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Hard Anodising and Semi Hard Anodising

Hard anodising was first developed by Russian scientists to produce a metal surface tough enough for space travel. The same technology is now used by ALU-FIN. Through a process of electrolysis at sub-zero temperature using a high intensity electric current, 35 to 100 micron thick layer of aluminium oxide (Al2O3) as per requirement is formed molecule by molecule as an integral part of the metal. This process produces a surface harder than steel.

Hard anodising produces harder coatings than the normal 'decorative' process, but the exact shade depends upon coating thickness and anodising conditions (which we can control), as well as alloy, thermal history, degree of hot or cold work, etc., over which we have no control.

Advantages of Hard Anodising

  • Excellent thermal conductivity.
  • Good malleability and ductility.
  • Imparts a surface as hard as some gemstones.
  • Increase in the surface hardness up to 1000 V.P.N.
  • Excellent lubricating properties especially for continuously moving parts.
  • Excellent corrosion and abrasion resistance.

  • Enhancement of working life.
  • The Hard Anodised surface is non-toxic, non-staining and non-reactive with foods. It is thermal-efficient, heats fast and evenly and is not spoiled by high heat. It is tough and durable, will not tarnish or corrode and will stay looking new for years.

Applications Include

  • Defence components
  • Pneumatic Cylinder Tubes
  • Pneumatic Valve Spools
  • Pump Components
  • Automotive Hydraulic Components
  • Pulleys
  • both Vee and Timing types
  • Plasma etching equipment
  • Drugs Machinery
  • Food Handling Machinery
  • Plastics Machinery
  • Pistons
  • Cylinders
  • Actuators
  • Engine Blocks
  • Solenoid Valves Aluminium Castings
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