Nano-ZiO_2was used to prepare composite electroplating bath by addingdifferent kinds of dispersants such as PEG and MZS. The composite electroplating bath was studied bymeans of sedimentation experiments and particle-...Nano-ZiO_2was used to prepare composite electroplating bath by addingdifferent kinds of dispersants such as PEG and MZS. The composite electroplating bath was studied bymeans of sedimentation experiments and particle-size analysis. The results showed that dispersantswith simple structure and small molecular weight could not play steric role, however, the highlydispersed and stabilized nanoparticle Ni-ZrO_2 composite electroplating bath was obtained at pHvalue equaling to 3 by adding MZS which is a kind of macromolecule dispersant with plentifulbranched chains.展开更多
There are lots of residual nickel and organic compounds in the spent electroless nickel plating bath. It not only wastes resource but also causes environmental pollution if the wastewater is discharged without treatme...There are lots of residual nickel and organic compounds in the spent electroless nickel plating bath. It not only wastes resource but also causes environmental pollution if the wastewater is discharged without treatment. In this paper, electrolytic method and reduction method for treating spent electroless nickel plating bath were compared. The factors studied included reaction time, pH, temperature, effectiveness and cost. It was found that the recovery rate of nickel by reduction was 99.9% under the condition ofpH 6, 50℃ for 10 min. The purity of reclaimed nickel was 66.1%. This treatment needed about 16 g NaBH4 for a liter spent solution, which cost RMB 64 Yuan. For electrolysis method, with pH 7.6, 80℃, 0.45 A （current intensity） for 2 h, the recovery rate reached 97.3%. The purity was 88.5% for the reclaimed nickel. Moreover, it was found that through electrolysis, the value of TOC （Total Organic Carbon） decreased from 114 to 3.08 g·L^-1 with removal rate of 97.3%. The main cost of electrolysis came from electric energy. It cost about 0.09 kWh （less than RMB 0.1 Yuan） per liter wastewater. Compared with reduction, electrolysis had more advantages, so the priority of selection should be given to the electrolysis method for the treatment of spent electroless nickel plating bath.展开更多
A new type elctroless plating bath for solar control glass with large area uniform plating was presented on the basis of the relative Reynolds numbers , the temperature distribution calculation and the relative struct...A new type elctroless plating bath for solar control glass with large area uniform plating was presented on the basis of the relative Reynolds numbers , the temperature distribution calculation and the relative structure design. The experimental data of the distribution and change of temperature indicate that the mass transfer of the fluid was steady laminar flow and the difference of the maximum temperature was less than 0 5℃ in glass dipping region of 1000×200×1000mm.展开更多
文摘Nano-ZiO_2was used to prepare composite electroplating bath by addingdifferent kinds of dispersants such as PEG and MZS. The composite electroplating bath was studied bymeans of sedimentation experiments and particle-size analysis. The results showed that dispersantswith simple structure and small molecular weight could not play steric role, however, the highlydispersed and stabilized nanoparticle Ni-ZrO_2 composite electroplating bath was obtained at pHvalue equaling to 3 by adding MZS which is a kind of macromolecule dispersant with plentifulbranched chains.
基金Supported by National Natural Science Foundation of China (59870469)Homecoming Foundation of Heilongjiang Province (LC06C04)Researcher Overseas Foundation of the Department of Education of Heilongjiang Province (1152hq19)
文摘There are lots of residual nickel and organic compounds in the spent electroless nickel plating bath. It not only wastes resource but also causes environmental pollution if the wastewater is discharged without treatment. In this paper, electrolytic method and reduction method for treating spent electroless nickel plating bath were compared. The factors studied included reaction time, pH, temperature, effectiveness and cost. It was found that the recovery rate of nickel by reduction was 99.9% under the condition ofpH 6, 50℃ for 10 min. The purity of reclaimed nickel was 66.1%. This treatment needed about 16 g NaBH4 for a liter spent solution, which cost RMB 64 Yuan. For electrolysis method, with pH 7.6, 80℃, 0.45 A （current intensity） for 2 h, the recovery rate reached 97.3%. The purity was 88.5% for the reclaimed nickel. Moreover, it was found that through electrolysis, the value of TOC （Total Organic Carbon） decreased from 114 to 3.08 g·L^-1 with removal rate of 97.3%. The main cost of electrolysis came from electric energy. It cost about 0.09 kWh （less than RMB 0.1 Yuan） per liter wastewater. Compared with reduction, electrolysis had more advantages, so the priority of selection should be given to the electrolysis method for the treatment of spent electroless nickel plating bath.
文摘A new type elctroless plating bath for solar control glass with large area uniform plating was presented on the basis of the relative Reynolds numbers , the temperature distribution calculation and the relative structure design. The experimental data of the distribution and change of temperature indicate that the mass transfer of the fluid was steady laminar flow and the difference of the maximum temperature was less than 0 5℃ in glass dipping region of 1000×200×1000mm.
