MX-Zn-D-31C Zinc plating trivalent chromium
iridescent passivation
Feature:
1. It is a very cost-effective product. It belongs to environmental protection series, high
corrosion resistant passivation, up to RoHS request,no hexavalent involved;
2. Easy to operate, brightly
and evenly colored;
3. Great corrosion resistance,
8μm zinc plating could reach more than 96 hours in NSS(neutral salt spray ) test;
4. Applicable to all
post-processing of zinc plating;
Process and operation
condition
|
|
Scope
|
Recommended value
|
|
MX-Zn-D-31C
|
70—90ml/L
|
80ml/L
|
|
PH value
|
1.8—2.2
|
2.0
|
|
Temperature
|
18—35℃
|
25℃
|
|
Time
|
15—45seconds
|
25seconds
|
|
Mixing
|
Air mixing
|
Air mixing
|
Passivation replenishment
Mix MX-Zn-D-31C with 68% nitric acid in the proportion of 6-8：1（standard 7：1）, then use it to adjust pH
value, suitable for automatic adding apparatus to replenish;
MX-Zn-D-31C replenishment
is in proportion to the treatment
area;
Add 1LMX-Zn-D-32C every time deal with 3000dm2zinc plating pieces,
there is a discrepancy according to
product requirement and input;
As for barrel plating, input is large, increase MX-Zn-D-31C
replenishment properly to keep passivation concentrate;
