METASU YFB-NAA / NB7（A) / RN7（A）
Trivalent chromium black passivation for chloride bath
<Characteristics>
- Contains trivalent chromium and produces a more appealing black appearance compared to conventional agents.
- Ideal black passivation of zinc plating in chloride bath.
- Longer service life, lower replenishment rate and more attractive appearance are achieved compared to conventional passivation agents.
Track record of replenishment amount being halved. (YUKEN result) - Does not contain silver or dyes.
Product Specifications
Appearance
| Appearance | Dark blue strongly acidic liquid (METASU YFB-NAA) Dark brown strongly acidic liquid (METASU YFB-NB7(A)) Dark reddish-purple strongly acidic liquid (METASU YFB-RN7(A)) Colorless transparent acidic liquid (METASU YFB-ND7) |
|---|
Bath makeup conditions
| Chemicals used | Usage range |
|---|---|
| METASU YFB-NAA | 40 – 60ml/L |
| METASU YFB-RN7(A) | 60 – 100ml/L |
Usage conditions
| Item | Range | Remark |
|---|---|---|
| Process temperature | 30 – 40°C | |
| Process time | 30 – 50 seconds | |
| pH | 1.8 – 2.0 | Verify the pH value before usage. Use caustic soda or hydrochloric acid for adjustment if the pH value falls outside of the specified range. ◎ The pH value must be adjusted to 1.9 during bath makeup. |
| Agitation | Yes | In the case of basket processing, use vibratory agitation. In the case of rack processing, use air agitation or vibratory agitation. |
Replenish conditions
| Chemicals used | Replenishment reference (standard) |
|---|---|
| METASU YFB-NAA | 10 – 30ml/100dm2 |
| METASU YFB-NB7(A) | 30 – 80ml/100dm2 |
| METASU YFB-ND7 | 1 – 4ml/100dm2 |
| Synthetic hydrochloric acid | pH adjustment |
Adjust so that the pH value is within the specified range.
Inquiry about the product
Feel free to contact us if you have any questions or matters to discuss.
