Siam YUKEN Co., Ltd.

Available surface coatings, black material, corrosion resistance. White rust-free, Thailand.

Trivalent Chromium Black Conversion Coating Agent
Metas YFB-NA7/NB7/RN7 is a long-life trivalent chromium black conversion coating agent that contributes to economy in addition to providing an excellent black appearance.
＜Features＞
・Uses trivalent chromium to achieve a glossier black appearance than conventional methods.
・Ideal for blackening treatment of chloride bath zinc plating.
・Achieves longer life, lower replenishment (1/2 compared to our conventional products), and improved appearance compared to conventional conversion coating agents.
・Corrosion resistance: 120hr to 168hr or more without white rust.
・Does not use silver or paint.
Product Specifications
Properties
Appearance Dark blue strongly acidic liquid (Metas YFB-NA7)
Dark brown strongly acidic liquid (Metas YFB-NB7)
Dark reddish-purple strongly acidic liquid (Metas YFB-RN7)
Colorless transparent acidic liquid (Metas YFB-ND7)
Bath Preparation Conditions
Chemicals Used Usage Range
Metas YFB-NA7 40-60ml/L
Metas YFB-RN7 60-100ml/L
Operating Conditions
Item Range Remarks
Treatment Temperature 30-40℃
Treatment Time 30-50 seconds
pH 1.8-2.0 Please check the pH before use. If the pH is outside the specified range, adjust with caustic soda solution or hydrochloric acid.
Agitation For barrel processing, oscillating agitation.
For rack processing, air agitation or oscillating agitation is required.
Replenishment Conditions
Chemicals Used Replenishment Guideline (Standard)
Metas YFB-NA7 10-30ml/100dm2
Metas YFB-NB7 30-80ml/100dm2
Metas YFB-ND7 1-4ml/100dm2
Synthetic Hydrochloric Acid pH adjustment
*Adjust pH to be within the operating conditions.

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Available surface coatings, black material, corrosion resistance. White rust-free, Thailand.

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