Anodized aluminum


What is anodized aluminum?

Anodizing aluminum is a chemical process by which the surface of aluminum is modified to form a protective layer of aluminum oxide.

The main advantages are:

  • Increased abrasion resistance
  • Corrosion protection
  • Uniformity of surface and maintenance of metallic appearance after printing
  • Prolongation of the useful life of the material

Thanks to the integration of the different production processes, at Alumigraf we can print any design required by the job before the anodic layer has finished sealing, so that the print on our control panels and button panels y nameplates and characteristics are protected by this aluminum oxide layer.


The porous and transparent layer on the surface of the aluminum constitutes the anodic layer and is produced by the anodizing process.

This properly sealed coating is twenty times more wear resistant than a good epoxy coating giving our products greater resistance.


The electrolytically treated but unsealed anodic layer has a high absorption capacity thanks to its micro pores, which allows coloring by means of pigments (ink).

The anodic layer tends to “deteriorate” under ambient temperature and humidity conditions, as it reacts to moisture by expanding (widthwise) and closing the pore.

This generates a layer of aluminum hydroxide, reducing the absorption capacity and sealing it definitively.

If we print the required design before sealing, the pigment is “encapsulated” within the anodic layer.


In the same way, with the anodic layer before final sealing, it is possible to color the whole piece by immersing it in dye.

In this way it is possible to color machined aluminum parts without losing the metallic appearance of aluminum.


We are manufacturers of several product lines such as control panels, nameplates or signage. But one of the most demanded services is the anodizing of parts.

Those customers who want to make their products harder, increasing their durability and useful life, use our anodizing service.


PBaS System

Printed before sealing. An excellent performance solution.

It has a well-known performance in terms of strength and durability.

However, if in addition to the material we also want to protect the printing, it is necessary to print the design before the final sealing.

The raw aluminum (Fig. 0) is subjected to anodizing treatment, creating a thin, porous layer of alumina (Fig. 1). This layer is unstable and its pores tend to close with ambient humidity.

However, before this occurs, it is possible to deposit ink (by printing) or dye (by immersion) inside the alumina pore (Fig. 2).

Once the desired design has been printed, the sealing is accelerated (Fig. 3) so that the print or dye is definitively protected.


With the PRINTED BEFORE SEALING system, the print is protected by the anodic layer itself.

Aluminum oxide, alumina, is a very stable ceramic coating that is resistant to corrosive environmental agents. Moreover, as it is integrated into the material itself, it cannot be scraped or peeled.

Surface printing on anodized aluminum or other material

If the base material used is anodized aluminum, it means that the base aluminum has an anodic layer that protects the aluminum, as explained above.

However, printing on this material does not provide durability to the print, only to the base material.

And in the case of steels or irons, the durability of the print depends on the epoxy ink used, but it will never be as strong as the anodic layer of anodized aluminum.


Engraving requires the removal of part of the surface of the material, so it offers greater durability than surface ink. However, the durability of the engraving depends on the material used and over time it is easy for dirt to be deposited on the engraving.

On the other hand, although it can be filled with ink, the engraving itself does not provide any color.


The Mohs scale is a list of ten minerals ordered by hardness. It is used as a reference for the hardness of a substance. It was proposed by the German geologist Friedrich Mohs in 1825 and is based on the principle that any substance can scratch other softer substances without the opposite happening. Mohs chose ten minerals, to which he assigned a certain number, comparable to their degree of hardness, thus establishing an increasing scale.

The differences between the different scales are relative, so there is not the same hardness distance between Diamond and Aluminum Oxide as between Calcite and Gypsum. He started with talc, which was given the number 1, and ended with diamond, to which he assigned the number 10. Each mineral scratches those that have a lower number assigned to it, and is scratched by those that have a higher number assigned to it.

Other Services

  • Control panels

    Resistant Mostly made of PBS anodized aluminum, the control panels offer higher wear resistance than any other material, whether painted or live such as stainless steel. 100% perosnalizable The shape

  • Urban signage

    Urban signage Urban signage with maximum durability and resistance The urban signage created with the PBaS is perfect to be able to face inclement weather in complete safety. Anodized aluminum