Global Solutions for fragrance and cosmetic packaging

Aluminium Anodizing

The Anodizing process of our pieces has two objectives:

  • The first is to protect the aluminium against external aggressions such as natural oxidation or deterioration of the appearance due to scratches and friction.

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  • The second is the aesthetic function. Through variations in the process itself, different surface finishes and colours are obtained.

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Covit has:

  • A full automatic high-performance anodizing line with the latest technology available in the market.
  • High capacity anodizing for special colours.
  • Chemical and electrolytic polishing.
  • A "baby line" and laboratory to develop special colours.
  • Automatic rack mounting.
  • Automatic rack unmounting.

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The process consists of different phases:


1- Degreasing of pieces

The removal of oil from the drawing process.


2- Chemical or electrolytic polishing

This process consists of levelling the aluminium surface structure aluminum to obtain a mirror surface where the reflected light is maximized and therefore achieves the highest brilliance. The process can be obtained through the chemical reaction of inorganic acids called chemical polishing or by an electrochemical reaction of inorganic acids called electrochemical polishing.

3- Satin or matt finishes

Different from phase 2, when a matt or satin finish is desired on the pieces. The surface is attacked by alkaline or other substances that give a rough finish to the surface so that light is reflected diffusely.  Through modifying several variables of the bath treatment, various degrees of matt finishes can be obtained.


4- Oxidation

Consists of building a layer of aluminium oxide on the surface of the piece through an electrolytic process using electricity in a sulfuric acid solution with two objectives:

  • Protection: Through the hardness of the aluminum oxide layer, the surface is protected against the effects of shocks and friction and therefore remains unchanged by small manipulations.
  • Aesthetics: The porosity of this layer of aluminium oxide makes it suitable to colour and gives the desired aesthetic finish for the perfumery and cosmetic industries.


5- Sealing

Consists of making the properties of the aluminium oxide layer, formed in the previous phase, durable and resistant. Its effect is to close or seal the pores produced, both to maintain unaltered the surface contamination of the pores and to prevent the loss of colour deposited on them.

The closing of these pores is obtained by chemical solutions or water at a high temperature to result in the formation of large hydrated molecules on pores that facilitate sealing.


6- Rinsing

Between the different phases of the anodizing process the pieces are rinsed with deionized water.


7- Drying

The last phase of the process dries the pieces in ovens with air at high temperatures.