METASU YFB-NAA / NB7（A) / RN7（A）
Trivalent chromium black passivation for chloride bath
- 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.
|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|
|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.
|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.