Hardcoat anodise, commonly referred to as Type III Anodising, on which a dense and thicker coating is produced under tough controlled conditions of temperature and current density. This will produce a generally Brown / Greenish coating of 60+ microns with 50% build up and 50% penetration.
Hard Coat process results in an extremely hard surface, and is the most desirable electrochemical coating of Marine Environment, vital for metal parts that need to withstand the rigors of a marine environment, high moisture, humidity, salt spray, fuel and petroleum products, chemicals and lubricants. anodised coatings will not chip or peel, and resists ultraviolet (UV) radiation so colours will not fade, even in direct sunlight.
Automotive industry are increasingly recognising Hard Anodise of complex parts such as pistons, anti-lock brake assemblies, pump components, valves, insulation plates and transmission parts.
The number of applications of hard anodised aluminium continues to grow rapidly, manufacturers or users of engineering equipments would be well advised to examine the profitability of hard coated aluminium because of it's unique properties.