以镀速和耐蚀性能作为判据，通过正交试验获得了较优的三元Ni—W-P合金镀层工艺，即镀液组成：硫酸镍30g／L，次亚磷酸钠25-30g／L，钨酸钠50g／L，柠檬酸钠75g／L，乳酸15mL／L，硫酸铵30g／L和添加剂20mg／L；pH值9．0和镀液温度（90±2）℃．电化学测试结果表明，Ni—W—P镀层的耐蚀性能优于Ni—P镀层．研究了高温热处理对Ni—w—P合金镀层耐蚀性能的影响并采用扫描电镜（SEM）和x射线衍射仪（xRD）分析镀层形貌和相组成．结果表明，高温热处理导致镀层内部及镀层与基体之间发生了元素的互扩散，并在镀层表面生成致密的氧化膜，进而提高镀层的耐蚀性能．
Orthogonal experiments were conducted to find out the optimal process for electroless plating of Ni-W-P coatings. Deposition rate and corrosion resistance were taken as the index for performance assessment. The optimal process is that a solution consisted of NiSO4.6H2O 30 g/L, Na2H2PO2.H2O 25-30 g/L, Na2WO4.2H2O 50 g/L, Na3C6H5OT-2H2O 75 g/L, lactic acid 15 mL/L, （NH4）2SO4 30 g/L and additive 20 mg/L with pH9.0 at temperature （90±2） ℃ The corrosion performance of coatings were evaluated by electrochemical tests. The results indicated that the corrosion performance of Ni-W-P coating was superior to Ni-P coating. The corrosion resistance of Ni-W-P coating may be further improved after a proper high temperature heat- treatment. According to the scanning electron microscopy images and X-ray diffraction patterns, after heat treatment there exist an interdiffusion zone between Ni-W-P coating and substrate steel, whilst a compact oxide scale also formed on the surface of the coating, which are considered to be beneficial to the enhancement for the adhesion and corrosion resistance of the coatings.
参考文献
| [1] | 王雪英,王璐.化学镀Ni-W-P合金的组织结构与耐蚀性能的研究[J].材料保护,1992,25(5):19. |
| [2] | 于祖孝,郝世雄,孙亚丽等.热处理工艺对化学镀Ni-W-Mo-P四元合金性能的影响[J].材料热处理技术,2008,37(22):52. |
| [3] | 耿冰霜,卫英慧,侯利锋等.不锈钢衬底化学镀Ni-W-P三元合金组织及性能研究[J].稀有金属材料与工程,2009,38(1):71. |
| [4] | 范洪富,闫红娟,张翼等.热处理对钛基化学镀Ni-P镀层性能的影响[J].材料热处理学报,2008,29(4):153. |
| [5] | 李雪松,王金波,杜立辉.热处理对化学镀Ni-P合金耐蚀性及晶体结构的影响[J].电镀与环保,2007,27(2):20. |
| [6] | 高岩.化学镀纳米晶Ni-M-P合金镀层的制备、微观结构和耐蚀性能[D].广州:华南理工大学,2005. |
| [7] | 胡信国.21世纪的化学镀镍技术[C].北京:中国腐蚀与防护协会,2000. |
| [8] | 宋锦福,郭凯铭.镍-钨-磷合金化学镀的研究[J].福州大学学报(自然科学版),1997,25(6):60. |
| [9] | 卢旭东,邵忠财.化学镀Ni-P合金镀层孔隙率的影响因素[J].电镀与精饰,2007,29(6):1. |
| [10] | 杨雅勇.镍镀层针孔与麻点的综合控制[J].机电元件,2002,22(2):29. |
| [11] | Keong K G, Sha W, Malinov S. Crystallization kinetics transformation behavior of electroless nickel-phosphorus deposits with high phosphorus content[J]. J. Alloys Com- pd., 2001, 334: 192. |
| [12] | Gao Y, Zheng Z J, Zhu M, et al. Corrosion resistance of electrolessly deposited Ni-P and Ni-W-P alloys with vari- ous structures[J]. Mater. Sci. Eng., 2004, 381: 98. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%