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

ISO 2128:2010 specifies a non-destructive method for determining the thickness of anodic oxidation coatings on aluminium and its alloys using a split-beam microscope.
The method is applicable, in most industrial cases, to anodic oxidation coatings above 10 μm, or above 5 μm when the surface is smooth.
The use of the method specified is limited by the need for the two luminous lines described in Clause 3 to be visible and distinctly separated, i.e. not in the case of opaque or dark-coloured coatings.

Anodisieren von Aluminium und Aluminiumlegierungen - Bestimmung der Dicke von anodisch erzeugten Oxidschichten - Zerstörungsfreie Messung mit Lichtschnittmikroskop (ISO 2128:2010)

Diese Internationale Norm legt ein zerstörungsfreies Verfahren zur Bestimmung der Dicke anodisch erzeugter
Oxidschichten auf Aluminium und Aluminiumlegierungen unter Einsatz eines Lichtschnittmikroskops fest.
Das Verfahren ist anwendbar für die meisten industriell anodisch erzeugten Oxidschichten über 10 μm oder
bei glatten Oberflächen über 5 μm.
Die Anwendung des beschriebenen Verfahrens ist nur möglich, wenn die beiden in Abschnitt 3 beschriebenen
Lichtbänder gut sichtbar und eindeutig voneinander getrennt sind, d. h. nicht bei opaken oder dunkel
gefärbten Schichten.
ANMERKUNG Probleme können auch durch die Oberflächenrauheit auftreten.

Anodisation de l'aluminium et de ses alliages - Détermination de l'épaisseur des couches anodiques - Méthode non destructive par microscope à coupe optique (ISO 2128:2010)

L'ISO 2128:2010 spécifie une méthode non destructive pour déterminer l'épaisseur des couches anodiques sur l'aluminium et ses alliages en utilisant un microscope à coupe optique.
Cette méthode est applicable, dans la plupart des cas industriels, aux couches anodiques d'épaisseur supérieure à 10 µm, ou supérieure à 5 µm lorsque la surface est lisse.
L'utilisation de la méthode spécifiée est limitée par la nécessité que les deux lignes lumineuses décrites dans le principe soient visibles et nettement séparées, c'est-à-dire qu'elle n'est pas applicable aux couches opaques ou de couleurs sombres.

Anodizacija aluminija in aluminijevih zlitin - Ugotavljanje debeline anodno oksidiranih prevlek - Neporušitveno merjenje z interferenčnim mikroskopom (ISO 2128:2010)

Ta mednarodni standard določa neporušitveno metodo za ugotavljanje debeline anodno oskidiranih prevlek na aluminiju in njegovih zlitinah z uporabo interferenčnega mikroskopa. Metoda v večini industrijskih primerov velja za anodne oksidirane prevleke nad 10 μm, ali nad 5 μm, če je površina gladka. Uporaba metode je omejena s potrebo po dveh vidnih in jasno ločenih svetlobnih črtah, opisanih v točki 3, tj. ni uporabna pri neprozornih ali temnih prevlekah.

General Information

Status
Published
Publication Date
31-Aug-2010
Withdrawal Date
30-Mar-2011
ICS
25.220.20 - Surface treatment
Technical Committee
CEN/TC 132 - Aluminium and aluminium alloys
Drafting Committee
CEN/TC 132/WG 15 - Aluminium anodisation
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
01-Sep-2010
Completion Date
01-Sep-2010
Ref Project
SIST EN ISO 2128:2012 - Anodizing of aluminium and its alloys - Determination of thickness of anodic oxidation coatings - Non-destructive measurement by split-beam microscope (ISO 2128:2010)

Relations

Replaces
EN 12373-3:1998 - Aluminium and aluminium alloys - Anodizing - Part 3: Determination of thickness of anodic oxidation coatings - Non-destructive measurement by split-beam microscope
Effective Date
08-Jun-2022

Overview

EN ISO 2128:2010 specifies a non‑destructive method for determining the thickness of anodic oxidation (anodizing) coatings on aluminium and its alloys using a split‑beam (split‑image) microscope. The procedure is widely used in industry for anodic coatings typically above 10 µm, or above 5 µm when the surface is smooth. The method requires that two luminous lines (reflections from the coating surface and the metal/coating interface) are visible and distinctly separated, so it is not suitable for opaque or dark‑coloured coatings.

Key topics and requirements

  • Measurement principle: A parallel lamellar beam is incident (generally at 45°) on the anodized surface. Two reflected lines are produced in the ocular; the distance between them is proportional to the coating thickness and depends on the coating refractive index (n ≈ 1.59–1.62) and instrument geometry.
    • Formula (approx): e ≈ 2.04 · e' (e = true thickness, e' = apparent thickness). Using e ≈ 2 · e' is stated as providing adequate accuracy for many instruments.
  • Apparatus: A split‑beam microscope specially designed for transparent coating thickness measurement. Instruments may be calibrated to read true thickness directly; calibration must be checked against an anodized sample whose thickness was determined by the micrographic section (destructive) method.
  • Procedure: Readings are taken using a graticule/vernier in the microscope ocular; follow manufacturer instructions and agree the inspection area between supplier and customer.
  • Sampling and expression of results:
    • Measure at not less than 10 points across the inspection area and report the arithmetic mean.
    • Exclude anomalous values deviating more than ±10% from the mean; replace each anomalous value once by two further measurements. Anomalous values must not exceed 30% of total measurements.
    • If anomalies persist, report the mean with the mean deviation.
  • Test report must include reference to the Standard, product ID, results, mean deviation (if applicable), unusual observations, and date.

Applications and users

  • Practical for quality control, incoming inspection, and production monitoring of anodized aluminium components in:
    • Architectural aluminium and façades
    • Automotive and transport components
    • Consumer electronics and appliances
    • Aerospace interiors and secondary structures
  • Typical users: QC engineers, coating inspectors, material laboratories, anodizing suppliers, and procurement specialists specifying coating thickness requirements.

Related standards

  • EN ISO 2128:2010 supersedes EN 12373‑3:1998 and cancels/replaces ISO 2128:1976 (first edition).
  • Normative work developed by ISO/TC 79 (Light metals and their alloys), CEN/TC 132 (Aluminium and aluminium alloys).

Keywords: EN ISO 2128:2010, anodizing, anodic oxidation coatings, thickness measurement, split‑beam microscope, non‑destructive testing, aluminium.

Frequently Asked Questions

EN ISO 2128:2010 is a standard published by the European Committee for Standardization (CEN). Its full title is "Anodizing of aluminium and its alloys - Determination of thickness of anodic oxidation coatings - Non-destructive measurement by split-beam microscope (ISO 2128:2010)". This standard covers: ISO 2128:2010 specifies a non-destructive method for determining the thickness of anodic oxidation coatings on aluminium and its alloys using a split-beam microscope. The method is applicable, in most industrial cases, to anodic oxidation coatings above 10 μm, or above 5 μm when the surface is smooth. The use of the method specified is limited by the need for the two luminous lines described in Clause 3 to be visible and distinctly separated, i.e. not in the case of opaque or dark-coloured coatings.

ISO 2128:2010 specifies a non-destructive method for determining the thickness of anodic oxidation coatings on aluminium and its alloys using a split-beam microscope. The method is applicable, in most industrial cases, to anodic oxidation coatings above 10 μm, or above 5 μm when the surface is smooth. The use of the method specified is limited by the need for the two luminous lines described in Clause 3 to be visible and distinctly separated, i.e. not in the case of opaque or dark-coloured coatings.

EN ISO 2128:2010 is classified under the following ICS (International Classification for Standards) categories: 25.220.20 - Surface treatment. The ICS classification helps identify the subject area and facilitates finding related standards.

EN ISO 2128:2010 has the following relationships with other standards: It is inter standard links to EN 12373-3:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN ISO 2128:2010 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


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Anodizing of aluminium and its alloys - Determination of thickness of anodic oxidation
coatings - Non-destructive measurement by split-beam microscope (ISO 2128:2010)
Anodisieren von Aluminium und Aluminiumlegierungen - Bestimmung der Dicke von
anodisch erzeugten Oxidschichten - Zerstörungsfreie Messung mit Lichtschnittmikroskop
(ISO 2128:2010)
Anodisation de l'aluminium et de ses alliages - Détermination de l'épaisseur des couches
anodiques - Méthode non destructive par microscope à coupe optique (ISO 2128:2010)
Ta slovenski standard je istoveten z: EN ISO 2128:2010
ICS:
25.220.20 Površinska obdelava Surface treatment
77.120.10 Aluminij in aluminijeve zlitine Aluminium and aluminium
alloys
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 2128
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2010
ICS 25.220.20 Supersedes EN 12373-3:1998
English Version
Anodizing of aluminium and its alloys - Determination of
thickness of anodic oxidation coatings - Non-destructive
measurement by split-beam microscope (ISO 2128:2010)
Anodisation de l'aluminium et de ses alliages - Anodisieren von Aluminium und Aluminiumlegierungen -
Détermination de l'épaisseur des couches anodiques - Bestimmung der Dicke von anodisch erzeugten
Méthode non destructive par microscope à coupe optique Oxidschichten - Zerstörungsfreie Messung mit
(ISO 2128:2010) Lichtschnittmikroskop (ISO 2128:2010)
This European Standard was approved by CEN on 31 August 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2128:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 2128:2010 has been prepared by Technical Committee ISO/TC 79 "Light metals and their
alloys" of the International Organization for Standardization (ISO) and has been taken over as
which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2011, and conflicting national standards shall be withdrawn at
the latest by March 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12373-3:1998.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 2128:2010 has been approved by CEN as a EN ISO 2128:2010 without any modification.

INTERNATIONAL ISO
STANDARD 2128
Second edition
2010-09-01
Anodizing of aluminium and its alloys —
Determination of thickness of anodic
oxidation coatings — Non-destructive
measurement by split-beam microscope
Anodisation de l'aluminium et de ses alliages — Détermination de
l'épaisseur des couches anodiques — Méthode non destructive par
microscope à coupe optique
Reference number
ISO 2128:2010(E)
©
ISO 2010
ISO 2128:2010(E)
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