Anodizing of aluminium and its alloys - Rating system for the evaluation of pitting corrosion - Grid method (ISO 8994:2018)

This document specifies a grid rating system that provides a means of defining levels of performance of
anodic oxidation coatings on aluminium and its alloys that have been subjected to corrosion tests.
This rating system is applicable to pitting corrosion resulting from
— accelerated tests,
— exposure to corrosive environments, and
— practical service tests.
This document takes into account only pitting corrosion of the basis metal resulting from penetration
of the protective anodic oxidation coating.
NOTE 1 ISO 8993[1] describes a similar rating system based on defined chart scales.
NOTE 2 The grid rating system is frequently used for rating the results of short-term corrosion tests for
relatively thin anodic oxidation coating, such as those used in the automotive industry.

Anodisieren von Aluminium und Aluminiumlegierungen - Bewertungssystem für Lochkorrosion - Rasterzählmethode (ISO 8994:2018)

Anodisation de l'aluminium et de ses alliages - Système de cotation de la corrosion par piqûres - Méthode par quadrillage (ISO 8994:2018)

Le présent document spécifie un système de cotation par quadrillage qui permet de définir des niveaux de performance des couches anodiques déposées sur l'aluminium et ses alliages, soumises à des essais de corrosion.
Ce système de cotation s'applique à la corrosion par piqûres résultant
— d'essais accélérés,
— de l'exposition à des milieux corrosifs, et
— d'essais en service.
Le présent document ne tient compte que de la corrosion par piqûres du métal de base résultant de la pénétration de la couche anodique de protection.
NOTE 1 L'ISO 8993[1] décrit un système de cotation similaire fondé sur la méthode des échelles graduées (images types).
NOTE 2 Le système de cotation par quadrillage est souvent utilisé pour la classification des résultats d'essais de corrosion de courte durée pour des couches anodiques relativement fines, telles que celles utilisées dans l'industrie automobile.

Anodizacija aluminija in njegovih zlitin - Ocenjevalni sistem za vrednotenje jamičaste korozije - Rastrska metoda (ISO 8994:2018)

Ta dokument določa rastrski ocenjevalni sistem, ki omogoča opredelitev ravni učinkovitosti anodno oksidiranih prevlek na aluminiju in aluminijevih zlitinah, ki so bile preskušene glede odpornosti proti koroziji.
Ta ocenjevalni sistem se uporablja za jamičasto korozijo, ki nastane kot posledica
– pospešenih preskusov,
– izpostavljenosti v korozivnem okolju in
– praktičnih delovnih preskusov.
Ta dokument obravnava samo jamičasto korozijo osnovne kovine, ki je posledica prodiranja zaščitne anodno oksidirane prevleke.
OPOMBA 1: Standard ISO 8993[1] opisuje podoben ocenjevalni sistem, ki temelji na grafičnih lestvicah.
OPOMBA 2: Rastrski ocenjevalni sistem se pogosto uporablja za ocenjevanje rezultatov kratkoročnih preskusov korozije za relativno tanke anodizirane plasti, kot so tiste, ki se uporabljajo v avtomobilski industriji.

General Information

Status
Published
Public Enquiry End Date
14-Feb-2018
Publication Date
30-Jan-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
15-Jan-2019
Due Date
22-Mar-2019
Completion Date
31-Jan-2019

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SIST EN ISO 8994:2019
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Anodizing of aluminium and its alloys - Rating system for the evaluation of pitting

corrosion - Grid method (ISO 8994:2018)
Anodisieren von Aluminium und Aluminiumlegierungen - Bewertungssystem für
Lochkorrosion - Rasterzählmethode (ISO 8994:2018)

Anodisation de l'aluminium et de ses alliages - Système de cotation de la corrosion par

piqûres - Méthode par quadrillage (ISO 8994:2018)
Ta slovenski standard je istoveten z: EN ISO 8994:2018
ICS:
25.220.20 Površinska obdelava Surface treatment
77.120.10 Aluminij in aluminijeve zlitine Aluminium and aluminium
alloys
SIST EN ISO 8994:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8994:2019
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SIST EN ISO 8994:2019
EN ISO 8994
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 25.220.20; 77.060 Supersedes EN ISO 8994:2011
English Version
Anodizing of aluminium and its alloys - Rating system for
the evaluation of pitting corrosion - Grid method (ISO
8994:2018)

Anodisation de l'aluminium et de ses alliages - Système Anodisieren von Aluminium und

de cotation de la corrosion par piqûres - Méthode par Aluminiumlegierungen - Bewertungs-system für

quadrillage (ISO 8994:2018) Lochkorrosion - Rasterzählmethode (ISO 8994:2018)
This European Standard was approved by CEN on 11 December 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 8994:2018 E

worldwide for CEN national Members.
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SIST EN ISO 8994:2019
EN ISO 8994:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 8994:2019
EN ISO 8994:2018 (E)
European foreword

This document (EN ISO 8994:2018) 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 8994:2011.

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 8994:2018 has been approved by CEN as EN ISO 8994:2018 without any modification.

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SIST EN ISO 8994:2019
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SIST EN ISO 8994:2019
INTERNATIONAL ISO
STANDARD 8994
Third edition
2018-11
Anodizing of aluminium and its
alloys — Rating system for the
evaluation of pitting corrosion —
Grid method
Anodisation de l'aluminium et de ses alliages — Système de cotation
de la corrosion par piqûres — Méthode par quadrillage
Reference number
ISO 8994:2018(E)
ISO 2018
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SIST EN ISO 8994:2019
ISO 8994:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© 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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 8994:2019
ISO 8994:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Procedure for rating ......................................................................................................................................................................................... 2

4.1 Preparation of test specimen ...................................................................................................................................................... 2

4.2 Determination of grid rating number ................................................................................................................................. 2

5 Expression of results ........................................................................................................................................................................................ 3

6 Test report ................................................................................................................................................................................................................... 3

Bibliography ................................................................................................................................................................................................................................ 4

© ISO 2018 – All rights reserved iii
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SIST EN ISO 8994:2019
ISO 8994:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through
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