Chemical treatment solution achieved with nitric or citric acid. Perfect for critical corrosion-resistant aircraft parts that must withstand harsh environments. AeroCNCParts Offers advanced passivation service of your parts.
Passivation enhances corrosion resistance in stainless steel and reactive metals by removing contaminants and forming a protective oxide layer. With traceability and CMM inspection, AeroCNCParts ensures aerospace-grade reliability and industry-standard compliance for every treated component.
The passivation process maintains part integrity with a slight dimensional change, typically under 0.002 to 0.005mm, ensuring tight tolerance and full compliance with AS9100 standards.
Forms a protective layer on stainless steel, ensuring long-term resistance in harsh aerospace environments.
Extends parts’ lifespan by minimising corrosion and oxidation, reducing maintenance and replacement frequency.
Passivation doesn’t alter dimensional tolerances, maintaining the ±0.005mm precision required for aerospace parts.
Essential for mission-critical components like connectors and housing that are exposed to corrosive conditions.
Enhances adhesion for coatings like alodine, ensuring superior finishing and consistent performance
Integrated with Lot control, FAI, and CMM reporting to ensure complete documentation and quality assurance.
Acid type and concentration
Precise control of nitric or citric acid concentration ensures removal of free iron while maintaining metal integrity.
Temperature Control
Stable bath temperature typically 21 – 71 degrees Celsius
Immersion Time
Controlled exposure time provides thorough passivation while protecting against over-etching of parts
Additives
Certain nitric methods use sodium dichromate accelerators, enhancing film formation and requiring strict safety controls
Alloy Materials
Stainless steel 304, 316 and 17-4PH require tailored passivation formulas to prevent etching.
Standards
All processes adhere to AS9100D, ISO 9001, FAI, Lot control, etc.
Etch/Pitting Control
Parameters are carefully managed to prevent etching or pitting which could compromise aerospace part reliability.
Pre Cleaning
Removal of machining oils, debris is important for effective oxide development during passivation.
High-precision turning ensuring burr-free fluid control surfaces.
Stainless Steel 440C, 17-4 PH
Swiss machined shafts requiring high corrosion and fatigue resistance.
17-4 PH, PH13-8Mo, A-286
Thin-wall turning protecting sensitive electronics in harsh environments.
Stainless Steel 304L, 316L, 303
Aerospace-aligned quality system
Documented and auditable processes
Corrosion-resistant fittings ensure safe, long-term fuel and fluid handling
Corrosion Resistance
Durable fasteners maintain strength and reliability under heavy aerospace loads
Heavy Load Bearing
Strong brackets resist surface degradation under vibration and thermal stress.
Thermal Resistance
Protected connectors housing ensures stable electrical performance in harsh environments.
Signal Integrity| Type | Chemistry Used | Material Compatibility | Process Control | Purpose |
|---|---|---|---|---|
| Nitric Acid Passivation | Nitric acid with dichromate | Most stainless steels; may etch free machining grades | Tight control of time, temp, and concentration | Traditional, proven corrosion protection |
| Citric Acid Passivation | Citric acid, biodegradable | Wide stainless alloy compatibility | Easier, stable control | Eco-friendly, equal protection |
| Electrochemical Passivation | Acid bath with electrical current | Stainless steels, select alloys | Precise voltage control | Faster, uniform oxide layer |
| Proprietary / Modified | Custom blends, nitric-free options | Alloy- or customer-specific | Customized per formulation | Optimized for aerospace/medical needs |
Common Questions on Passivation for Precision Parts
Full material traceability, 100% inspection, AS9100-ready process
