Keller's Etchant
Keller's Reagent
Material Specific
Composition
2ml HF, 3ml HCl, 5ml HNO₃, 190ml H₂O
Mixed
Method
Immersion
Time
15s
Alternative Names
Tags
Reveals
Grain boundaries, precipitates, phases
Typical Results
Standard etchant for aluminum alloys. Reveals grain structure and second phases.
Color Effects
Grain boundaries dark
Compatible Materials
Incompatible Materials
Application Method
Method:immersion
Typical Time:15 seconds
Preparation Notes
CAUTION: HF is extremely hazardous. Mix 2ml HF, 3ml HCl, 5ml HNO₃, and 190ml water in plastic container.
Application Notes
Immerse sample for 10-20 seconds. Swab if needed. Rinse immediately with copious water.
Troubleshooting
HF causes severe burns. Use in fume hood with proper PPE. Have calcium gluconate gel available.
Storage Notes
Store in plastic container. Label clearly. Extremely hazardous.
Alternative Etchants
- 0.5% HF
- Modified Keller's
Similar Etchants
- 0.5% HF