ENV ISO 8502-1:1999

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 (ISO/TR 8502-1:1991)

This TR describes a field test for the assessment of soluble iron corrosion products on surfaces abrasively blast-cleaned to Sa 2 1/2 or better.

Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen - Prüfungen der Oberflächenreinheit - Teil 1: Feldprüfung auf lösliche Korrosionsprodukte des Eisens (ISO/TR 8502-1:1991)

Dieser Fachbericht beschreibt eine Feldprüfung zum Bestimmen löslicher Korrosionsprodukte des Eisens auf Oberflächen, die bis zum Vorbereitungsgrad Sa 2 1/2 oder besser gestrahlt sind (siehe ISO 8501-1 oder ISO 8501-2). Für die Prüfung wird Indikatorpapier verwendet, das auf Eisen(II)-lonen anspricht. Diese Feldprüfung ist nicht bei Stahloberflächen geeignet, die von Hand gereinigt sind.

Préparation des subjectiles d'acier avant application de peintures et de produits assimilés - Essais pour apprécier la propreté d'une surface - Partie 1: Essai in situ pour déterminer les produits de corrosion du fer (ISO/TR 8502-1:1991)

Priprava jeklenih podlag pred nanašanjem barvnih in sorodnih premazov - Preskusi ugotavljanja čistoče podlage - 1. del: Preskus prisotnosti topnih korozijskih produktov železa na delovišču (ISO/TR 8502-1:1991)

General Information

• Status: Withdrawn
• Publication Date: 20-Jul-1999
• Withdrawal Date: 18-May-2004
• ICS: 87.020 - Paint coating processes
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 19-May-2004
• Completion Date: 19-May-2004
• Ref Project: SIST ENV ISO 8502-1:2000 - 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 (ISO/TR 8502-1:1991)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ENV ISO 8502-1:2000
01-april-2000
3ULSUDYDMHNOHQLKSRGODJSUHGQDQDãDQMHPEDUYQLKLQVRURGQLKSUHPD]RY
3UHVNXVLXJRWDYOMDQMDþLVWRþHSRGODJHGHO3UHVNXVSULVRWQRVWLWRSQLK
NRUR]LMVNLKSURGXNWRYåHOH]DQDGHORYLãþX,6275
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 (ISO/TR 8502-1:1991)
Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen -
Prüfungen der Oberflächenreinheit - Teil 1: Feldprüfung auf lösliche Korrosionsprodukte
des Eisens (ISO/TR 8502-1:1991)
Préparation des subjectiles d'acier avant application de peintures et de produits
assimilés - Essais pour apprécier la propreté d'une surface - Partie 1: Essai in situ pour
déterminer les produits de corrosion du fer (ISO/TR 8502-1:1991)
Ta slovenski standard je istoveten z: ENV ISO 8502-1:1999
ICS:
25.220.10 Priprava površine Surface preparation
SIST ENV ISO 8502-1:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ENV ISO 8502-1:2000

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SIST ENV ISO 8502-1:2000

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SIST ENV ISO 8502-1:2000

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SIST ENV ISO 8502-1:2000

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SIST ENV ISO 8502-1:2000

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SIST ENV ISO 8502-1:2000
TECHNICAL
TR 8502-I
REPORT
First edition
1991-10-15
-____I_--- -.-----_--A----.--
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
Preparation des subjectiles d’acier avant application de peintures et de
produits assimik - Essais pour apprkcier la propret d’une surface -
Partie 1: Essai in situ pour d@terminer les produits de corrosion du fer
------ .- -~
--- ----
- .--
Reference number
-_-- ---. .-
------------_- -- lSO/TR 8502-l : 1991 (E)
_. - - ._ _

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SIST ENV ISO 8502-1:2000
ISO/TR 8502-l :1991 (E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
The main task of technical committees is to prepare International Stan-
dards, but in exceptional circumstances a technical committee may
propose the publication of a Technical Report of one of the following
types:
- type1,w hen the required support cannot b e obtained for the publi-
cation of an I nter ,national Standard
despite repeated e fforts;
9
- type 2, when the subject is still under technical development or
where for any other reason there is the future but not immediate
possibility of an agreement on an International Standard;
- type 3, when a technical committee has collected data of a different
kind from that which is normally published as an International Stan-
dard (“state of the art”, for example).
Technical Reports of types 1 and 2 are subject to review within three
years of publication, to decide whether they car! be transformed into
International Standards. Technical Reports of type 3 do not necessarily
have to be reviewed until the data they provide are considered to be no
longer valid or useful.
ISO/TR 85024, which is a Technical Report of type 2, was prepared by
Technical Committee ISO/TC 35, Paints and varnishes.
The reasons which led to the decision to publish this document in the
form of a type 2 Technical Report are explained in the Introduction.
0 is0 1991
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, Including photocopying and microfilm, without
permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-321 1 Geneve 20 l Switz erland
Printed in Switzerland
ii

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SIST ENV ISO 8502-1:2000
ISO/TR 85024:1991(E)
IS0 8502 consists of the following parts, under the general title Prep-
aration of steel substrates before application of paints and related prod-
ucts - Tests for the assessment of surface cleanliness:
-
Part 1: Field test for s&b/e iron corrosion products
[Technical Report]
-
Fart 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
Annex A of this part of IS0 8502 is for information only.

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SIST ENV ISO 8502-1:2000
ISO/TR 8502-l :1991 (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;
the prese nce of surface contaminants, including salts, dust, oils and
W
greases;
c) the surface profile.
International Standards IS0 8501, IS0 8502 and IS0 8503 have been
prepared to provide methods of assessing these factors, while IS0 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 systems 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 influ-
ence on the choice of protective coating to be applied and on its per-
formance. 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 follow-
ing aspects of preparation of steel substrates:
IS0 8501
- Visual assessment of surface cleanliness;
IS0 8502 - Tests for the assessment of surface cleanliness;
IS0 8503 - Surface roughness characteristics of blast-cleaned steel
substrates;
IS0 8504 - Surface preparation methods,
Each of these International Standards is in turn divided into separate
parts.
iv

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SIST ENV ISO 8502-1:2000
ISO/TR 85024:1991(E)
Rusted steel substrates, particularly of rust grades C or D (see
IS0 8501-l), even when blast-cleaned to preparation grade Sa 3 (see
IS0 8501-l and IS0 8501-2), may still be contaminated by soluble iron
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 large accumulations of rust
which destroy the adhesion between the substrate and the applied pro-
tective coating.
In surfaces cleaned to preparation grades lower than Sa 2X, it is likely
that soluble iron corrosion products will be concealed under layers of
iron oxide and will not be detectable until further cleaning is carried out.
In the field, it is difficult to determine accurately the concentration of
soluble salts on the substrate present after blast-cleaning. Nevertheless,
because a procedure is required for detecting and estimating soluble
iron salts, one is described in this type 2 Technical Report. It is given
as an aid and is not, at this stage, to be considered as an International
Standard, as further experience needs to be gained with the method.
In addition to the procedure described in this Technical Report, other
methods of detecting soluble salts are in use, and some of these are
described briefly in annex A with a commentary on their advantages
and limitations.
Using the swabbing procedures described in clause 5, it has been esti-
mated that the surface concentration detectable is of the order of
10 mg/m* of iron ions. In practical use, there are indications that re-
sults obtained in the field of less than 15 mg/m* are probably insignifi-
cant for most coating purposes, but that results of the order of
250 mg/m* indicate that it would be undesirable to paint the surface,
except if the coated structure is to be maintained in the very driest ex-
posure conditions. Surfaces indicating this latter level of contamination
will also generally rapidly re-rust after blast-cleaning in relative hu-
midities above 50 %.
NOTE 1 After rrying out the te st, it is advisable to further cl ean the test
area to remove sh rus ting befo re application of a paint system.
It is important, when specifying the maximum permissible amount of
surface contamination by soluble iron corrosion products, to avoid im-
posing unnecessarily strict limits. Lower limits are appropriate only to
marine or similar aggressive environments. A requirement for excess-
ively low contamination levels can be very costly and, in many rural and
non-industrial inland areas, would be disproportionate to the benefits to
be obtained.

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SIST ENV ISO 8502-1:2000
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SIST ENV ISO 8502-1:2000
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TECHNICAL REPORT ISO/TR 8502-1:1991(E)
Preparation of steel substrates before application of paints
a
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