非シアン系電解脱脂浴の研究

抄録

Studies were made on the non-cyanide electrolytic degreasing baths.
Degreasing effects were investigated by spectrofluorophotometer in various baths. The optimum conditions and bath composition were as follows.
Bath composition
sodium hydroxide 1mol/l
sodium gluconate 0.3 mol/l
potassium pyrophosphate 0.1 mol/l
Operating conditions
bath temperature 50°C
cathodic current density 10amp/dm²
electrolysis time 1min
The derusting effect of the above bath was less than that of the conventional cyanide baths, but it was available in practical use.
The deposition of iron during electrolysis could be prevented by addition of 20g/l of DTPA to the bath.
A surface active agent, called “anion type 6”, was more effective than other active agents.