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Fixing
To maintain the anticorrosive properties and aesthetic characteristics achieved over time, aluminum materials subjected to anodizing require a final fixing treatment.
This process consists of closing the pores present in the oxide coating by two different techniques: hydration fixing, which is done hot, and impregnation fixing, which is done cold.
The aluminum is subjected to a final fixing treatment to maintain its anticorrosive properties and aesthetic characteristics over time.
With the first technique, anodized aluminum can be fixed by immersing the material in boiling water at a temperature above 95°C for an average time of 3 minutes per micron of thickness achieved. Due to the temperature effect, the oxide molecules hydrate and produce a swelling that closes the pores of the anodic oxide coating. In this way, the material will be able to resist weathering over time and maintain its aesthetic characteristics.
In the case of impregnation fixing, the material is immersed in a solution containing nickel fluoride salts at an average low temperature (25 to 30°C). According to current regulations, however, the temperature of the solution can be raised up to 60°C to accelerate the pore-closing reaction and facilitate material movement operations.
