HARDNESS & WEAR RESISTANCE
The wear characteristics of hard anodised aluminium are most favourable at low loads and compare most favourably with hard chromium and high speed steel, in most cases better.
The micro hardness of the coating varies significantly depending on the alloy chosen.
Generally the high strength alloys i.e. 2000 and 7000 alloys produce a micro hardness figure ranging from 250 to 350 micro Vickers and 6000 alloy range 400-500 micro Vickers.
A note of caution should be made when comparing micro hardness to wear resistance, the hardness measured by micron-indentation method does not represent the performance of the material.
It has beenfound that a hard anodised coating measuring 450mv will have a wear resistance of tool steel of 950 mv and even an anodic coating of highcopper alloy such as 2014 measuring 250-280 mv will often offer as much wear resistant as tool steels.