Trivalent chromium clear passivation

Passivation agent with excellent corrosion resistance formulated for barrel plating.


  • Passivation agent that contains trivalent chromium.
  • Coating with high corrosion resistance can be obtained with a single coat.
  • Has self-healing property.
  • Enhances resistance to heat and corrosion.
  • Conventional chromating equipment can be used.

Product Specifications


Appearance Dark purple strongly acidic liquid (METASU YFA-BMA)
Transparent colloidal liquid (METASU YFA-HRA)

Bath makeup conditions

Chemicals used Usage range
METASU YFA-BMA 50 – 150ml/L

Usage conditions

Item Range Remark
Process temperature 30 – 40°C
Process time 20 – 60 seconds
pH 1.8 – 2.2 Verify pH value before usage. Use nitric acid for adjustment if the pH value falls outside of the specified range.
Agitation Yes Use a slow pump-stir setting to allow the concentration of the processing liquid to become homogeneous. To prevent any damage to the surface, allow 5 to 6 seconds of stoppage time before lifting the basket containing the processed products from the vibratory stir.

Replenish conditions

Chemicals used Replenishment reference (standard)
METASU YFA-BMA 10ml/100dm2
METASU YFA-HRA 1 – 3ml/100dm2

Adjust so that the pH value is within the specified range.
Replenish in the ratio of YFA-BMA:YFA-HRA = 10:1 – 3


Inquiry about the product

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