BRITISH STANDARD BS EN ISO
8502-9:2001
BS 7079-B9:1998
Incorporating
Amendment No. 1
Preparation of steel
substrates before
application of paints
and related products —
Group B: Methods for the assessment of
surface cleanliness —
Part B9: Field method for the
conductometric determination of
water-soluble salts
ICS 17.040.20; 25.22.10; 87.020
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
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BS EN ISO 8502-9:2001
This British Standard, having
been prepared under the
direction of the Sector Board
for Materials and Chemicals,
was published under the
authority of the Standards
Board and comes into effect on
15 August 1998
© BSI 06-2001
ISBN 0 580 30219 9
National foreword
This British Standard is the official English language version of
EN ISO 8502-9:2000, Preparation of steel substrates before application of paints
and related products — Tests for the assessment of surface of cleanliness —
Part 9: Field method for the conductometric determination of water-soluble
salts, including amendment A1:2000, and implements it as the UK national
standard. It reproduces verbatim ISO 8502-9:1998. The original BS identifier
BS 7079-B9:1998 has been retained for ease of cross-reference.
The UK participation in its preparation was entrusted to Technical Committee
STI/21, Surface preparation of steel, which has the responsibility to:
— aid enquirers to understand the text;
— present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep the UK
interests informed;
— monitor related international and European developments and
promulgate them in the UK.
A list of organizations represented on this committee can be obtained on
request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Standards
Catalogue under the section entitled “International Standards Correspondence
Index”, or by using the “Find” facility of the BSI Standards Electronic
Catalogue.
A British Standard does not purport to include all the necessary provisions of
a contract. Users of British Standards are responsible for their correct
application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii, the
EN title page, the EN foreword page, the ISO title page, the ISO foreword page,
pages 1 to 4, an inside back cover and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.
Sidelining in this document indicates the most recent changes by amendment.
Amendments issued since publication
Amd. No. Date Comments
12095 June 2001 Indicated by a sideline
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BS EN ISO 8502-9:2001
© BSI 06-2001 i
Contents
Page
National foreword Inside front cover
Introduction 1
1 Scope 1
2 Normative references 1
3 Principle 2
4 Solvent 2
5 Apparatus and materials 2
6 Procedure 2
7 Expression of results 3
8 Accuracy 5
9 Text report 5
Figure 1 — The total surface density �A of the salts as a function
of the change in conductivity �� 4
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ii blank
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EUROPEAN STANDARD
NORME EUROPÉEENNE
EUROPÄISCHE NORM
EN ISO 8502-9
August 2000
+ A1
December 2000
ICS 87.020
Emglish version
Preparation of steel substrates before application of paints
and related products — Tests for the assessment of surface
cleanliness —
Part 9: Field method for the conductometric determination
of water-soluble salts
(ISO 8502-9:1998 + A1:2000)
Préparation des subjectiles d’acier avant application
de peintures et de produits assimilés —
Essais pour apprécier la propreté d’une surface —
Partie 9: Méthode in situ pour la détermination des
sels solubles dans l’eau par conductimétrie
(ISO 8502-9:1998 + A1:2000)
This European Standard was approved by CEN on 6 August 2000.
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, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
United Kingdom.
CEN
European Committee for Standardization
Comité Européen de Normalisation
Europäisches Komitee für Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
© 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
Members.
Ref. No. EN ISO 8502-9:2000 + A1:2000 E
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EN ISO 8502-9:2000
© BSI 06-2001
Foreword
The text of the International Standard from
Technical Committee ISO/TC 35, Paints and
varnishes, of the International Organization for
Standardization (ISO), including amendment
A1:2000; has been taken over as a European
Standard 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
February 2001, and conflicting national standards
shall be withdrawn at the latest by February 2001.
According to the CEN/CENELEC Internal
Regulations, the national standards organizations
of the following countries are bound to implement
this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany,
Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.
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Amendment 1
1999-12-02
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EN ISO 8502-9:2000
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.
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.
International Standard ISO 8502-9 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 determination of oil and grease ;
— Part 8: Field method for 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 chloride.
Descriptors: Paints, varnishes, substrates, steel products, tests, field tests, determination, surface
condition, cleanliness checks, conductimetric methods.
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EN ISO 8502-9:2000
© BSI 06-2001 1
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 a 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 the 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.
This part of ISO 8502 describes a field method for the assessment of the total amount of water-soluble salts,
the salts being regarded as forming one single contaminant. The more aggressive contaminants causing
corrosion and blistering (the ionic species) can easily be dissolved off and determined rapidly by this
method. Consequently, the less aggressive and not so easily dissolved minor part of contaminant will
remain un-assessed. For additional information on the test method, its potential and its limitations, see
BRESLE, Å., Conductometric determination of salts on steel surfaces, MP (Materials Performance),
June 1995, Vol. 34, No. 6, pp. 35-37, NACE International, Houston TX, USA.
Rusty steel substrates, particularly those of rust grades C or D (see ISO 8501-1), even when
blast-cleaned to preparation grade Sa 3 (see ISO 8501-1 and ISO 8501-2), may still be contaminated by
water-soluble salts and corrosion products. These compounds are almost colourless and are localized at the
lowest point of the rust pits. If they are not removed prior to painting, chemical reactions can result in
blister formation and accumulations of rust that destroy the adhesion between the substrate and the
applied protective coating.
1 Scope
This part of ISO 8502 describes a field method for the assessment of the total surface density of various
water-soluble salts (mostly chlorides and sulfates) on steel surfaces before and/or after surface preparation.
The individual surface densities of chlorides, sulfates, etc., cannot be determined by this method.
This method assesses ionic contaminants only. These represent the greater part of the contamination.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of
this part of ISO 8502. At the time of publication, the editions indicated were valid. All standards are subject
to revision, and parties to agreement based on this part of ISO 8502 are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO
maintain registers of currently valid International Standards.
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EN ISO 8502-9:2000
2 © BSI 06-2001
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
ISO 8502-6:1995, Preparation of steel substrates before application of paints and related products — Tests
for the assessment of surface cleanliness — Part 6: Extraction of soluble contaminants for analysis — The
Bresle method
3 Principle
The salts on the given area of the steel surface are dissolved by the Bresle method (see ISO 8502-6), using
water as solvent. The conductivity of the solution thus obtained is measured. Finally, the total surface
density of the salts in this area is calculated by a simple but sufficiently accurate equation.
4 Solvent
Water of at least grade 3 purity in accordance with ISO 3696.
NOTE Usually, distilled or de-ionized water of conductivity less than 0,5 mS/m (5 �S/cm) meets this requirement.
5 Apparatus and materials
5.1 Conductometer, with temperature compensation and sufficient range, e.g. from 0 mS/m (0 �S/cm)
to 200 mS/m (2 000 �S/cm).
5.2 Glass beaker, of convenient size and shape for housing the electrode end of the conductometer (5.1)
during measurement.
5.3 Standard adhesive patch, as specified in 4.1 of ISO 8502-6:1995, e.g. of size A-1250.
NOTE The patch should not cause any noticable contamination of the extraction liquid. Certain patches are available today which
are guaranteed to cause an ionic contamination of less than 7 mg/m2, which is generally satisfactory. If there is no guarantee or if
improved accuracy is required, then a blank test is recommended.
5.4 Syringe, as specified in 4.2 of ISO 8502-6:1995.
6 Procedure
6.1 Preparation of water and blank test
6.1.1 Pour into the beaker (5.2) an amount of water (clause 4) that is just large enough for the operation of
the conductometer (5.1). Usually a volume between 10 ml and 20 ml is needed. To prevent foreign matter
inside the beaker and syringe, and on the conductometer probe, from influencing the result, carry out the
following blank test.
6.1.2 Completely fill the syringe (5.4) with water from the beaker. Then empty the syringe back into the
beaker.
6.1.3 Immerse the electrodes of the conductometer fully in the water in the beaker and agitate gently.
Record the conductivity (�1) and the units in which it is expressed, for example �S/cm.
6.2 Removal of salts from the steel surface
6.2.1 Follow the procedure specified in clause 5 of ISO 8502-6:1995, subject to the following specific
requirements.
6.2.2 Fill the syringe with about one-quarter of the water contained in the beaker.
6.2.3 After 1 min, suck the water back into the syringe cylinder (see 5.6 of ISO 8502-6:1995).
6.2.4 Without removing the syringe needle from the patch, re-inject the water into the patch compartment
and then suck the water back into the syringe cylinder. Repeat until 10 cycles of injection and sucking have
been completed (see 5.7 of ISO 8502-6:1995).
6.2.5 At the end of the 10th cycle, retrieve as much as possible of the water from the patch compartment
and transfer to the beaker (5.2), thus restoring its content to nearly the original volume in 6.1.1 (see 5.8
of 8502-6:1995).
6.3 Conductometric measurement
Immerse the electrodes of the conductometer fully in the now contaminated water in the beaker, and record
the conductivity (�2) expressed in the same units as in 6.1.3.
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EN ISO 8502-9:2000
© BSI 06-2001 3
7 Expression of results
The total surface density �A of the salts is given by the equation:
where
In this case, m is given by
...(1)
m is the mass of salts dissolved from that part of the surface which is covered by the patch
compartment;
A is the area of that part of the surface.
m = c. V. �� ...(2)
where
c is an empirical constant approximately equal to 5 kg�m–2�S–1 (see also clause 8);
V is the original volume of water in the beaker (see 6.1.1);
�� is the change in conductivity, i.e. the difference between the conductivity measured in 6.3 (�2) and
the conductivity measured in 6.1.3 (�1).
�A
m
A
-----=
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EN ISO 8502-9:2000
4 © BSI 06-2001
Each straight line corresponds to a different volume of water in the beaker. In each case, the patch size is A-1250, in accordance
with ISO 8502-6
Figure 1 — The total surface density �A of the salts as a function of
the change in conductivity ��
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EN ISO 8502-9:2000
© B
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