Supply trivalent chromium color zinc passivato

Ty-218 trivalent chromium color zinc passivator
1、 Characteristics
1
Ty-218 is an environment-friendly trivalent chromium passivator suitable for zinc coating
The passivation film is bright and gorgeous, meeting the needs of trivalent chromium products

2
Ty-218 operates at normal temperature, saving power and reducing cost
3
It has strong rust resistance and high temperature resistance, avoids the defect that the corrosion resistance of hexavalent chromium passivation film decreases after heating, and still has good corrosion resistance after secondary processing
4
Ty-218 is single agent operation in the production process and easy to control
It is suitable for hanging plating and barrel plating

5
The passivation film obtained by ty-218 has strong Fushi ability and can be tested by salt spray for more than 100 hours without any change

2、 Operation process

	range	standard
TY-218	80-120ml/L	100ml/L
temperature	normal temperature	25-40℃
PH	1．8-2．5
passivation time	35-65 seconds	55 seconds
mixing	air or mechanical stirring
filtering / span

  3、 Jianyu
1
Choose a clean tank, after cleaning and ensuring that there are no other harmful substances, add 50% pure water of the water level you need to prepare

2
After calculation, ty-218 can be added
When adding ty-218, it must be stirred until it is completely mixed evenly
After dosing, water can be added to the operating liquid level, and the temperature can be adjusted to the bath building range
After stirring for half an hour or evenly, use a standard pH meter or effective pH test paper to measure the pH of the bath liquid to the bath building range
If it is low, slowly add 25% sodium hydroxide solution for adjustment
If high, adjust with 25% dilute XiaoSuan
Adjust pH and mix evenly

3
After the tank liquid meets the operating conditions, it will be stirred for half an hour to ensure that the pH value is within the range of bath building again, and then the trial passivation can be carried out in the form of manual operation

4
The newly slotted pH value is slightly higher, and 2
8 is appropriate

4、 Operating conditions and tank liquid maintenance
1
The thickness of zinc coating required for passivation shall be more than 8 microns to ensure proper passivation film

2
In the process of operation, the pollution of hexavalent chromium should be avoided
The tank body using hexavalent chromium cannot be used for passivation operation here
Pure water must be used in production
The XiaoSuan light outlet groove should be replaced from time to time to prevent pollution and ensure the environmental protection quality and corrosion resistance of the passive film

3
In the production process, the workpiece falling into the tank should be taken out immediately
Because the passivation is an acidic liquid, it will continue to react with the falling workpiece, resulting in the increase of iron ion concentration in the tank liquid and reducing the service time and corrosion resistance of the tank liquid

4
The pH of continuous production tank liquid will gradually rise with the passivation time
When the pH rises to Chao over the operating range, the workpiece will be defective, and the pH changes rapidly, which is sensitive to the impact of passivation film
At this time, ty-218 and XiaoSuan should be added in time

5
During passivation, in addition to the rise of pH and the decline of XiaoSuan, it should also be noted that the pollution of zinc and iron is also rising

6
During normal operation, although the passivated workpieces are normal, the pH value of the bath solution should be maintained stable
The zinc concentration in the bath solution should be measured once a day
The zinc in the normal process range should not Chao exceed 8-10g / L
if it reaches more than 8g / L, 1 / 5 of the bath solution must be discharged and replenished

7
If the tank liquid is not used temporarily, it shall be covered to avoid pollution

8
The accurate consumption of ty-218 mainly depends on the output
The addition amount of passivated workpiece per square meter is roughly as follows:
15-40 ml ty-218 depends on the amount taken out
If it is a solution in a large tank, we recommend adding equipment

5、 Treatment methods of adverse phenomena

undesirable phenomena	reason	processing
the color of the workpiece is light after passivation (no color, golden)	1 The temperature is low 2 High pH value 3 Short passivation time 4 Stir too slowly	1 Correct the temperature and adjust the bath temperature 2 Correct acidity and adjust pH value 3 Appropriately extend the passivation time 4 Increase mixing
the workpiece is not clear and foggy after passivation	1 PH value is over offset 2 The zinc content in the bath is too high 3 The tank liquid temperature is too high	1 Adjust pH value 2 Drain some Yao water and replenish the bath with bath building agent 3 Reduce bath temperature
white around the hole position	1 The pH value is too low 2 The burr at the workpiece hole is too large	1 Adjust pH value 2 Check the electroplating condition near the hole bit and improve the electroplating process
the color of the hole is too dark and appears burnt yellow	1 The pH value is low 2 XiaoSuan content is too high 3 Too long 4 High temperature	1 Increase the pH value 2 Stop replenishing Yao water and drain some tank liquid to dilute with water 3 Shorten passivation time 4 Lower the temperature
process blooming after passivation (in map pattern)	1 The pH value is too high 2 Too long use time of Yao liquid 3 Low chromium ion concentration	1 Adjust pH value 2 Drain 1 / 5-1 / 10 old bath liquid and supplement bath building with bath building agent 3 Add ty-218