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AVERAGE CATHODE CURRENT
EFFICIENCIES OF COMMON PLATING SOLUTIONS
NOTE: Some of these figures are very approximate. Cathode efficiency
depends very much on the plating conditions actually used. However, the
figures below serve as a starting point for estimating metal yields from
tables of plating times or electrochemical equivalents which are based
on cathode efficiencies of 100%.
| METAL |
Type of Bath |
Usual
Cathode Efficiency
Percent |
| Cadmium |
Cyanide |
88 - 95 |
| Chromium |
Chromic acid-Sulfate |
12 - 16 |
| Copper |
Acid Sulfate |
97 - 100 |
| Copper |
Cyanide |
30 - 95 |
| Copper |
Rochelle-Cyanide |
40 - 70 |
| Cobalt |
Acid Sulfate |
95 - 98 |
| Gold |
Cyanide |
70 - 90 |
| Indium |
Cyanide |
30 - 50 |
| Iridium |
Fluoborate |
30 - 50 |
| Indium |
Acid Sulfate |
70 - 80 |
| Iron |
Acid Chloride |
90 - 98 |
| Iron |
Acid Sulfate |
95 - 98 |
| Lead |
Fluoborate |
100 |
| Lead |
Fluosilicate |
100 |
| Nickel |
Acid Sulfate |
94 - 98 |
| Silver |
Cyanide |
100 |
| Tin |
Acid Sulfate |
90 - 95 |
| Tin |
Stannate |
70 - 90 |
| Rhodium |
Acid Phosphate |
10 - 18 |
| Rhodium |
Acid Sulfate |
10 - 18 |
| Zinc |
Acid Sulfate |
99 |
| Zinc |
Cyanide |
85 - 90 |
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