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Anodisation dure
Hard anodizing is an electrochemical process that creates an extremely resistant aluminum oxide layer on the surface of aluminum parts. Unlike classic anodizing, it generates a thicker (25 to 100 microns), harder, and more durable layer.
This treatment is performed in a sulfuric acid bath at a controlled temperature (close to 0 °C) under an electric current. It transforms the surface without adding any material, producing an integrated, non-peelable, and very resistant oxide layer.
Technical Specifications
Advantages of Hard Anodizing
This process is particularly valued in demanding sectors such as aeronautics, automotive, defense, and mechanical engineering. It notably offers:
- High hardness: up to 500 HV (Vickers), close to hardened steel.
- Excellent resistance to wear and abrasion, extending the lifespan of parts.
- Protection against corrosion even in aggressive environments.
- Electrical insulation thanks to a non-conductive layer.
- Optimal adhesion for paints and adhesives via a microporous surface.
- Uniform aesthetic appearance, with the possibility of coloring in some cases.
Typical Applications
- Mechanical parts subject to high stress or friction.
- Components for machine tools and industrial molds.
- Military and extreme sports equipment.
- Aeronautical structures.
- Marine equipment or equipment exposed to humidity.
Compatible Metals
- Pure aluminum (1000 series): good anodizability but a less hard layer.
- Aluminum alloys:
- 2000 series (aluminum-copper): anodization is possible, but with less corrosion resistance.
- 5000 series (aluminum-magnesium): good anodizability.
- 6000 series (aluminum-magnesium-silicon): an excellent compromise for hard anodizing.
- 7000 series (aluminum-zinc): anodizable, with variable results depending on the copper content.
Other Info
Hard Anodizing and Coloring
Here is a translation of the information about coloring and hard anodizing:
What's Possible:
- Electrolytic coloring (bronze, black, dark grey tones).
- Organic coloring (less stable than on standard anodizing).
- Natural shade that varies from grey to dark brown, depending on the alloy, thickness, and process parameters.
Limitations:
- Reduced porosity and thickness limit the penetration of dyes.
- Bright colors (red, blue, green) are difficult to achieve or are not durable.
- The finish is often matte or satin, and rarely glossy.
- The color can vary between batches depending on the alloys used.
Good to Know:
If a specific colored appearance is the top priority (e.g., for design or marketing), classic anodizing is generally preferable. Hard anodizing is primarily a functional treatment focused on mechanical resistance and protection, with coloring being a secondary consideration.
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Contact Us
For a quote submission, please send us the information bellow in the following form or straight to the e-mail address info@placageboucherville.com :
- Type of plating (Anodizing, Passivation, Iridite, Black Oxide)
- Color (If anodizing)
- Material of the part
- Technical drawing of the part
- Quantity
- Telephone
- +1 (450) 641-8229