Acid Potassium Chloride Zinc Electroplating Brightener
Electroplating is in the electrolyte containing some metal ions, will be plated workpiece as the cathode, through a certain waveform of low-voltage direct current, so that metal ions get electrons, constantly deposited in the cathode for metal processing process. So as to prevent corrosion, improve wear resistance, electrical conductivity, reflective and improve the appearance of the role.
Description
The impurity of lead in plating solution mainly comes from zinc anode and zinc chloride. Lead impurities can cause fog in the high current area, black or light black in the low current area, high content of the outcrop layer, when the lead content is more than 5mg/L, passivation film luster becomes worse, when the lead content is more than 10mg/L, the plating bath coverage ability is reduced, serious no coating. Removal method is the same as copper impurity.
The influence of hexavalent chromium
Hexavalent chromium is an oxidant, which has a great effect on potassium chloride galvanized solution, especially in the area of low current density. The chromium trivalent has little effect on potassium chloride galvanized solution, but too much chromium trivalent can also lead to pitting of galvanized layer. General trivalent chromium ion content should be less than 0.1g/L, and hexavalent chromium ion content generally do not exceed 3ppm.
Bath formula and technological parameters
|
|
concentration range |
Standard concentration |
|
KCl |
200-230 g/L |
220g/L |
|
ZnCl |
60-100 g/L |
60g/L (barrel) |
|
Boric Acid |
30-40 g/L |
35 g/L |
|
HL-93 Softening Agent |
20-30 g/L |
25 g/L |
|
HL-93 Brightening Agent |
0.6 ml/L- 1.0 ml/L |
0.8ml/L |
|
Temperature (℃) |
10-55℃ |
40℃ |
|
PH value |
4.8-5.6 |
5.2 |
|
DK (A/dm2) |
0.1-5 |
3 |
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