研究了4种稀土元素Nd、Pr、Ce、La的硫酸盐及其氧化物对化学镀Ni W P镀液的沉积速度和镀层耐硝酸滴定变色时间的影响。结果表明,4种稀土的硫酸盐均降低了镀液的沉积速度,并使镀层的耐蚀性能下降;Nd、Ce、La的氧化物亦使镀层的耐蚀性下... 研究了4种稀土元素Nd、Pr、Ce、La的硫酸盐及其氧化物对化学镀Ni W P镀液的沉积速度和镀层耐硝酸滴定变色时间的影响。结果表明,4种稀土的硫酸盐均降低了镀液的沉积速度,并使镀层的耐蚀性能下降;Nd、Ce、La的氧化物亦使镀层的耐蚀性下降,而当ρ(Pr2O3)为4mg/L时,镀液的稳定性为未加Pr2O3时的2倍,其沉积速度明显加快,镀层的耐硝酸滴定变色时间超过2000s,硬度明显增大,SEM图表明该镀层呈现致密而均匀的胞状形貌,表面质量优于未加稀土的镀层,X-射线衍射图也表明Pr2O3促进了镀层的非晶态化程度,从而提高其耐蚀性能。展开更多
讨论了 316L不锈钢上化学镀Ni P/Ni W P合金镀层的工艺,重点是直接影响镀层与基体间结合力的关键过程———不锈钢基体的前处理工艺。试验发现,在前处理工艺中侵蚀活化液和预镀镍液的配方是最重要的。对 2种镀层成分和结构的分析、结合...讨论了 316L不锈钢上化学镀Ni P/Ni W P合金镀层的工艺,重点是直接影响镀层与基体间结合力的关键过程———不锈钢基体的前处理工艺。试验发现,在前处理工艺中侵蚀活化液和预镀镍液的配方是最重要的。对 2种镀层成分和结构的分析、结合力及硬度的测试表明,用本方法前处理工艺对 316L不锈钢基体处理后进行化学镀能获得性能可靠的Ni P/Ni W P合金镀层。展开更多
为了在镁合金表面得到保护性镀层,研究了镁合金化学镀Ni W P的镀液组成和操作条件对镀速的影响,测定了镀层的厚度,显微硬度和结合力,利用X射线衍射(XRD)研究了镀层镀态的结构组织,镀层具有较高的硬度和优良的结合力,镀速由镀液组成的... 为了在镁合金表面得到保护性镀层,研究了镁合金化学镀Ni W P的镀液组成和操作条件对镀速的影响,测定了镀层的厚度,显微硬度和结合力,利用X射线衍射(XRD)研究了镀层镀态的结构组织,镀层具有较高的硬度和优良的结合力,镀速由镀液组成的浓度控制。展开更多
Ni-W-P coatings were deposited on the surface of glass fibers by the electroless plating process. The bath was very stable through the palladium salt test. There was no phenomenon of peeling and blistering on the surf...Ni-W-P coatings were deposited on the surface of glass fibers by the electroless plating process. The bath was very stable through the palladium salt test. There was no phenomenon of peeling and blistering on the surface of the Ni-W-P alloy glass fibers in the thermal shock test. It showed that the deposit had high impact strength and good adhesion. The morphology of the coatings was observed by scanning electron microscope （SEM）. The elements and their contents were tested and analyzed by energy dispersion spectrometer （EDS）. The tungsten content reached up to 12.1 wt.%. The effects of the concentrations of NiSO4, Na2WO4, and NaH2PO2.H20 on the conductivity of the coatings were studied. The resistivity of the Ni-W-P alloy glass fibers reached 7.39 × 10^-3 Ωcm. The alloy coatings on glass fibers were analyzed by XRD. The results indicated that the deposit had an amorphous structure and good heat stability. The suitable work temperature range was lower than 190℃. Finally, the electromagnetic parameters of the Ni-W-P alloy glass fibers were tested and analyzed primarily. The magnetic loss reached 0.04023 and the dielectric loss reached -5.80239. The plated alloy is a kind of soft magnetic material.展开更多
测量了化学镀Ni P和Ni W P过程混合电位随时间的变化,并分析其变化规律。指出Emix的正移与pH值随时间而降低有关,而且pH值的降低会加速化学镀的诱发过程。低碳钢诱发化学镀Ni W P会在混合电位 时间曲线上出现两个电位阶梯,其原因在于... 测量了化学镀Ni P和Ni W P过程混合电位随时间的变化,并分析其变化规律。指出Emix的正移与pH值随时间而降低有关,而且pH值的降低会加速化学镀的诱发过程。低碳钢诱发化学镀Ni W P会在混合电位 时间曲线上出现两个电位阶梯,其原因在于低碳钢在给定的镀液体系中稳定电位不够负,不能提供足够的能量使化学镀Ni W P快速发生,只有当表面形成达到一定覆盖度的具有催化活性的Ni原子层后,才能迅速地诱发化学镀过程;而Ni P和Ni W P的稳定电位足够负,可以使化学镀过程快速诱发,故仅有一个电位阶梯。展开更多
文摘 研究了4种稀土元素Nd、Pr、Ce、La的硫酸盐及其氧化物对化学镀Ni W P镀液的沉积速度和镀层耐硝酸滴定变色时间的影响。结果表明,4种稀土的硫酸盐均降低了镀液的沉积速度,并使镀层的耐蚀性能下降;Nd、Ce、La的氧化物亦使镀层的耐蚀性下降,而当ρ(Pr2O3)为4mg/L时,镀液的稳定性为未加Pr2O3时的2倍,其沉积速度明显加快,镀层的耐硝酸滴定变色时间超过2000s,硬度明显增大,SEM图表明该镀层呈现致密而均匀的胞状形貌,表面质量优于未加稀土的镀层,X-射线衍射图也表明Pr2O3促进了镀层的非晶态化程度,从而提高其耐蚀性能。
文摘讨论了 316L不锈钢上化学镀Ni P/Ni W P合金镀层的工艺,重点是直接影响镀层与基体间结合力的关键过程———不锈钢基体的前处理工艺。试验发现,在前处理工艺中侵蚀活化液和预镀镍液的配方是最重要的。对 2种镀层成分和结构的分析、结合力及硬度的测试表明,用本方法前处理工艺对 316L不锈钢基体处理后进行化学镀能获得性能可靠的Ni P/Ni W P合金镀层。
基金The project was financially supported by The Space Foundation of Supporting-Technology of China (No. 2002EK1803)the Graduate Starting Seed Fund of Northwestern Polytechnical University (No. W016663)
文摘Ni-W-P coatings were deposited on the surface of glass fibers by the electroless plating process. The bath was very stable through the palladium salt test. There was no phenomenon of peeling and blistering on the surface of the Ni-W-P alloy glass fibers in the thermal shock test. It showed that the deposit had high impact strength and good adhesion. The morphology of the coatings was observed by scanning electron microscope （SEM）. The elements and their contents were tested and analyzed by energy dispersion spectrometer （EDS）. The tungsten content reached up to 12.1 wt.%. The effects of the concentrations of NiSO4, Na2WO4, and NaH2PO2.H20 on the conductivity of the coatings were studied. The resistivity of the Ni-W-P alloy glass fibers reached 7.39 × 10^-3 Ωcm. The alloy coatings on glass fibers were analyzed by XRD. The results indicated that the deposit had an amorphous structure and good heat stability. The suitable work temperature range was lower than 190℃. Finally, the electromagnetic parameters of the Ni-W-P alloy glass fibers were tested and analyzed primarily. The magnetic loss reached 0.04023 and the dielectric loss reached -5.80239. The plated alloy is a kind of soft magnetic material.
文摘 测量了化学镀Ni P和Ni W P过程混合电位随时间的变化,并分析其变化规律。指出Emix的正移与pH值随时间而降低有关,而且pH值的降低会加速化学镀的诱发过程。低碳钢诱发化学镀Ni W P会在混合电位 时间曲线上出现两个电位阶梯,其原因在于低碳钢在给定的镀液体系中稳定电位不够负,不能提供足够的能量使化学镀Ni W P快速发生,只有当表面形成达到一定覆盖度的具有催化活性的Ni原子层后,才能迅速地诱发化学镀过程;而Ni P和Ni W P的稳定电位足够负,可以使化学镀过程快速诱发,故仅有一个电位阶梯。
