The binary mixture of Yb2O3-La2O3 was used as an additive to improve the traditional electroless plating for Pd-Ag co-deposition on the inside surface of a porous ceramic tube. The main attention were paid to investig...The binary mixture of Yb2O3-La2O3 was used as an additive to improve the traditional electroless plating for Pd-Ag co-deposition on the inside surface of a porous ceramic tube. The main attention were paid to investigating the effects of Yb2O3-La2O3 on Pd-Ag co-deposition rate, plating temperature, Ag content in film and Pd/Ag reduction potentials. The experimental results show that the co-deposition rate is increased by 63 % , the plating temperature is decreased by 10 ~ 20℃for obtaining the same co-deposition rate and the Ag content in film basically remains unchangeable when Yb2O3-La2O3 is added into the traditional electroless plating solution. The experiment also shows that Pd/Ag reduction potentials basically remain unchangeable with the binary rare earths based on the electrochemical mathematical models An inorganic composite membrane with alloy film of 76.8(mol)% Pd-23.2(mol) % Ag and the thickness of 7.7μm on the porous ceramic tube was prepared and the permeation fluxes of hydrogen and nitrogen through the membrane are 8.65×10-3 and 1.92×10-6m3·m-2·s-1 at 350℃and 0.3 MPa respectively.展开更多
The main purpose of this article is to use rare earths to modify the electroless plating process for metallizing the surface of quartz optical fibers (silicon fibers). The effects of Yb, Ce and La on the deposition ra...The main purpose of this article is to use rare earths to modify the electroless plating process for metallizing the surface of quartz optical fibers (silicon fibers). The effects of Yb, Ce and La on the deposition rate of Ni-P, the stability of plating solution and the surface structure of Ni-P film were investigated and their mechanisms were discussed. The surface morphonogies and compositions of the Ni-P films were characterized and analyzed by SEM, MSM, XRD and ESM, respectively. The experimental results showed that Ce(SO4)2 with concentration of 40 mg·L-1 was proved to be the best choice for increasing the deposition rate, enhancing the stability of plating solution and improving the quality of deposited Ni-P film compared with the other two kind of rare earths. The detections of ESM exhibited no effect of Ce on film compositions and no Ce deposition being found in the film prepared by electroless plating with adding Ce because of its much more negative deposition potential than those of the reducing agents used in the experiment. The addition of Ce resulted in a transmission of the film surface structure from crystal structure into a microcrystallitic structure. The Ni-P film with thickness of about 45 μm prepared using electroless plating by adding Ce(SO4)2 with concentration of 40 mg·L-1 had good quality, which will be satisfactorily for the next Ni deposition by electroplating.展开更多
基金Project supported by Science and Technology Committee of Jiangxi Province
文摘The binary mixture of Yb2O3-La2O3 was used as an additive to improve the traditional electroless plating for Pd-Ag co-deposition on the inside surface of a porous ceramic tube. The main attention were paid to investigating the effects of Yb2O3-La2O3 on Pd-Ag co-deposition rate, plating temperature, Ag content in film and Pd/Ag reduction potentials. The experimental results show that the co-deposition rate is increased by 63 % , the plating temperature is decreased by 10 ~ 20℃for obtaining the same co-deposition rate and the Ag content in film basically remains unchangeable when Yb2O3-La2O3 is added into the traditional electroless plating solution. The experiment also shows that Pd/Ag reduction potentials basically remain unchangeable with the binary rare earths based on the electrochemical mathematical models An inorganic composite membrane with alloy film of 76.8(mol)% Pd-23.2(mol) % Ag and the thickness of 7.7μm on the porous ceramic tube was prepared and the permeation fluxes of hydrogen and nitrogen through the membrane are 8.65×10-3 and 1.92×10-6m3·m-2·s-1 at 350℃and 0.3 MPa respectively.
文摘The main purpose of this article is to use rare earths to modify the electroless plating process for metallizing the surface of quartz optical fibers (silicon fibers). The effects of Yb, Ce and La on the deposition rate of Ni-P, the stability of plating solution and the surface structure of Ni-P film were investigated and their mechanisms were discussed. The surface morphonogies and compositions of the Ni-P films were characterized and analyzed by SEM, MSM, XRD and ESM, respectively. The experimental results showed that Ce(SO4)2 with concentration of 40 mg·L-1 was proved to be the best choice for increasing the deposition rate, enhancing the stability of plating solution and improving the quality of deposited Ni-P film compared with the other two kind of rare earths. The detections of ESM exhibited no effect of Ce on film compositions and no Ce deposition being found in the film prepared by electroless plating with adding Ce because of its much more negative deposition potential than those of the reducing agents used in the experiment. The addition of Ce resulted in a transmission of the film surface structure from crystal structure into a microcrystallitic structure. The Ni-P film with thickness of about 45 μm prepared using electroless plating by adding Ce(SO4)2 with concentration of 40 mg·L-1 had good quality, which will be satisfactorily for the next Ni deposition by electroplating.
