摘要：阐述了以次磷酸钠为还原剂的酸性化学镀Ni-P合金镀液中各组份及操作条件等因素对其在钢铁表面上镍-磷合金沉积时的速率的影响。采用单因素试验的方法，通过控制变量的方法，分别研究了化学镀Ni-P合金镀液中主盐、还原剂、络合剂、缓冲剂、稳定剂、光亮剂等组份及工艺条件（温度、pH）等因素对其在钢铁表面上的镍沉积时的沉积速率影响，得到最佳工艺的组成为：751水合硫酸镍30g/L；一水次磷酸钠35g/L；乳酸12g/L；;丙二酸8g/L；乙酸钠16g/L；硫脲2.5mg/L；乙酸铅1mg/L；pH值3.8～4.0；温度85℃。该工艺的镀速达到了19.82μm/h。并能获二级光亮度的镀层外观，镀层的附着强度良好。29738
毕业论文关键词：化学镀；镍-磷合金；沉积速度；称重法
Study on chemical plating deposition rate of Ni-P on the steel surface
Abstract ：It expounds that the sodium phosphate as the reducing agent as a condition of acidic electroless Ni - P alloy plating solution components and operating conditions on the nickel phosphorus alloy deposits on steel surface rate. Adopting the method of single factor experiment, through the control variable, the method of electroless Ni - P alloy plating solution was studied in the primary salt, reducing agent, coordination agent, buffer and stabilizer, brightener and other components and process conditions (temperature, pH), and other factors on the nickel deposition on steel surface deposition rate influence, thereby gaining a relatively fast deposition rate of electroless plating nickel process, and in this process took the bright nickel phosphorus alloy plating coating. The deposition rate is determined by weighing method. The gloss level of coating is determined by visual method. Bending test for determining the coating adhesion strength is qualified. The best formula was showed: hexahyd rate nickel sulfate 30 g/L; Monohydrate sodium hypophosphite 35 g/L; lactic acid12 g/L; malonic acid 8 g/L; sodium acetate 16 g/L; sulfocarbamide 2.5 mL; Lead acetate 1 ml; pH 3.8 to 4.0; temperature of 85 ℃. It's plating velocity to 19.82μm/h and the appearance of secondary sexual light good adhesion strength of coating.
Keywords:Chemical plating; Nickel phosphorus alloy; deposition rate; Weight method.
目录
1 引言    1
1．1课题的概况及研究意义    1
1．2课题研究的内容及目的    1
1．3化学镀Ni-P技术国内外概况及发展趋势    1
1．3．1化学镀Ni-P技术国内外概况    1
1．3．2化学镀Ni-P层的前景展望    4
1．4课题要解决的主要问题    5
2化学镀镍磷的技术原理    6
2．1以次磷酸钠为还原剂的镍磷共沉积机理    6
2．2 还原剂脱氢机理    8
3．工艺研究方法    9
3．1工艺研究方法    9
3．2各项性能测定、试验方法    9
3．2．1 镀层的沉积速度    9
3．2．2镀层性能测    9
4.实验研究    11
4．1实验仪器、试剂、材料    11
4．1．1 主要实验仪器    11
4．1．2 材料和化学试剂    11
4．2镀层（或转化膜）制备    11
4．2．1溶液的配制    11
4．2．2添加剂的配制    11
4．2．3化学镀    12
5．试验结果及讨论    14
5．1工艺成份的作用与影响    14
5．1．1基础成份    14
5．1．2添加剂    17
5．2工艺条件的影响    19
5．2．1 pH值    19
5．2．2温度    20 钢铁表面化学镀Ni-P沉积速率的研究:http://www.751com.cn/huaxue/lunwen_25100.html