硫酸亜鉛溶液中における鉛陽極の腐蝕 (第3報)

電解液温度の影響

抄録

In previous reports, we have been studied the effects of current densities and the compositions of electrolytes on the corrosion of pure and silver-containing lead anodes in electrolytic zinc deposition. From these results, it was found that the corrosion of lead anode was considerably decreased by the addition of silver up to about 0.51%, above this the corrosion of anode became practically negligible. In present studies, therefore, testing anodes of pure lead and 0.20, 0.51, 1.03, and 2.49% silver-containing lead were used. The results were as follows:
1) The anode potential is decreased with the rise of temperature from 20 to 50°C, with the rate of 3.2mV/°C.
2) The amount of anode slime is not materially affected by varying the temperature.
3) Distribution of lead in cathode zinc at each temperature is almost uniform when the silver content of lead anode exceeds 0.51%, but below this silver content the maximum lead content is found in upper part of cathode at lower temperature and in lower part at higher temperature.
4) When the silver content of lead anode is below 0.51%, the mean lead content of zinc deposit shows minimum at temperature 35°C, above this silver content the lead content of cathode slightly increased with rise in temperature.