EN ISO 28706-3:2011

SLOVENSKI STANDARD
01-januar-2012
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Vitreous and porcelain enamels - Determination of resistance to chemical corrosion -
Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a
hexagonal vessel (ISO 28706-3:2008)
Emails und Emaillierungen - Bestimmung der Beständigkeit gegen chemische Korrosion
- Teil 3: Bestimmung der Beständigkeit gegen chemische Korrosion durch alkalische
Flüssigkeiten unter Verwendung eines Gerätes mit hexagonalem Gefäß (ISO 28706-
3:2008)
Émaux vitrifiés - Détermination de la résistance à la corrosion chimique - Partie 3:
Détermination de la résistance à la corrosion chimique par des liquides alcalins dans un
récipient hexagonal (ISO 28706-3:2008)
Ta slovenski standard je istoveten z: EN ISO 28706-3:2011
ICS:
25.220.50 Emajlne prevleke Enamels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 28706-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2011
ICS 25.220.50 Supersedes EN 14483-3:2004
English Version
Vitreous and porcelain enamels - Determination of resistance to
chemical corrosion - Part 3: Determination of resistance to
chemical corrosion by alkaline liquids using a hexagonal vessel
(ISO 28706-3:2008)
Émaux vitrifiés - Détermination de la résistance à la Emails und Emaillierungen - Bestimmung der Beständigkeit
corrosion chimique - Partie 3: Détermination de la gegen chemische Korrosion - Teil 3: Bestimmung der
résistance à la corrosion chimique par des liquides alcalins Beständigkeit gegen chemische Korrosion durch alkalische
dans un récipient hexagonal (ISO 28706-3:2008) Flüssigkeiten unter Verwendung eines Gerätes mit
hexagonalem Gefäß (ISO 28706-3:2008)
This European Standard was approved by CEN on 15 April 2011.

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, 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
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 28706-3:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 28706-3:2008 has been prepared by Technical Committee ISO/TC 107 “Metallic and other
inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over as EN
ISO 28706-3:2011 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the
secretariat of which is held by BSI.
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 November 2011, and conflicting national standards shall be withdrawn
at the latest by November 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 14483-3:2004.
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 28706-3:2008 has been approved by CEN as a EN ISO 28706-3:2011 without any
modification.
INTERNATIONAL ISO
STANDARD 28706-3
First edition
2008-12-01
Vitreous and porcelain enamels —
Determination of resistance to chemical
corrosion —
Part 3:
Determination of resistance to chemical
corrosion by alkaline liquids using a
hexagonal vessel
Émaux vitrifiés — Détermination de la résistance à la corrosion
chimique —
Partie 3: Détermination de la résistance à la corrosion chimique par des
liquides alcalins dans un récipient hexagonal

Reference number
ISO 28706-3:2008(E)
©
ISO 2008
ISO 28706-3:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 28706-3:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Principle. 1
4 Reagents. 2
5 Apparatus and materials. 2
6 Test specimens. 7
7 Procedure. 7
8 Expression of results. 7
9 Standard detergent solution test . 8
9.1 General. 8
9.2 Test solution. 8
9.3 Test temperature. 8
9.4 Duration of the test. 8
9.5 Test report. 9
10 Other test solutions and/or conditions. 9
10.1 General. 9
10.2 Test solution. 9
10.3 Test temperature. 9
10.4 Duration of the test. 9
10.5 Test report. 10

ISO 28706-3:2008(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 ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 28706-3 was prepared by the European Committee for Standardization (CEN) (as EN 14483-3) and was
adopted, under a special “fast-track procedure”, by Technical Committee ISO/TC 107, Metallic and other
inorganic coatings, in parallel with its approval by the ISO member bodies.
It cancels and replaces ISO 4533:1983 and ISO 4535:1983, which have been technically revised.
ISO 28706 consists of the following parts, under the general title Vitreous and porcelain enamels —
Determination of resistance to chemical corrosion:
⎯ Part 1: Determination of resistance to chemical corrosion by acids at room temperature
⎯ Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or
their vapours
⎯ Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel
⎯ Part 4: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vessel
⎯ Part 5: Determination of resistance to chemical corrosion in closed systems
iv © ISO 2008 – All rights reserved

ISO 28706-3:2008(E)
Introduction
Corrosion of vitreous and porcelain enamels by aqueous solutions is a dissolution process. The main
component of the enamel, SiO , forms a three-dimensional silica network. After hydrolysis, it decomposes and
forms silicic acid or silicates. These are released into the attacking medium. Other components, mainly metal
oxides, are hydrolysed as well and form the corresponding hydrated metal ions or hydroxides. All corrosion
products are more or less soluble in the attacking medium. The whole process results in a loss in mass per
unit area.
For some aqueous solutions, the attack on the enamel proceeds linearly during the corrosion time; for other
aqueous solutions, the attack on the enamel proceeds in a logarithmic manner during the corrosion time. Only
for the first series of solutions can a scientifically exact rate of loss in mass per unit area (g/m⋅h) be
calculated as well as a corrosion rate (mm/year).
The most important parameters influencing aqueous corrosion of the enamel are the enamel quality,
...