution of EDTA titration. By analyzing the method of experiment for remaining nickel ion content in the plating solution to determine the need for additional NiSO4•6H2O. No bubbles occur when the solution deposition, the service life of plating solution has reached its limit, namely plating solution was scrapped. At this point the additional mass of the whole NiSO4•6H2O pided by the initial quality of the solution, obtained cycle.
Keywords：cycle; citrate; temperature change; deposition
目 录
1 绪论 1
1.1 概述 1
1.2 化学镀 1
1.2.1 化学镀原理 1
1.3 化学镀镍磷 2
1.3.1 化学镀镍磷反应机理 2
1.3.2 化学镀镍磷合金工艺 2
1.4 化学镀液 3
1.4.1 酸性化学镀镍液的配方 3
1.4.2 酸性化学镀镍的镀液的组成 4
1.5 化学镀的发展趋势与研究现状 5
1.5.1 化学镀镍的发展简史 5
1.5.2 化学镀的优点 6
1.5.3 化学镀的特点 7
1.5.4 国内外研究现状 7
1.5.4国内外发展趋势 8