TR-127 Black Zinc Passivation
Black Zinc Passivation Process Control with TR-127
Fengfan TR-127 is a trivalent chromium black passivation agent for plating operations that need a dark, shiny finish after alkaline zinc plating. The listed process window gives engineering teams clear bath targets for concentration, temperature, pH, and immersion time, so trial work can move from sample panels to batch production with fewer variables.
For a plating buyer comparing a trivalent passivation manufacturer or checking a black zinc passivate supplier, TR-127 is most relevant when the sourcing brief asks for trivalent chemistry, black surface appearance, alkaline zinc compatibility, and a sealing step for higher corrosion resistance targets.
Description
TR-127 is presented as a single component trivalent chromium black passivation solution. The product information states that it does not contain hexavalent chromium or silver, can be used after alkaline zinc plating, and forms a dark, shiny passivation film. In production planning, the most important control points are concentration, temperature, pH, immersion time, rinse cleanliness, and the selected sealing process.
Product Specifications
| Product Name | Fengfan Trivalent Chromium Black Zinc Passivation Agent TR-127 |
|---|---|
| Type | Black passivation |
| Model Number | TR-127 |
| Brand | FENGFAN |
| Best Concentration | 100 ml/L |
| Concentration Range | 80-150 ml/L |
| Temperature Range | 25-35°C |
| pH Range | 1.5-2.2 |
| Immersion Time | 30-60 seconds |
| Minimum Order Quantity | 25 kg |
| Packaging | Plastic barrel |
| Payment Terms | T/T, L/C |
Core Supply Advantages
Defined Bath Window
Clear operating ranges help plating engineers build repeatable checks for concentration, pH, temperature, and processing time.
Trivalent Chemistry
The listed formulation avoids hexavalent chromium and silver, supporting safer material selection for export-oriented finishing lines.
Sealing Compatibility
Use with a sealing agent can support stronger corrosion resistance when the buyer validates the full coating system.
Related Technical Articles
These May 2026 references help buyers compare passivation bath control, electroplating chemical selection, and corrosion resistance planning around black zinc finishes.
May 2026
Effective Corrosion Resistance Using Trivalent Black Zinc Passivation
Covers the relationship between bath concentration, temperature, pH, exposure time, and sealing when building corrosion resistance around trivalent black zinc passivation.
Read technical articleMay 2026
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Read technical articleVerified Procurement Feedback
★★★★★
"The clear pH and temperature range helped our plating line set up a controlled black zinc trial before expanding to regular hardware batches."
Process Engineering Manager
Automotive fastener supplier, Mexico
★★★★★
"We needed trivalent black passivation for mixed rack and barrel work. The TR-127 specification gave our purchasing and lab teams a practical baseline."
Purchasing Director
Metal finishing plant, Turkey
★★★★★
"The 25 kg minimum order and plastic barrel packaging were suitable for our sampling plan while we assessed color consistency after sealing."
Quality Supervisor
Industrial component distributor, Poland
Technical FAQ
What process range should be checked before running TR-127 in production?
The listed operating window for TR-127 is 80-150 ml/L, 25-35°C, pH 1.5-2.2, and 30-60 seconds. Before production, the plating team should confirm the zinc deposit is clean, rinse quality is stable, and the passivation bath is mixed to the required concentration. Small trial panels are useful for checking black tone, film clarity, and post-sealing appearance before moving to customer parts.
Why does pH control matter in black zinc passivation?
The pH range affects film formation speed, color depth, and surface uniformity. If the bath moves outside the listed pH 1.5-2.2 range, the coating may form too slowly, become uneven, or show color variation between racks or barrels. Regular pH checks, controlled replenishment, and clean rinsing before passivation help keep the trivalent chromium film repeatable.
Can TR-127 be used after alkaline zinc plating?
Yes. The product information states that TR-127 trivalent chromium black passivation agent can be used for alkaline zinc plating. Buyers should still share the zinc plating process, part geometry, target finish, and any sealing step with the supplier, because upstream deposit quality and rinse control can strongly influence the final black passivation result.
How should sealing be considered with black passivation?
The product page notes that black passivation used with a sealing agent can improve salt spray and corrosion resistance of the coating. In practical sourcing, the buyer should confirm whether sealing is required for the part environment, define drying conditions, and test the complete zinc plating, passivation, and sealing sequence as one system rather than judging the passivate alone.
What information should a plating buyer prepare for supplier evaluation?
A useful evaluation package includes substrate material, zinc plating type, rack or barrel operation, expected black tone, corrosion test target, rinse water condition, bath volume, monthly chemical demand, packaging preference, and any restricted-substance requirement from the final customer. These details help the supplier recommend a practical bath setup and replenishment approach.
What procurement details are visible for TR-127?
The product listing identifies the model as TR-127, brand as Fengfan, origin as China, minimum order quantity as 25 kg, packaging as plastic barrel, and payment terms as T/T or L/C. Buyers should confirm current stock, packing dimensions, export documents, sample availability, and technical support scope during quotation.
