Hard anodising, also known as hard coating, hard anodising or demacoat, consists of a highly developed inorganic compound layer that is created by physical or chemical deposition on the surface of the substrate material.

Hard anodising is a special electrochemical process for creating extremely hard, wear-resistant and corrosion-resistant oxide layers on aluminium alloys. This process is often used in areas where aluminium parts are exposed to high mechanical stress, abrasion or corrosive environments. Hard anodising creates a thick oxide layer (typically 25 to 100 microns) that drastically increases the surface hardness of aluminium while providing excellent insulation and heat resistance.

Typical areas of application:

1. Aerospace: In the aerospace industry, hard anodising is used to improve the wear and corrosion resistance of aluminium parts such as landing gear components, structural components and panelling. The increased strength and durability are crucial for the high safety and performance requirements of this industry.
2. Automotive industry: Hard anodised aluminium is used in engine parts, brake discs, cylinder liners and other high-performance applications where low weight combined with high load-bearing capacity and corrosion resistance are required.
3. Mechanical engineering: In mechanical engineering, hard anodising is used for components such as pistons, valves, gears and slide rails. The hard oxide layer protects the parts from wear and extends their service life, even with intensive use.
4. Medical technology: The process is used for surgical instruments, orthopaedic implants and other medical devices. The biocompatible and corrosion-resistant surface is ideal for medical applications.
5. Electronics and electrical engineering: Hard anodised components offer excellent insulating properties and are therefore used in capacitors, heat sinks and other electronic components that require high electrical insulation and thermal stability.

• Increased surface hardness and wear resistance
• Excellent corrosion protection, even in aggressive environments
• High thermal resistance and stability
• Good electrical insulation capability
• Low coefficient of friction
• Improved adhesion for paints and lubricants
• Increased service life and reliability of treated components
• Reduced maintenance and repair costs
• Improved resistance to chemical attack and abrasion