Metallic and other non-organic coatings - Sulfur dioxide test with general condensation of moisture (ISO 6988:1985)

Specifies a method for assessing the resistance of materials or products to condensed moisture containing sulfur dioxids. The method has been found to be suitable for testing metallic and non-organic coatings. Gives apparatus and material, test specimens, methods of exposure, procedure, test duration, cleaning of specimens, evaluation of results and test report.

Metallische und andere anorganische Überzüge - Prüfung mit Schwefeldioxid unter allgemeiner Feuchtigkeitskondensation (ISO 6988:1985)

Diese Internationale Norm legt ein Verfahren zur Beurteilung der Beständigkeit von Werkstoffen oder Gegenständen gegnüber kondensierter, schwefeldioxidhaltiger Feuchtigkeit fest. Es hat sich gezeigt, dass dieses Verfahren zur Prüfung metallischer und anorganischer Überzüge geeignet ist.

Revetements métalliques et autres revetements non organiques - Essai de soufre avec condensation générale de l'humidité (ISO 6988:1985)

La présente Norme internationale spécifie une méthode d'estimation de la résistance de matériaux ou de produits à une atmosphère contenant de l'humidité condensée et du dioxyde de soufre. La méthode convient pour l'essai des revêtements métalliques et non organiques.
NOTE -- Pour l'essai des peintures et vernis, voir ISO 3231, Peintures et vernis -- Détermination de la résistance aux atmosphères humides contenant du dioxyde de soufre.

Kovinske in druge anorganske prevleke - Korozijski preskus s SO2 v prisotnosti vodne pare (ISO 6988:1985)

General Information

Status
Published
Publication Date
30-Sep-1999
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Oct-1999
Due Date
01-Oct-1999
Completion Date
01-Oct-1999

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SLOVENSKI STANDARD
SIST EN ISO 6988:1999
01-oktober-1999
Kovinske in druge anorganske prevleke - Korozijski preskus s SO2 v prisotnosti
vodne pare (ISO 6988:1985)

Metallic and other non-organic coatings - Sulfur dioxide test with general condensation of

moisture (ISO 6988:1985)
Metallische und andere anorganische Überzüge - Prüfung mit Schwefeldioxid unter
allgemeiner Feuchtigkeitskondensation (ISO 6988:1985)

Revetements métalliques et autres revetements non organiques - Essai de soufre avec

condensation générale de l'humidité (ISO 6988:1985)
Ta slovenski standard je istoveten z: EN ISO 6988:1994
ICS:
25.220.20 Površinska obdelava Surface treatment
25.220.40 Kovinske prevleke Metallic coatings
SIST EN ISO 6988:1999 en

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

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SIST EN ISO 6988:1999
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SIST EN ISO 6988:1999
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SIST EN ISO 6988:1999
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SIST EN ISO 6988:1999
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SIST EN ISO 6988:1999
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SIST EN ISO 6988:1999
International Standard

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEX~YHAPO~HAR OPrAHM3ALWlR fl0 CTAH~APTM3A~Mkl~ORGANISATlON INTERNATIONALE DE NORMALISATION

Metallic and other non-organic coatings - Sulfur dioxide
test with general condensation of moisture

Revetements m&af..iques et autres revetements non organiques - Essai au dioxyde de soufre avec condensation g&Grale de

l’humidith
First edition - 1985-02-01
Ref. No. ISO 6988-1985 (E)
w UDC 621.793 : 621.193.41

Descriptors : coatings, metal coatings, non organic coatings, tests, corrosion tests, test equipment, sulphur dick&.

Price based on 4 pages
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SIST EN ISO 6988:1999
Foreword

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

national Standards bodies (ISO member bedies). The work of preparing International

Standards is normally carried out through ISO technical committees. Esch 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.

Draft International Standards adopted by the technical committees are circulated to

the member bodies for approval before their acceptance as International Standards by

the ISO Council. They are approved in accordance with ISO procedures requiring at

least 75 % approval by the member bodies voting.
International Standard ISO 6988 was prepared by Technical Committee ISO/TC 107,
Metallic and o ther non-organic cos tings.
International Organkation for Standardkation, 1985
Printed in Switzerland
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SIST EN ISO 6988:1999
INTERNATIONALSTANDARD ISO 6988-1985 (E)
Metallic and other non-organic coatings - Sulfur dioxide
test with general condensation of moisture
0 Introduction 3 Apparatus and material

0.1 Moist air containing Sulfur dioxide quickly produces 3.1 Test cabinet, of preferred capacity 300 + 10 dm3, with

easily visible corrosion of many metals in a form resembling a door capable of being closed hermetically, and fitted with the

that occurring in industrial environments. lt is therefore a test
components specified in 3.2, 3.3 and 3.4. Typical test cabinets

medium well suited to detect pores or other sources of are shown in figures 1 and 2.

weakness in protective coatings and deficiencies in corrosion
NOTE - Test cabinets of capacities other than 300 21 10 dm3 may be
resistance associated with unsuitable alloy composition or
used, provided that the other test conditions to which the test
treatments.
specimens are submitted are the Same. The details and instructions
given in this International Standard are, however, appropriate to test
The results obtained in the test should not be regarded as a
cabinets of the preferred capacity and will require corresponding
direct guide to the corrosion resistance of the tested materials
modifications for other capacities.
in all environments where these materials may be used. Simi-
larly, performances of different materials in the test should not
3.1 .l Materials of construction
be taken as a direct guide to the relative corrosion resistance of
these materials in Service.
All the materials used in the construction of the test cabinet
shall be resistant to the action of moist Sulfur dioxide and shall

0.2 The exposure conditions may be varied by either themselves not emit any gas or vapour likely to influence corro-

proceeding continuously or in cycles of alternate exposure to
sion of the test specimens.
the Sulfur dioxide-containing atmosphere and to the ambient
atmosphere.
The floor and lower Parts of the Walls shall be capable of being
heated and shall be able to retain without leakage at least
2,5 dm3 of water containing dissolved Sulfur dioxide, this
0.3 The variant of the test to be used, the test duration, the
volume being required to flush the apparatus. Lead-clad con-
type of test specimen and the criteria of failure are not specified
struction material is suitable for these Parts and for the
in this International Standard. Such details are provided in
framework and fittings of the cabinet, but the greater part of
appropriate material and product specifications.
the Walls and door should be made of transparent sheet, such
as glass or suitable plastics material.
1 Scope and field of application
A new cabinet shall be operated at least once, without in-
troduction of test specimens, following the procedure ap-
This International Standard specifies a method for assessing
plicable to an atmosphere containing 2 dm3 of Sulfur dioxide,
the resistance of materials or products to condensed moisture
before it is brought into use for testing. This should reduce
containing Sulfur dioxide.
risks of contamination of the atmosphere by vapours from the
materials of construction.
The method has been found to be suitable for testing metallic
and non-organic coatings.
3.1.2 Shape
NOTE - For testing paints and varnishes, see ISO 3231, Paints and
varnishes - Determination of resistance to humid atmospheres
Some Variation in the shape of the test cabinet tan be
con taining sulphur dioxide.
tolerated, but the roof should be shaped so that moisture con-
densing on it does not fall on test specimens in the test cabinet.
An inclination of the roof of about 12O to the horizontal pro-
2 References
vides a suitable safeguard.
ISO 1462, Metallic coatings - Coa tings o ther than those

anodic to the basis metal - Accelerated corrosion tests - 3.1.3 Ambient conditions

Method for the evaluation of the results.
The test cabinet shall be installed in a room in which there is a

ISO 4540, Metallic coatings - Coatings cathodic to the clean atmosphere and shall be protected from large or rapid

Substrate - Rating of electroplated fest specimens subjected temperature fluctuations, strong direct sunlight and draughts.

to corrosion tests. (See also 6.5.2.)
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SIST EN ISO 6988:1999
ISO 6988-1985 (El

3.2 Temperature-regulating device, with its actuating ele- 5 Method of exposure of test specimens

ment placed in the upper part of the test cabinet, and a ther-

mometer capable of being read from outside the cabinet with 5.1 Place the test specimens in the cabinet. The distance be-

its bulb 150 mm from the roof and door and 250 mm from a tween the test specimens shall be not less than 20 mm, the

distance between the test specimens and the Walls or roof of
side.
the test cabinet shall be not less than 100 mm. The distance
between the lower edges of the specimens and the surface of
3.3 Gas inlet tube, through which gas tan be introduced
the water in the base of the test cabinet shall be not less than
into the test cabinet, placed about 50 mm above the base, a
200 mm. The surface area of contact between a test specimen
valve, by which excess pressure tan be relieved, placed in or
and its
...

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