200+ hours salt spray
Exceeds MIL-DTL-5541 aerospace specifications
Passivation · Process-engineered chemistry
UNIPASS-AL CHROMEAluminum Passivation – Chrome
Self-Healing Chromate Protection for Aerospace
200+ h Salt SpraySelf-HealingMIL-DTL-5541Yellow Iridescent
01 / Product brief
Self-Healing Chromate Protection for Aerospace
Hexavalent chromate conversion coating for aluminium producing the classic yellow-iridescent finish. Self-healing mechanism seals micro-defects under service conditions. Delivers 200+ hours salt spray on bare aluminium and provides an excellent base for paints and adhesives.
Self-healing chromate film continues to protect even through minor mechanical damage — a property no chrome-free system fully replicates. For applications where EU RoHS/ELV constraints do not apply, this remains the highest-performance option.
02 / Performance
Key process advantages
Product-specific outcomes for production quality, operating control and line performance.
Self-healing mechanism
Continues protecting through minor mechanical damage
Excellent paint base
Superior adhesion for downstream topcoat systems
04 / Process position
Where it works in the line
Applied at Stage 6 (Passivate) — converts bare aluminium into self-healing chromate film for long-term corrosion protection.
- 01
Degrease
Process stage
- 02
Rinse
Process stage
- 03
De-rust
Process stage
- 04
Rinse
Process stage
- 05
Condition
Process stage
- 06
Phosphate
Process stage
- 07
Passivate
Applied at Stage 6 (Passivate) — converts bare aluminium into self-healing chromate film for long-term corrosion protection.
- 08
Rinse
Process stage
- 09
Dry
Process stage
05 / Applications
Specified for real production demands
Typical applications and substrate conditions for UNIPASS-AL CHROME.
Aerospace components requiring MIL-DTL-5541 compliance
- Aluminium
Military and defence aluminium hardware
- Aerospace Components
High-specification electronics enclosures
- Defence Hardware
Structural aluminium in non-ELV environments
- Aluminium
Technical support
Validate UNIPASS-AL CHROME on your line.
Share your substrate, current bath, throughput and finishing system. Our process team will recommend a practical trial window.