SIST EN ISO 8502-12:2005

SLOVENSKI STANDARD
01-april-2005
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Preparation of steel substrates before application of paints and related products - Tests
for the assessment of surface cleanliness - Part 12: Field method for the titrimetric
determination of water-soluble ferrous ions (ISO 8502-12:2003)
Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen -
Prüfungen zur Bewertung der Oberflächenreinheit - Teil 12: Feldprüfung zur
titrimetrischen Bestimmung von wasserlöslichen Eisenionen (ISO 8502-12:2003)
Préparation des subjectiles d'acier avant application de peintures et de produits
assimilés - Essais pour apprécier la propreté d'une surface - Partie 12: Méthode in situ
pour la détermination titrimétrique des ions ferreux hydrosolubles (ISO 8502-12:2003)
Ta slovenski standard je istoveten z: EN ISO 8502-12:2004
ICS:
25.220.10 Priprava površine Surface preparation
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 8502-12
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 25.220.10
English version
Preparation of steel substrates before application of paints and
related products - Tests for the assessment of surface
cleanliness - Part 12: Field method for the titrimetric
determination of water-soluble ferrous ions (ISO 8502-12:2003)
Préparation des subjectiles d'acier avant application de Vorbereitung von Stahloberflächen vor dem Auftragen von
peintures et de produits assimilés - Essais pour apprécier Beschichtungsstoffen - Prüfungen zur Bewertung der
la propreté d'une surface - Partie 12: Méthode in situ pour Oberflächenreinheit - Teil 12: Feldprüfung zur
la détermination titrimétrique des ions ferreux hydrosolubles titrimetrischen Bestimmung von wasserlöslichen
(ISO 8502-12:2003) Eisenionen (ISO 8502-12:2003)
This European Standard was approved by CEN on 21 December 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8502-12:2004: E
worldwide for CEN national Members.

Foreword
The text of ISO 8502-12:2003 has been prepared by Technical Committee ISO/TC 35 "Paints
and varnishes” of the International Organization for Standardization (ISO) and has been taken
over as EN ISO 8502-12:2004 by Technical Committee CEN/TC 139 "Paints and varnishes", the
secretariat of which is held by DIN.

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 2005, and conflicting national
standards shall be withdrawn at the latest by June 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 8502-12:2003 has been approved by CEN as EN ISO 8502-12:2004 without any
modifications.
INTERNATIONAL ISO
STANDARD 8502-12
First edition
2003-02-15
Preparation of steel substrates before
application of paints and related
products — Tests for the assessment of
surface cleanliness —
Part 12:
Field method for the titrimetric
determination of water-soluble ferrous ions
Préparation des subjectiles d'acier avant application de peintures et de
produits assimilés — Essais pour apprécier la propreté d'une surface —
Partie 12: Méthode in situ pour la détermination des ions ferreux
hydrosolubles par titrimétrie
Reference number
ISO 8502-12:2003(E)
©
ISO 2003
ISO 8502-12:2003(E)
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ii © ISO 2003 – All rights reserved

ISO 8502-12:2003(E)
Contents Page
Foreword . iv
Introduction. v
1 Scope. 1
2 Normative references. 1
3 Principle . 1
4 Reagents . 2
5 Apparatus. 2
6 Removal of water-soluble contaminants from the surface. 2
7 Procedure. 2
8 Expression of results. 3
9 Precision . 3
10 Test report. 3

ISO 8502-12:2003(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 3.
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 part of ISO 8502 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 8502-12 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 12,
Preparation of steel substrates before application of paints and related products.
ISO 8502 consists of the following parts, under the general title Preparation of steel substrates before application of
paints and related products — Tests for the assessment of surface cleanliness:
 Part 1: Field test for soluble iron corrosion products
[Technical Report]
 Part 2: Laboratory determination of chloride on cleaned surfaces
 Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method)
 Part 4: Guidance on the estimation of the probability of condensation prior to paint application
 Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method)
 Part 6: Extraction of soluble contaminants for analysis — The Bresle method
 Part 7: Field method for the determination of oil and grease
 Part 8: Field method for the refractometric determination of moisture
 Part 9: Field method for the conductometric determination of water-soluble salts
 Part 10: Field method for the titrimetric determination of water-soluble chloride
 Part 11: Field method for the turbidimetric determination of water-soluble sulfate
 Part 12: Field method for the titrimetric determination of water-soluble ferrous ions
 Part 13: Field method for the determination of soluble salts by conductometric measurement
At the time of publication of this part of ISO 8502, parts 7, 11 and 13 were in preparation.
iv © ISO 2003 – All rights reserved

ISO 8502-12:2003(E)
Introduction
The performance of protective coatings of paint and related products applied to steel is significantly affected by the
state of the steel surface immediately prior to painting. The principal factors that are known to influence this
performance are:
a) the presence of rust and mill scale;
b) the presence of surface contaminants, including salts, dust, oils and greases;
c) the surface profile.
International Standards ISO 8501, ISO 8502 and ISO 8503 have been prepared to provide methods of assessing
these factors, while ISO 8504 provides guidance on the preparation methods that are available for cleaning steel
substrates, indicating the capabilities of each in attaining specified levels of cleanliness.
These International Standards do not contain recommendations for the protective coating system to be applied to
the steel surface. Neither do they contain recommendations for the surface quality requirements for specific
situations even though surface quality can have direct influence on the choice of protective coating to be applied
and on its performance. Such recommendations are found in other documents such as national standards and
codes of practice. It will be necessary for the users of these International Standards to ensure that qualities
specified are:
 compatible and appropriate both for the environmental conditions to which the steel will be exposed and for the
protective coating system to be used;
 within the capability of the cleaning procedure specified.
The four International Standards referred to above deal with the following aspects of preparation of steel
substrates:
ISO 8501 — Visual assessment of surface cleanliness;
ISO 8502 — Tests for the assessment of surface cleanliness;
ISO 8503 — Surface roughness characteristics of blast-cleaned steel substrates;
ISO 8504 — Surface preparation methods.
Each of these International Standards is in turn divided into separate parts.
There are a number of methods for the analysis of ferrous ions in solution. However, most of these are for
laboratory use and very few are suitable for field use, i.e. in conjunction with sampling in workshops, at building
sites, on board ships, etc., often under severe environmental conditions.
The proposed field method for ferrous ions and the corresponding methods of analysis that have been developed
for other contaminants (such as sulfate, chlorides, and oil and grease) are intended to be used in conjunction with
the Bresle method for the removal of contaminants from a surface, ISO 8502-6
...