EN ISO 3211:2018

Anodizing of aluminium and its alloys - Assessment of resistance of anodic oxidation coatings to cracking by deformation (ISO 3211:2018)

This document specifies an empirical method for assessing the resistance of anodic oxidation coatings to cracking by deformation.
The method is applicable particularly to sheet material with anodic oxidation coatings of thickness less than 5 µm, and is useful for development purposes.
NOTE       If the test specimen is thick, more than 5 µm of coating can be measured (see Clause 9).

Anodisieren von Aluminium und Aluminiumlegierungen - Prüfung der Beständigkeit von anodisch erzeugten Oxidschichten gegen Rissbildung durch Verformung (ISO 3211:2018)

Anodisation de l'aluminium et de ses alliages - Évaluation de la résistance des couches anodiques à la formation de criques par déformation (ISO 3211:2017)

Le présent document spécifie une méthode empirique permettant d'évaluer la résistance des couches anodiques à la formation de criques par déformation.
La méthode est applicable particulièrement aux matériaux en feuille avec une couche anodique d'une épaisseur inférieure à 5 μm, et est utilisée pour le développement.
NOTE       Si l'éprouvette est épaisse, une couche de plus de 5 μm peut être évaluée (voir Article 9).

Anodizacija aluminija in aluminijevih zlitin - Ocenjevanje odpornosti anodiziranih plasti proti razpokanju zaradi deformacije (ISO 3211:2018)

Ta dokument določa empirično metodo za ocenjevanje odpornosti anodiziranih plasti proti razpokanju zaradi deformacije.
Metoda se uporablja še zlasti za materiale v obliki plošč z anodiziranimi plastmi debeline manj kot 5 μm in je uporabna za namene razvoja.
OPOMBA: Če je preskušanec debel, se lahko izmeri več kot 5 μm plasti (glej točko 9).

General Information

• Status: Published
• Publication Date: 18-Dec-2018
• Withdrawal Date: 29-Jun-2019
• ICS: 25.220.20 - Surface treatment
• Technical Committee: CEN/TC 132 - Aluminium and aluminium alloys
• Drafting Committee: CEN/TC 132 - Aluminium and aluminium alloys
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 19-Dec-2018
• Completion Date: 19-Dec-2018
• Ref Project: SIST EN ISO 3211:2019 - Anodizing of aluminium and its alloys - Assessment of resistance of anodic oxidation coatings to cracking by deformation (ISO 3211:2018)

Relations

• Replaces: EN ISO 3211:2010 - Anodizing of aluminium and its alloys - Assessment of resistance of anodic oxidation coatings to cracking by deformation (ISO 3211:2010)
• Effective Date: 24-Aug-2016

Overview

EN ISO 3211:2018 - "Anodizing of aluminium and its alloys - Assessment of resistance of anodic oxidation coatings to cracking by deformation" - specifies an empirical test method for evaluating how anodic (anodized) coatings resist cracking when the substrate is deformed. The method is intended primarily for sheet material with anodic oxidation coating thicknesses below 5 µm and is particularly useful during product development and coating optimization. The standard is the CEN-adopted version of ISO 3211:2018.

Key topics and requirements

• Scope and applicability
  • Empirical bend-test method for anodic oxidation coatings on aluminium and alloys.
  • Particularly aimed at sheet material and coatings < 5 µm (provisions exist for thicker coatings - see test report requirements).
• Test specimen
  • Sampling from a flat, representative surface (avoid edges).
  • Typical specimen size: 250 mm × 20 mm, maximum thickness 3 mm.
  • Clean, free from contaminants; solvents that alter the surface must not be used.
• Apparatus
  • A spiral plate instrument graduated with a deformation index E (1–18). Each index corresponds to a radius of curvature (e.g., E1 = 200 mm down to E18 = 30 mm).
  • Clamping screws to secure specimen ends.
• Procedure
  • Clamp specimen (significant surface outwards) and bend progressively along the spiral until first cracks in the anodic coating appear.
  • If cracks are hard to see, the copper sulfate visibility test (ISO 2085) may be used to reveal discontinuities.
  • Record which clamping screw started the bend and the deformation index where first cracking occurs.
• Results
  • The outcome is reported as a percentage elongation derived from the specimen thickness and the measured radius of curvature (see Clause 8).
• Test report essentials
  • Must reference ISO 3211:2018 and include product ID, test result, specimen and coating thickness, deformation index, extruded direction (if applicable), starting clamping screw, anomalies, and test date.

Applications and who uses it

• Quality control and R&D in anodizing plants, aluminium finishing shops and coating laboratories.
• Materials and process engineers optimizing anodizing baths, pretreatment and coating thickness.
• Product designers and specifiers who need to compare coating performance under deformation (e.g., architectural panels, automotive body panels, consumer electronics enclosures).
• Contract compliance and technical assessment where resistance to cracking during forming is a requirement.

Related standards

• ISO 2085 - Copper sulfate test for revealing discontinuities in thin anodic coatings (referenced for crack visibility).
• ISO 7583 - Terms and definitions for anodizing of aluminium and its alloys (terminology used in ISO 3211).

Keywords: EN ISO 3211:2018, anodizing, anodic oxidation coatings, cracking by deformation, deformation index, spiral bend test, aluminium coatings, coating elongation, ISO 3211.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2019
1DGRPHãþD
SIST EN ISO 3211:2012
Anodizacija aluminija in aluminijevih zlitin - Ocenjevanje odpornosti anodiziranih
plasti proti razpokanju zaradi deformacije (ISO 3211:2018)
Anodizing of aluminium and its alloys - Assessment of resistance of anodic oxidation
coatings to cracking by deformation (ISO 3211:2018)
Anodisieren von Aluminium und Aluminiumlegierungen - Prüfung der Beständigkeit von
anodisch erzeugten Oxidschichten gegen Rissbildung durch Verformung (ISO
3211:2018)
Anodisation de l'aluminium et de ses alliages - Évaluation de la résistance des couches
anodiques à la formation de criques par déformation (ISO 3211:2017)
Ta slovenski standard je istoveten z: EN ISO 3211:2018
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.

EN ISO 3211
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 25.220.20 Supersedes EN ISO 3211:2010
English Version
Anodizing of aluminium and its alloys - Assessment of
resistance of anodic oxidation coatings to cracking by
deformation (ISO 3211:2018)
Anodisation de l'aluminium et de ses alliages - Anodisieren von Aluminium und
Évaluation de la résistance des couches anodiques à la Aluminiumlegierungen - Prüfung der Beständigkeit
formation de criques par déformation (ISO 3211:2017) von anodisch erzeugten Oxidschichten gegen
Rissbildung durch Verformung (ISO 3211:2018)
This European Standard was approved by CEN on 27 October 2018.

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-CENELEC 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-CENELEC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3211:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 3211:2018) has been prepared by Technical Committee ISO/TC 79 "Light
metals and their alloys" in collaboration with Technical Committee CEN/TC 132 “Aluminium and
aluminium alloys” the secretariat of 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 June 2019, and conflicting national standards shall be
withdrawn at the latest by June 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3211:2010.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 3211:2018 has been approved by CEN as EN ISO 3211:2018 without any modification.

INTERNATIONAL ISO
STANDARD 3211
Fourth edition
2018-11
Anodizing of aluminium and its
alloys — Assessment of resistance of
anodic oxidation coatings to cracking
by deformation
Anodisation de l'aluminium et de ses alliages — Évaluation de la
résistance des couches anodiques à la formation de criques par
déformation
Reference number
ISO 3211:2018(E)
©
ISO 2018
ISO 3211:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 3211:2018(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Test specimen . 2
6.1 Sampling . 2
6.2 Size . 2
6.3 Treatment before testing . 2
7 Procedure. 4
8 Expression of results . 5
9 Test report . 5
Bibliography . 6
ISO 3211:2018(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
b
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