METASU YFB-NA7 / NB7 / RN7
Trivalent chromium black passivation agent
METASU YFB-NA7/NB7/RN7 is a trivalent chromium black passivation agent that not only produces an attractive black surface finish, but is also economical as it renders a longer service life.
・It uses trivalent chromium and produces a more enchanting black finish compared to conventional agents.
・It is ideal for blackening of chlorid zinc plating bath.
・Extended use compared to conventional passivation agents, lower replenishment amount (1/2 of conventional type based on our study), and enhances external appearance.
・No white rust and corrosion resistance lasts for 120hr - 168hr.
・Silver and dyes are not used.
Product specifications
Attributes
| Appearance | Dark blue strongly acidic liquid (METASU YFB-NA7) Dark brown strongly acidic liquid (METASU YFB-NB7) Dark reddish-purple strongly acidic liquid (METASU YFB-RN7) Colorless transparent acidic liquid (METASU YFB-ND7) |
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Bath makeup
| Chemicals used | Usage range | |
|---|---|---|
| METASU YFB-NA7 | 40～60ml/L | |
| METASU YFB-RN7 | 60～100ml/L | |
Usage conditions
| Item | Range | Remarks | |||||
|---|---|---|---|---|---|---|---|
| Process temperature | 30～40℃ | ||||||
| Process time | 30-50 seconds | ||||||
| ｐH | 1.8～2.0 | Verify pH value before using. Adjust using caustic soda or hydrochloric acid if the pH value falls outside of the specified range. | |||||
| Agitation | In the case of basket processing, use vibratory agitation. In the case of rack processing, use air agitation or vibratory agitation. |
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Replenish conditions
| Chemicals used | Replenishment reference (standard) | |
|---|---|---|
| METASU YFB-NA7 | 10～30ml/100dm2 | |
| METASU YFB-NB7 | 30～80ml/100dm2 | |
| METASU YFB-ND7 | 1～4ml/100dm2 | |
| Blended hydrochloric acid | pH adjustment | |
* Adjust so that the pH value is within the specified range.
Inquiries about the product
Feel free to contact us if you have any queries or matters to discuss.
