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| 摘要: |
| 确定了化学镀获得不同结构Ni—Mo-P镀层的最佳工艺参数及镀液配方，探讨了络合剂、pH值、钼酸根浓度以及添加剂等参数对化学镀Ni—Mo—P合金镀层成分及结构的影响。结果表明，以柠檬酸钠作为主络合剂、醋酸钠作为辅助络合剂的络合剂体系对Ni、Mo实现共沉积有着较好的作用；Ni—Mo-P合金镀层中Mo和P含量有一定的制约关系，随着镀层中Mo含量的提高，镀层结构由非晶态向晶态转变；镀液pH值在一定范围内(pH值6．5～10)时，pH值的升高可提高沉积速度；镀液的钼酸根浓度和pH值对沉积速度的影响呈波浪形，存在一个极大值；随着沉积速度的提高，镀层的耐蚀性能也会有所改善。 |
| 关键词: 化学镀Ni–Mo–P合金镀层 镀层结构 工艺参数 |
| DOI： |
| 分类号: |
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| The Effect of pH Value and MoO42- Concentration on the Plating Rate and Structure of Electroless Ni-Mo-P alloys |
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LU Zhong-ming, GAO Yan, ZHENG Zhi-jun
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| Abstract: |
| The optimized plating bath formula and plating parameters for the electroless Ni–Mo–P alloy deposits with different structures were determined in this paper. The effect of plating parameters, such as complex agents, pH value, MoO42- concentration and additives, on the composition and structure of the Ni–Mo–P alloy deposits was investigated. The experimental results showed that among the complex agents used, only one made from sodium citrate tribasic dihydrate (C6H5Na3O7·2H2O) and sodium acetate trihydrate (CH3COONa·3H2O) was found to be helpful to the co-deposition of Ni and Mo to get good Ni-Mo-P alloy deposits. In the Ni–Mo–P alloy deposits there was a close relation between the Mo and P contents, and the structure changed from amorphous to crystalline with the increase of the Mo content in the deposits. Within a certain range of pH value (pH 6.5~10), the plating rate increased with the pH value going up. The effect of MoO42- concentration and pH value on the plating rate was found to present a waved form, having a maximum value. With the increase of plating rate, the corrosion resistance of the alloy deposits became better. |
| Key words: electroless Ni–Mo–P plating deposit structure plating parameters |
