- 著者
-
津留 壽昭
木村 哲二
小林 繁夫
乾 忠孝
- 出版者
- The Surface Finishing Society of Japan
- 雑誌
- 金属表面技術 (ISSN:00260614)
- 巻号頁・発行日
- vol.27, no.5, pp.230-234, 1976
- 被引用文献数
-
3
By using N, N-dimethylformamide(DMF), an aprotic polar solvent, the electrodeposition of lead from PbCl<sub>2</sub>-DMF and Pb(NO<sub>3</sub>)<sub>2</sub>-DMF solutions was studied. The deposits of lead gave rise to the welldefined dendrites, when the electrolysis was carried out in higher concentration bath and at higher current densities, while at lower current densities (-3mA/cm<sup>2</sup>), the deposits became dark-gray and smooth. The dendrites of lead were of 2D [110], 3D [110] and 2D [100] types. The deposits from PbCl<sub>2</sub>-DMF solutions were the isolated nuclei of the layer growth (hexagonal, tetragonal and trigonal deposits), when temperature was higher than 40°C. The deposits from Pb(NO<sub>3</sub>)<sub>2</sub>-DMF solutions were white powder when temperature was higher than 50°C, while at 100°C the dendrites were not observed. The X-ray analysis of the deposits of crystalline lead had well-defined diffraction patterns. By the addition of thiourea and 2-butyne-1, 4 diol to Pb(NO<sub>3</sub>)<sub>2</sub>-H<sub>3</sub>BO<sub>3</sub>-DMF baths, semi-bright and smooth lead deposits were obtained. They had fine grains in crystal structure and were found to have the strong preferred orientation of (220). The grain size of the deposit was 150-350Å. From these results the optimum condition for the electrolysis was as follows: Pb(NO<sub>3</sub>)<sub>2</sub>: 100g/<i>l</i>, H<sub>3</sub>BO<sub>3</sub>: 10g/<i>l</i>, (NH<sub>2</sub>)<sub>2</sub>CS: 4g/<i>l</i>, HOCH<sub>2</sub>C≡CCH<sub>2</sub>OH: 3g/<i>l</i>, temperature:room temperature, current density:0.5-1.0mA/cm<sup>2</sup>, plating time: 60min, current efficiency: ca 50%.