Tarnish or discoloration
- Likely causes
- Weak protection, residue, humidity or sulfur-bearing atmosphere
- First checks
- Check concentration/time, final rinse, packing and storage
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Products & Solutions · 06
Post-treatment & specialty chemicals
Anti-tarnish, protective coatings and specialty cleaning/removal processes improve appearance, corrosion resistance and storage stability after plating.
PROCESS OVERVIEW
Product review starts with process conditions
Post-treatment is the final control stage that preserves the finished deposit. Surface condition immediately after plating, chemical residue, rinsing, drying and storage are reviewed together.
Suitability is reviewed with the substrate, upstream and downstream stages, control items, and required finish—not by product name alone.
- Applicable substrates & targets
- Copper and copper alloys · Silver-plated surfaces · Nickel- and tin-plated surfaces · Contacts and connectors · Decorative and functional parts
- Application scope
- Anti-tarnish and passivation · Transparent protective coating · Specialty cleaning · Oxide or coating removal · Post-plate rinsing and drying
CONTROL POINTS
Key control items to review before application
Current settings and recent changes help establish a more useful inspection sequence.
- 01Condition of the plated surface
- 02Concentration, pH and temperature
- 03Treatment time
- 04Rinsing and residue
- 05Drying temperature and time
- 06Handling, packing and storage
- 07Color, corrosion and contact performance
TROUBLESHOOTING
Common issues and first checks
One symptom can involve several process factors, so likely causes and the inspection sequence are reviewed together.
Stain or water mark
- Likely causes
- Contaminated rinse, poor drainage or delayed drying
- First checks
- Review final-rinse water, part orientation and drying start time
Poor coating adhesion
- Likely causes
- Contamination, excess residue or insufficient drying/curing
- First checks
- Check post-plate surface and wait/dry conditions before coating
Low corrosion or storage life
- Likely causes
- Uneven film, handling contamination or unsuitable packaging
- First checks
- Compare the failure time with lot, packing and storage history
TECHNICAL SUPPORT
PLACHEM support scope
Field conditions and defect symptoms are used to organize the items that should be checked first.
- 01Post-treatment conditions by deposit type
- 02Cause classification for tarnish, stain and coating adhesion
- 03Rinse, dry, pack and store control plan
- 04Upstream/downstream impact of specialty cleaning and removal
Discuss application conditions for Post-treatment & specialty chemicals
Share the substrate, process sequence, chemicals in use, control values, defect symptoms, or required documents.