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来源：百度知道 编辑：UC知道 时间：2024/06/30 12:12:50
The effect of thiourea, succinic acid and lead acetate on the formation and characteristics of electroless Ni–P deposits obtained from an acidic hypophosphite reduced electroless nickel bath is addressed in this paper. The rate of deposition of electroless Ni–P coating is found to be a function of concentration of these additives. Thiourea accelerates the rate of deposition up to 0.8 ppm and started to inhibit at a concentration of 1 ppm. Similarly, succinic acid increases the plating rate up to 12 g l−1 and exhibit an inhibiting effect at higher concentrations of the order of 15 g l−1. Addition of lead acetate inhibits the rate of deposition even at a concentration of 0.5 ppm and the extent of inhibition is increased when the concentration is higher than 1 ppm. Addition of these additives also caused a change in phosphorus content of the deposits; lead acetate (1 ppm) tends to increase the phosphorus content whereas thiourea (0.8 ppm) and succinic acid (12 g /L)ends to dec

硫的效果,琥珀酸酯和领先的形成及化学镀镍磷沉积特征,得出了酸性hypophosphite减少化学镀镍浴。沉积速率的化学镀镍磷涂料是发现是一个函数的浓度这些添加剂。硫沉积速率加快了,并开始抑制0.8 ppm浓度的百万分之一。同样,琥珀酸镀速度增加到12号1和展示−信用证的抑制作用在高浓度的15克l−1。醋酸铅的抑制率即使在一个集中的沉积ppm的0.5%提高抑制当浓度高于百万分之一。这些添加剂,也造成了变化的沉积物磷的含量;引导酯(百万分之一)会增加了磷的含量,而硫脲(0.8 ppm)和琥珀酸(12总帐)结束了磷的含量减少。x -射线衍射分析了化学镀镍磷涂层的模式在缺乏添加剂和在百万分之一的醋酸铅展示一个广阔的高峰集中在2θ,◦44.5无定形的涂料。
提出了一个更大的峰值扩大的趋势的非晶态结构时使用醋酸铅添加剂。相比之下,对化学镀镍磷涂料从含硫和琥珀酸reflection洗澡,除了从镍(1)飞机,一reflection镍(2)从软弱0 0)飞机也观察到的现象。x -射线衍射分析化学镀镍磷涂层的模式在400◦退火后形成核展览C催化镍和银联信讬镍Ni3P)阶段磷化(所有的病例Ni3P 231)

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