Pits or white spots
- Likely causes
- Base-metal defects, chloride/particle contamination or over-etching
- First checks
- Compare material lot, pretreatment, rinse and anodizing-bath contamination
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Products & Solutions · 04
Aluminum anodizing
Alloy-specific chemical polishing, etching and desmut are managed through anodizing, dyeing, sealing and nickel leach-out removal.
PROCESS OVERVIEW
Product review starts with process conditions
Alloy composition and pretreatment response directly affect film appearance and color. Film formation, dye adsorption and sealing quality are reviewed through full-process data.
Suitability is reviewed with the substrate, upstream and downstream stages, control items, and required finish—not by product name alone.
- Applicable substrates & targets
- Aluminum and aluminum alloys · Aluminum sheet and machined parts · Precision-machined parts · Decorative components · Functional oxide-film parts
- Application scope
- Chemical polishing · Alkaline etching · Desmut · Sulfuric-acid anodizing · Dyeing · Hot-water or nickel sealing · Nickel leach-out removal
CONTROL POINTS
Key control items to review before application
Current settings and recent changes help establish a more useful inspection sequence.
- 01Alloy and machined surface
- 02Etch amount and desmut reaction
- 03Acid, temperature and current density
- 04Voltage, time and film thickness
- 05Dye concentration, pH and temperature
- 06Sealing temperature, time and water
- 07Color, corrosion and sealing quality
TROUBLESHOOTING
Common issues and first checks
One symptom can involve several process factors, so likely causes and the inspection sequence are reviewed together.
Color variation
- Likely causes
- Film thickness, dye condition, pH, temperature, time or rinse variation
- First checks
- Review positional thickness with dyeing and sealing records
Smut or surface stain
- Likely causes
- Etch/desmut mismatch to alloy or rinse residue
- First checks
- Recheck alloy-specific pretreatment and desmut endpoint
Poor sealing or corrosion
- Likely causes
- Low sealing time/temperature, water/bath contamination or excessive leach-out
- First checks
- Compare sealing analysis, water, time and quality-test results
TECHNICAL SUPPORT
PLACHEM support scope
Field conditions and defect symptoms are used to organize the items that should be checked first.
- 01Alloy-specific pretreatment review
- 02Film, color and sealing control plan
- 03Cause classification for pits, white spots, color shift and stain
- 04Dyeing, sealing and nickel leach-out review
Discuss application conditions for Aluminum anodizing
Share the substrate, process sequence, chemicals in use, control values, defect symptoms, or required documents.