Chromodizing & Pre-Treatment
7-Stage Chemical Conversion Pre-Treatment for Guaranteed Coating Adhesion
Why Pre-Treatment & Chromodizing Matters
Pre-treatment is the foundation of surface finishing longevity. At Brightwell Industries, every metal profile undergoes a rigorous 7-stage chemical pre-treatment process — including alkaline degreasing, chemical etching, de-oxidizing, and yellow/green chromate conversion. This ensures 100% paint bonding and prevents under-film filiform corrosion.
The 7-Stage Chemical Conversion Immersion
Immersion bath sequence ensuring complete surface passivation for 20ft extrusions.
Stage 1: Heavy Duty Degreasing
Removal of drawing oils, grease, and shop dirt in chemical bath.
Stage 2: Water Rinse
Clean water bath wash to prevent chemical drag-out.
Stage 3: Alkaline Etch
Controlled micro-etching to remove natural oxide and create micro-porosity.
Stage 4: Water Rinse
Secondary wash.
Stage 5: Desmutting
Acidic removal of insoluble alloying element smut.
Stage 6: Chromate Conversion
Deposition of amorphous chromate chemical barrier layer.
Stage 7: Demineralized Rinse & Dry
RO water final wash and oven drying at 110°C.
Target Applications
- Mandatory Pre-requisite for Powder Coating & Painting
- Defense & Marine Grade Corrosion Protection
- Long-term Storage De-passivation of Metal Extrusions
Technical Advantages
- Passes 1000+ Hours Salt Spray Corrosion Test
- Eliminates Filiform Corrosion Risk completely
- Ensures Cross-Hatch Adhesion Rating 0 (ISO 2409)
- Standard 20 Feet Immersion Tank Capacity
Ready to Finish Your Extrusions with 25-Year Certified Coating?
Get a fast, competitive quote for Powder Coating, Anodizing, or Wood Finish Sublimation. Contact our technical team in Vashi today.