钢铁表面化学镀Ni-P沉积速率的研究
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