Abstract
The effect of polyethylene glycol mono-p-nonylphenyl ether on heavy electrodeposition of silver from cyanide baths were studied. It was found that by adding polyethylene glycol mono-p-nonylphenyl ether to cyanide baths, the rate of growth in the direction of the normal line at the (111) and (222) planes became larger than the rate of growth in other planes, and catholic polarization became smaller.
These results suggest that polyethylene glycol mono-p-nonylphenyl ether absorbed onto the (111) and (222) planes facilitates crystal growth in the direction of the normal line at the (111) and (222) planes.
Using a bath composed of 125g/L of AgCN, 185g/L of KCN, 20g/L of KOH, 20g/L of K2CO3, and 10-30mg/L of polyethylene glicol mono-p-nonylphenyl ether.
It was possible to obtain silver deposits of a thickness of 7000μm or more at a current density of 10A/dm2.
