摘要：化学镀镍磷合金在碱、盐、海水及有机酸等介质中比较稳定，具有较好的耐蚀性，而且随着磷含量的增加，镀层的耐蚀性提高。本论文主要对碱性高磷化学镀镍磷合金的沉积做了研究，确定了以751水合硫酸镍为主盐，次亚磷酸钠为还原剂，用柠檬酸三钠作为络合剂，镀液以氯化铵-氨水体系作为缓冲液，并且优化了在镍磷合金沉积过程中的投料比、温度和pH，确定了较佳的工艺条件。由实验最终确定反应在50℃，pH为7.2的条件下进行，原材料选择751水合硫酸镍30g/L、次亚磷酸钠（含一水）50g/L、柠檬酸三钠15g/L、氯化铵35g/L，并以氨水作为pH调节剂。产物用电镜扫描仪进行了表征。最终得到的镀层中P含量为11.68%，镍含量为88.32%。6072
关键词：化学镀；次亚磷酸钠；电镜扫描
The Research of Electroless Ni-P Alloys Coatings in Alkaline Solutions
Abstract：Electroless Ni–P alloys is relatively stable in alkali, salt, water and organic acid medium,it performs better in corrosion resistance,and with the increase of phosphorus content, the corrosion resistance of the coating is improved. This paper mainly studies the deposition of high phosphorus Electroless nickel-phosphorus alloy in the condition of alkaline,determines the main salt is nickel sulfate six hydration,the reducing agent is sodium hypophosphite,with trisodium citrate as complexing agent,uses ammonium chloride and ammonia system as buffer solution ,also optimizes the ratio of the material、temperature 、pH and confirm a better technology conditions in the study of Electroless Ni–P alloys.Reaction at 50℃ and pH for 7.2 was determined by the experiment,the content of nickel sulfate six hydration is 30g/L,the sodium hypophosphite is 50g/L,the trisodium citrate is 15g/L,the ammonium chloride is 35g/L,and the ammonia is used for pH regulator.the product was characterized by scanning electron microscope.The content of P is 11.68% and the nickel content is 88.32% in the final coating.
Keywords：electroless; sodium hypophosphite; scanning electron microscope
目录
1 引言 1
1.1 前言 1
1.2 文献综述 2
1.3 本课题研究的方向和内容 2
2 实验部分 4
2.1 实验试剂和仪器和工艺流程 4
2.1.1 实验试剂 4
2.1.2 实验仪器 4
2.1.3 基体材料 4
2.1.4 碱性高磷化学镀镍磷合金的工艺流程 4
2.2 碱性化学镀液配方及溶液中各组分作用 4
2.2.1 碱性高磷化学镀镍磷合金的工艺配方 4
2.2.2 碱性高磷化学镀镍磷合金溶液中各组分作用 5
2.3实验方案确定 7
2.3.1 基体材料的除油和抛光 7
2.3.2 配制镀液 7
2.3.3 镀层的初次制备 7
2.4 各镀液成分和实验条件的选择 8
2.4.1 化学镀温度的选择 8
2.4.2 pH的选择 8
2.4.3 硫酸镍（含751水）的选择 9
2.4.4 次亚磷酸钠（含一水）的选择 9
2.4.5 柠檬酸三钠的选择 9
2.4.6 氯化铵的选择 10
3 镀液及镀层的性能测试 11
3.1 镀层沉积速率的测试 11
3.1.1 温度改变对镀速的影响 11
3.1.2 751水合硫酸镍浓度改变对镀速的影响 12
3.1.3 次亚磷酸钠（含一水）浓度改变对镀速的影响 12 碱性高磷化学镀镍磷合金工艺研究:http://www.751com.cn/huaxue/lunwen_3417.html