Aluminium Surface Conditioning
Passivation Route for Aluminium Components
Fukar offers aluminium passivation services for applications requiring controlled chemical surface treatment and improved corrosion behavior.
Our team reviews substrate grade, drawing notes, and downstream finish requirements to confirm the most suitable treatment sequence.
Applications
Typical Aluminium Passivation Use Cases
Precision Aluminium Parts
Machined parts needing controlled surface condition before assembly.
Corrosion-Sensitive Components
Components requiring improved resistance in humid or mixed environments.
Pre-Finish Preparation
Surface conditioning stage before additional coating or finishing steps.
Process Overview
What is Aluminium Passivation?
Aluminium passivation is a surface treatment process that creates a thin, stable conversion layer on aluminium and aluminium alloy parts. The layer improves corrosion resistance, prepares the surface for painting or bonding, and reduces the risk of oxidation during storage and service. Unlike anodising, which builds a thicker oxide layer electrochemically, passivation uses a chemical immersion approach that is gentle and suited to precision components with tight tolerances.
At Fukar in Shah Alam, aluminium passivation is applied to machined housings, brackets, heat sinks, electronics enclosures, and connector components. We review alloy grade, surface finish, and downstream requirements to select the correct chemistry, immersion time, and post-treatment sequence. Common routes include chromate conversion and trivalent passivation, depending on customer specification and environmental requirements.
The process is typically integrated with alkaline cleaning, deoxidising, conversion coating, rinsing, and drying. We can support small batch prototyping and recurring production volumes, with inspection records and process certificates available on request.
Typical Specifications
| Substrate | Aluminium and alloys |
|---|---|
| Process type | Chemical immersion |
| Coating thickness | Typically < 1 micron |
| Coating colour | Clear to iridescent |
| Common standards | MIL-DTL-5541, customer specs |
| Application | Corrosion, paint prep |
| Industries | Electronics, aerospace, automotive |
Controlled Process
Aluminium Passivation Steps
1. Alkaline Clean
Removes cutting oils, coolant, and surface contamination from machined parts.
2. Deoxidise
Light etch or deoxidising rinse removes the native oxide for uniform conversion.
3. Conversion Coat
Immersion in passivation chemistry to form the protective conversion layer.
4. Rinse & Dry
Demineralised water rinse and controlled drying stabilise the coating.
Common Questions
Aluminium Passivation FAQs
What is the difference between aluminium passivation and anodising?
Anodising builds a thicker, harder oxide layer electrochemically and changes dimensions. Passivation creates a thinner chemical conversion layer ideal for tight-tolerance parts.
Does passivation change part dimensions?
Passivation adds negligible thickness, usually less than one micron. It is preferred for precision components where anodising would affect fits.
Can passivated aluminium be painted or bonded?
Yes. The conversion layer improves paint adhesion and provides a stable surface for adhesives and sealants.
Which aluminium alloys can be passivated?
Common alloys include 6061, 6063, 7075, and casting alloys. Chemistry and dwell time are adjusted based on alloy composition and customer spec.
Related Services
Anodising
Electrochemical aluminium conversion coating for hardness and corrosion resistance.
View service →Passivation
Stainless passivation route for contamination removal and corrosion support.
View service →Need aluminium surface treatment support?
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