Yi-Chun LinPh.D.Taiwan
Laser Materials ProcessingPublished
Dec 16, 2025
Acid Pickling Stains Contamination
After pickling process, residue forms from acid and iron salts on steel surfaces so contamination builds up. This residue shows crystalline patterns, distinct from rust because it dissolves in water unlike fixed oxides. On stainless steel, it causes pitting and laser cleaning removes it effectively by targeted ablation without damaging substrate.
Safety Information
Critical safety data for laser removal operations
Fire/Explosion Risk
low
Toxic Gas Risk
moderate
Visibility Hazard
moderate
Required Personal Protective Equipment
Respiratory Protection
full_face
Eye Protection
goggles
Skin Protection
gloves
Hazardous Fumes Generated
| Compound | Concentration | Exposure Limit | Hazard Class | Status |
|---|---|---|---|---|
| Iron Oxide Fume | 5 mg/m³ | 5 mg/m³ | irritant | ✓ Within Limit |
| Hydrogen Chloride | 2.5 mg/m³ | 2.5 mg/m³ | corrosive | ✓ Within Limit |
| Nitrogen Dioxide | 1.5 mg/m³ | 0.9 mg/m³ | toxic | ⚠️ Exceeds Limit |
Ventilation Requirements
Air Changes Per Hour
12
Exhaust Velocity
0.5 m/s
Filtration Type
dual
Particulate Generation
Respirable Fraction
70%
Size Range
0.1 - 10 μm
Substrate Compatibility Warnings
- •Laser cleaning may concentrate acid residues in surrounding areas
- •Moisture in air can react with residues to form corrosive mists
- •Chloride residues can lead to pitting corrosion if not fully removed
