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.
|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)
|Chemicals used||Usage range|
|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.
|Chemicals used||Replenishment reference (standard)|
|Blended hydrochloric acid||pH adjustment|
* Adjust so that the pH value is within the specified range.
Inquiries about the product
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