In order to keep unaltered over time the anti-corrosive properties and aesthetic features achieved, aluminium materials subjected to anodising require a final fixing treatment.
That process consists of closing the pores present in the oxide coating by way of two techniques:
FIXING BY HYDRATION (hot)
Anodised aluminium can be fixed by immersing the material in boiling water for an average time of 3 minutes for each micron of thickness achieved.
Due to the temperature, the oxide molecules hydrate and produce a swelling that closes the pores of the anodic oxide coating.
In this way, the material can resist over time the action of atmospheric agents and keep unaltered its aesthetic features.
FIXING BY IMPREGNATION (cold)
In order to fix oxide coating in anodised aluminium, it is possible to use a technique known as “fixing by impregnation”. In this case, the material is immersed in a solution containing nickel fluoride salts at a low average temperature (from 25 to 30°C).
According to existing regulations, the temperature of the solution may be raised up to 60°C to accelerate the reaction of closing the pores and to facilitate the operations of repositioning the material.
Aluminium anodising is a process with an anti-corrosive and aesthetic function.
In order to maintain the anti-corrosive properties and aesthetic characteristics unaltered over time.
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