Brass Passivation Before-and-after Comparison
For brass parts that easily darken, discolor and show uneven appearance after cleaning, Minghan established a degreasing, brass passivation and drying packaging process to improve surface cleanliness, oxidation resistance and storage stability.
Before Brass Passivation
After Brass Passivation
Case Overview
The customer’s brass hardware and copper alloy connectors were prone to surface oxidation, darkening, discoloration, fingerprints and local color variation during machining, cleaning, handling and short-term storage. Based on the high surface activity of copper-zinc alloy, appearance stability requirements and storage cycle, Minghan Chemical provided a degreasing and brass passivation anti-discoloration process to improve surface stability and appearance consistency.
Customer Challenge
Brass surfaces are sensitive to air, sweat, cleaning residue and humid environments. Without effective protection after cleaning, the surface may darken, discolor or develop localized oxidation spots within a short time. The customer needed better anti-discoloration performance during storage, packaging and pre-assembly while maintaining the natural brass appearance and metallic texture as much as possible.
Solution
Minghan recommended a process of degreasing, rinsing, brass passivation, final rinsing and drying packaging. Pretreatment removes machining oil, fingerprints and surface contaminants. The brass passivation agent forms an anti-oxidation protective film on the copper alloy surface, reducing discoloration risk during handling, packaging and transportation.
Result
After treatment, the brass surface became cleaner and more uniform, with visible improvement in dull oxidation, fingerprints and local discoloration. The brass passivation film improved short-term oxidation resistance and anti-discoloration performance, helping reduce storage discoloration, appearance rework and batch shipment risks.
Implementation Process
Sample review
Confirm brass material, oxidation level, oil contamination, appearance requirement and storage cycle.
Degreasing cleaning
Remove machining oil, fingerprints, dust and surface contamination before passivation.
Brass passivation
Match passivation concentration, treatment time and temperature to form an anti-oxidation protective film.
Rinsing control
Rinse thoroughly to reduce residue, water marks and localized uneven appearance.
Drying and packaging
Dry promptly and use clean packaging to reduce secondary contamination and short-term discoloration.
Case Information
Surface condition
Improved from dull oxidation, discoloration and fingerprint residues to a clean and uniform brass finish
Oxidation resistance
Brass passivation film improves short-term anti-discoloration and storage stability
Process compatibility
Suitable for brass hardware, copper alloy connectors, terminals and decorative copper parts
Delivery value
Reduces storage discoloration and appearance rework risk, improving batch shipment stability
Related Industries
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Brass Passivation Before-and-after Case Brief
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