摘要
在化学镀液基本成分不变的情况下,考察了硫脲的质量浓度、乳酸的质量浓度、温度、pH值对沉积速率和化学镀Ni-W-P合金镀层中W的质量分数的影响。确定了最佳的工艺条件为:硫脲5×10~(-5) g/L,乳酸16 g/L,温度90℃,pH值8.8。最佳工艺条件下所得化学镀Ni-W-P合金镀层中Ni、W、P三种元素的质量分数分别为86.38%、4.08%、9.54%。最佳工艺条件下所得化学镀Ni-W-P合金镀层能提高钢铁基体的显微硬度及其在中性盐溶液中的耐蚀性。
The influences of mass concentration of thiourea, mass concentration of lactic acid, temperature and pH value on the deposition rate and mass fraction of W element in electroless Ni-W-P alloy coatings were investigated under the conditions that the basic composition of electroless plating bath remains unchanged. The optimum process conditions were determined as follows: thiourea 5×10~(-5) g/L, lactic acid 16 g/L, temperature 90 ℃, pH value 8.8. Under the optimum conditions, it was found that the mass fraction of Ni, W and P in the electroless Ni-W-P alloy coating was 86.38%, 4.08%, 9.54%, respectively, and the as-prepared electroless Ni-W-P alloy coating could improve the microhardness and corrosion resistance of steel substrate in neutral salt solution.
引文
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