European standards: anodizing aluminum

Below are the European standards for anodizing aluminum and aluminum profiles. Usually, this is – international ISO standards without any changes. In addition to test methods for acceptance of finished anodic oxide coatings, these standards contain specifications for the production of anodic oxide coatings, as well as useful recommendations for anodizing technology for aluminum and aluminum alloys.

EN ISO 2085:2010

Anodizing of aluminium and its alloys – Check for continuity of thin anodic oxidation coatings – Copper sulfate test (ISO 2085:2010)

Anodizing of aluminum and its alloys - Continuity control of thin anodic-oxide coatings - Test using copper sulfate (ISO 2085:2010)

This international standard establishes a method for monitoring the continuity of thin anodic oxide coatings on aluminum and its alloys by means of a contact test using copper sulfate..

The use of this method is limited to anodic oxide coatings with a thickness of less than 5 microns or coatings, which underwent deformation.

EN ISO 2106:2011

Anodizing of aluminium and its alloys – Determination of mass per unit area (surface density) of anodic oxidation coatings – Gravimetric method (ISO 2106:2011)

Anodizing of aluminum and its alloys - Determination of mass per unit area (surface density) of the anodic-oxide coating - Gravimetric method (ISO 2106:2011)

This International Standard specifies a gravimetric method for the determination of mass per unit area (areal density) of anodic oxide coatings of aluminum and its alloys..

This method can be applied to all anodic oxide coatings., formed on aluminum and its alloys, like foundries, and deformable. Suitable for most aluminum alloys, except, in which the copper content exceeds 6 %.

EN ISO 2128:2010

Anodizing of aluminium and its alloys – Determination of thickness of anodic oxidation coatings – Non-destructive measurement by split-beam microscope (ISO 2128:2010)

Anodizing of aluminum and its alloys - Determining the thickness of anodic oxide coatings - Non-destructive measurement using a split-beam laser microscope

This international standard establishes a non-destructive method for determining the thickness of the anodic oxide coating on aluminum and its alloys using a split-beam laser microscope.

The method can be applied in most industrial conditions to anodic oxide coatings with a thickness greater than 10 microns or more 5 microns for a smooth surface. This method is not applicable to opaque or dark colored coatings..

EN ISO 2143:2010

Anodizing of aluminium and its alloys – Estimation of loss of absorptive power of anodic oxidation coatings after sealing – Dye-spot test with prior acid treatment (ISO 2143:2010)

Anodizing of aluminum and its alloys - Evaluation of the loss of the ability to absorb anodic oxide coatings after filling - Test with a drop of dye with preliminary acid treatment (ISO 2143:2010)

This International Standard establishes a method for assessing the loss of absorption capacity of anodic oxide coatings., that have undergone pore filling surgery, by evaluating dye absorption after acid pretreatment

This method is suitable for industrial quality control and anodic oxide coatings., which may be exposed to climatic influences or aggressive environments, and, if stain resistance is an important characteristic of a coating.

This method is not applicable to coatings., which:

a) formed on alloys, containing more 2 % copper and 4 % silicon;

b) were filled in a dichromate solution;

c) underwent additional operations, for example, lubrication, waxing or varnishing;

d) painted in dark colors;

e) have a thickness of less 3 m.

This method is less suitable for cases, when the filling bath contains nickel or cobalt salts, as well as organic additives.

EN ISO 2376:2010

Anodizing of aluminium and its alloys – Determination of electric breakdown potential (ISO 2376:2010)

Anodizing of aluminum and its alloys - Determination of the electrical breakdown potential (ISO 2376:2010)

This International Standard establishes test methods for determining the electrical breakdown potential of anodic oxide coatings on aluminum and its alloys., which are formed on flat or almost flat surfaces, as well as round wire. These methods can be applied to anodic oxide coatings., which are used as electrical insulators. Methods do not apply to coatings near trimmed edges, hole edges or sudden changes in surface shape, for example, for extruded profiles.

EN ISO 2931:2010

Anodizing of aluminium and its alloys – Assessment of quality of sealed anodic oxidation coatings by measurement of admittance (ISO 2931:2010)

Anodizing of aluminum and its alloys - Evaluation of the quality of the filled anodic oxide coating by measuring the electrical conductivity (ISO 2931:2010)

This international standard establishes a method for assessing the quality of filling the pores of the anodic oxide coating on aluminum and its alloys by measuring its electrical conductivity. The method is applied to anodic oxide coatings, who underwent the operation of filling pores in the aquatic environment. This method can be used in production control., and, as agreed between manufacturer and customer, during acceptance tests. This method is applicable for any type of anodizing provided there is sufficient area (a circle with a diameter of about 20 mm) and thickness over 3 m.

EN ISO 3210:2010

Anodizing of aluminium and its alloys – Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in phosphoric acid/chromic acid solution (ISO 3210:2010)

Anodizing of aluminum and its alloys - Assessing the quality of filling the pores of the anodic oxide coating by measuring the weight loss after immersion in a solution of phosphoric and chromic acids.

This international standard establishes methods for assessing the quality of filling the pores of the anodic oxide coating on aluminum and its alloys by measuring the weight loss after immersion in a solution of phosphoric and chromic acids.

The standard contains the following two methods:

  • Method 1: assessment of the quality of the filling of the anodic oxide coating by measuring the weight loss after immersion in a solution of phosphoric and chromic acids without preliminary acid treatment.
  • Method 2: assessment of the quality of the anodic oxide coating filling by measuring the weight loss after immersion in a solution of phosphoric and chromic acids with preliminary acid treatment.

Method 1 used for anodic oxide coatings, intended for decorative or protective purposes, or when stain resistance is an important characteristic of a coating.

Method 2 used for anodic-oxide coatings of products and parts for construction purposes.

These methods do not apply in the following cases:

  • solid anodic oxide coatings, which usually do not undergo a pore filling operation;
  • anodic oxide coatings, which were filled only in dichromate solutions;
  • anodic oxide coatings, which were produced in chromic acid solutions;
  • anodic oxide coatings, which were hydrophobic treated.

EN ISO 3211:2010

Anodizing of aluminium and its alloys – Assessment of resistance of anodic oxidation coatings to cracking by deformation (ISO 3211:2010)

Anodizing of aluminum and its alloys - Assessment of the resistance of anodic-oxide coatings to cracking during deformation (ISO 3211:2010)

This international standard establishes an empirical method for assessing the resistance of anodic oxide coatings to deformation cracking.. This method is used in particular for sheet material with anodic oxide coating with a thickness of less than 5 mm, as well as for research purposes.

EN ISO 6581:2010

Anodizing of aluminium and its alloys – Determination of the comparative fastness to ultraviolet light and heat of coloured anodic oxidation coatings (ISO 6581:2010)

Anodizing of aluminum and its alloys - Determination of the comparative resistance to ultraviolet light and heat of colored anodic-oxide coatings (ISO 6581:2010)

This international standard establishes a comparative method for determining the resistance of painted anodic oxide coatings to ultraviolet light and heat.. The method is not suitable for testing painted anodic oxide coatings, which are sensitive to heat.

EN ISO 7599:2010

Anodizing of aluminium and its alloys – General specifications for anodic oxidation coatings on aluminium (ISO 7599:2010)

Anodizing of Aluminum and Its Alloys - General Specification for Anodic-Oxide Coatings on Aluminum (ISO 7599:2010)

This international standard sets the technical requirements for decorative and protective anodic oxide coatings on aluminum and aluminum alloys.. Standard:

  • contains definitions for the technical characteristics of anodic oxide coatings;
  • gives test methods for these technical characteristics;
  • establishes minimum requirements for anodic oxide coatings;
  • provides information on grades of aluminum and aluminum alloys, which are suitable for anodizing;
  • indicates the importance of pretreatment of aluminum products to provide a specified appearance or surface texture.

The standard does not apply to:

  • non-porous oxide coatings based on a barrier layer;
  • oxide coatings, made by anodizing in chromic or phosphoric acid;
  • oxide coatings, intended only for surface preparation with subsequent application of organic coatings or electrical deposition of metals;
  • solid anodic oxide coatings, mainly used for technical purposes, for which the main characteristic is resistance to abrasive wear (see. ISO 10074).

EN ISO 7668:2010

Anodizing of aluminium and its alloys – Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees (ISO 7668:2010)

Anodizing of aluminum and its alloys - Measurement of specular reflection and specular gloss of anodic oxide coatings at an angle of 20º (method A), 45º (method B), 60º (method C) and 85º (method) D) (ISO 7668:2010).

Anodizing of aluminum and its alloys - Measurement of specular reflection and specular gloss of anodic-oxide coatings of flat samples of anodized aluminum using angles of 20º (method A), 45º (method B), 60º (method C) and 85º (method D), as well as specular reflection at an additional angle of 45º (method E), which runs in a narrow angle of reception. These methods are primarily intended for use on colorless anodized surfaces..

EN ISO 8251:2011

Anodizing of aluminium and its alloys – Measurement of abrasion resistance of anodic oxidation coatings (ISO 8251:2011)

Anodizing of aluminum and its alloys - Measurement of resistance to abrasive wear of anodic-oxide coatings (ISO 8251:2011)

This International Standard specifies the following three test methods:

  • Abrasive wheel test method: determination of wear resistance and wear index of anodic-oxide coatings on flat specimens of aluminum and aluminum alloys when tested on an abrasive wheel.
  • Abrasive Blast Test Method: Comparative Testing of the Wear Resistance of Anodic Oxide Coatings on Aluminum and Aluminum Alloys and Standard or Reference Specimens by Blasting Abrasive Particles.
  • Falling Sand Wear Test Method: Determining the Abrasion Resistance of Thin Anodic Oxide Coatings by Exposing them to Falling Sand.

The application of these methods for solid anodic oxide coatings is described in ISO 10074.

A source:
Catalogue of European standards in the aluminium and aluminium alloys field, 2016