Hard Anodising – A Simple Process Which Uses High Temperatures
Hard Anodising is a process which converts the liquid metal into sand, by heating the compound (aluminium oxide) at high temperatures. In comparison to anodising with water, this process produces much less damage. Hard Anodising is a more economical way of applying coatings to metal surfaces, because the heat generated does not lead to corrosion. This process is used to apply many types of protection including reinforcing steel, sheet metal and stainless steel.
As compared to anodising, hard anodising involves a complex process. The compound to be applied is heated to 300 degree Celsius and then the metal oxide is passed through a chemical bath, in the end having its metallic properties changed into sand-like particles. This procedure is usually achieved using high temperature equipment. The particles of the oxide are so small that they can easily be loaded into machinery; the result is extremely hard, smooth and wear resistant material.
Both hard anodising and hard chrome anodizing require application of a clear coat layer. The main difference between these two processes is that chrome is much easier to apply but both require a hard anodising or chrome anodised coating to provide the final application. The main advantage of chrome anodizing over hard chrome is that it is far easier to use because of its consistent appearance and therefore preferred for use in aesthetic applications.