基于三元复合络合剂的高磷Ni-P化学镀

发布时间：2018-08-13 19:54

【摘要】：针对单一络合剂难以兼顾镀液稳定性、镀速和镀层质量等多重要求,现有复合络合剂或成本过高、或工艺稳定性欠佳等问题,采用柠檬酸钠-乳酸-乙酸钠三元复合络合剂,借助增重法、扫描电子显微镜(SEM)、能谱仪(EDS)和材料耐蚀性快速检测专利技术,系统研究了络合剂及还原剂用量、镀液初始pH值及施镀温度对化学镀Ni-P施镀效果的影响,探明镀速、镀层硬度及其P质量分数、镀层腐蚀防护性能随工艺参数的变化规律。结果表明:利用基于三元复合络合剂的镀液,不仅可获得P质量分数最高为18.41%的高磷Ni-P镀层,而且工艺稳定性优异。在适宜的镀液初始pH值区间(4.0~5.5),镀层P质量分数受其它工艺参数的影响甚微,能始终稳定在11.12%~14.52%的高位。典型试样SEM分析表明:镀层表面平整、均匀,结构致密,镀层与基体结合紧密且厚度分布均匀。
[Abstract]:In view of the problems that single complexing agent is difficult to take into account the stability of plating solution, plating speed and coating quality, the existing complex complexing agent is too expensive, or the process stability is not good enough, the ternary compound complexing agent of sodium citrate and lactic acid sodium acetate is used. By means of weight-increasing method, (EDS) of scanning electron microscope (SEM) (SEM), energy spectrometer and patent technology of rapid testing of material corrosion resistance, the effects of the amount of complexing agent and reducing agent, the initial pH value of plating solution and the plating temperature on the effect of electroless Ni-P plating were systematically studied. The hardness and P content of the coating and the corrosion protection performance of the coating vary with the process parameters. The results show that the high phosphorus Ni-P coating with the highest P content of 18.41% can be obtained by using the bath based on the ternary complex complexing agent, and the process stability is excellent. In the suitable initial pH range of the plating bath (4.0 ~ 5.5), the P content of the coating has little effect on the other technological parameters and can always be stabilized at a high value of 11.12 ~ 14.52%. SEM analysis of typical samples shows that the surface of the coating is flat, uniform, compact structure, and the coating is closely bound to the substrate and the thickness distribution is uniform.
【作者单位】：广州特种承压设备检测研究院;华南理工大学机械与汽车工程学院;
【基金】：国家质检总局科技计划项目(2013QK115)
【分类号】：TG174.4

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