Copper Polishing Agent Before-and-After Treatment Case

Customer Challenge

Copper surfaces are sensitive to oil, fingerprints, air oxidation and machining residues. Standard cleaning can remove part of the contamination but often cannot significantly improve dullness or insufficient brightness. In batch treatment, color difference, local stains and uneven brightness may also occur. The customer needed a stable process to improve surface appearance without significantly changing the part dimensions or base surface condition, while preparing the surface for later passivation, sealing or packaging.

Solution

Minghan recommended a process of degreasing, rinsing, copper polishing, rinsing inspection and optional passivation or sealing protection. Pretreatment removes machining oil, fingerprints and surface contamination. The copper polishing agent improves dull oxidation and insufficient brightness. After thorough rinsing, copper passivation or sealing can be added according to storage and anti-discoloration requirements.

Result

After treatment, the copper surface became noticeably brighter, with visible improvement in dull oxidation, oil residue and local stains. The overall color became more uniform. The polished surface also provided a cleaner and more stable base for subsequent passivation or sealing film formation, helping improve appearance consistency, oxidation resistance and batch shipment stability.