SIST EN ISO 4623:1997
(Main)Paints and varnishes - Filiform corrosion test on steel (ISO 4623:1984)
Paints and varnishes - Filiform corrosion test on steel (ISO 4623:1984)
This International Standard applies to composite station post insulators consisting of a load bearing cylindrical insulating solid core made of resin impregnated fibres, a housing (outside the insulating solid core) made of elastomer material (e.g. silicone or ethylene-propylene) and end fittings attached to the insulating core. Composite station post insulators covered by this standard are subjected to cantilever, torsion, tension and compression loads. They are intended for substations with a.c. voltages greater than 1 000 V up to 245 kV.
Lacke und Anstrichstoffe - Filiform-Korrosionsprüfung auf Stahl (ISO 4623:1984)
Diese Internationale Norm beschreibt ein Verfahren zur Feststellung der Schutzwirkung von Beschichtungen auf Stahl gegen Filiformkorrosion.
Peintures et vernis - Essai de corrosion filiforme sur acier (ISO 4623:1984)
La présente Norme internationale s'applique aux supports isolants composites rigides à socle constitués d'un noyau isolant plein cylindrique supportant les charges mécaniques réalisé en fibres imprégnées de résine, d'un revêtement (à l'extérieur du noyau plein isolant) réalisée en matériau élastomère (par exemple du silicone ou de l'éthylène-propylène) et des armatures d'extrémité fixées au noyau isolant. Les supports isolants composites rigides à socle relevant de la présente norme sont soumis aux charges de flexion, de torsion, de traction et de compression. Ils sont destinés aux postes à courant alternatif de tensions supérieures à 1 000 V jusqu'à 245 kV.
Barve in laki - Filiform korozijski preskus na jeklu (ISO 4623:1984)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 4623:1997
01-december-1997
Barve in laki - Filiform korozijski preskus na jeklu (ISO 4623:1984)
Paints and varnishes - Filiform corrosion test on steel (ISO 4623:1984)
Lacke und Anstrichstoffe - Filiform-Korrosionsprüfung auf Stahl (ISO 4623:1984)
Peintures et vernis - Essai de corrosion filiforme sur acier (ISO 4623:1984)
Ta slovenski standard je istoveten z: EN ISO 4623:1995
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 4623:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 4623:1997
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SIST EN ISO 4623:1997
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SIST EN ISO 4623:1997
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SIST EN ISO 4623:1997
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SIST EN ISO 4623:1997
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SIST EN ISO 4623:1997
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SIST EN ISO 4623:1997
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of developing International
Standards is carried out through IS0 technical committees. Every member body
interested in a subject for which a technical committee has been authorized 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 4623 was developed by Technical Committee ISO/TC 35,
Paints and varnishes, and was circulated to the member bodies in July 1982.
It has been approved by the member bodies of the following countries :
Australia
Iran South Africa, Rep. of
Canada
Iraq Sri Lanka
China
Israel Sweden
Czechoslovakia
Jamaica Switzerland
Egypt, Arab Rep. of Thailand
Kenya
France
Korea, Rep. of United Kingdom
Germany, F. R. Mexico
USSR
Hungary
Netherlands
India
Portugal
The member bodies of the fol lowing countries expressed disapprova I of the document
on technical grounds :
Belgium
Italy
International Organization for Standardization, 1984
0
Printed in Switzerland
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SIST EN ISO 4623:1997
IS0 4623-1984 (E)
INTERNATIONAL STANDARD
Paints and varnishes - Filiform corrosion test on steel
0 Introduction 2 References
This International Standard is one of a series of standards deal-
ISO/R 483, Plastics - Methods for maintaining constant
ing with the sampling and testing of paints, varnishes and relative humidity in small enclosures by means of aqueous solu-
related products. tions.
I SO 1512, Paints and varnishes - Sampling.
This International Standard describes a test procedure for
assessing the protective action of coatings of paints or var-
IS0 1513, Paints and varnishes - Examination and prepara tion
nishes on steel against filiform corrosion arising from a scribed
of samples for testing.
mark cut through the coating. This corrosion tends to develop
when the relative humidity is high and when traces of salts are
Standard panels for testing.
IS0 1514, Paints and varnishes -
present either under the paint coating or at breaks in the
coating. A certain amount of under-rusting of the substrate,
IS0 2409, Paints and varnishes - Cross-cut test.
starting from the scribed mark, will always occur. Filiform cor-
rosion, however, is considered to be present only if the typical
- Determination of fZm
I SO 2808, Paints and varnishes
pattern in the form of threads is obvious (see figure 2).
thickness.
For any particular application, the test method described in this Determination of resistance
IS0 7253, Paints and varnishes -
International Standard needs to be completed by the following
to neutral salt spray.
supplementary information. This information shall be derived,
in part or totally, from the (inter)national standard or other
3 Definition
document related to the product under test or, if appropriate,
should be agreed between the interested parties.
filiform corrosion : A type of corrosion proceeding under a
coat of paint, varnish or related product, in the form of threads,
a) Material and surface preparation of the substrate.
generally starting from bare edges or from local damage to the
coating.
b) Method of application of the test coating to the
substrate, including duration and conditions of drying be-
NOTE - Usually the threads are irregular in length and direction of
tween coats in the case of a multi-coat system. growth, but they may also be nearly parallel and of approximately equal
length. It should be noted that filiform corrosion can also occur under
other protective coatings.
c) Duration and conditions of drying of the coat (or con-
ditions of stoving and ageing, if applicable) before
testing.
4 Principle
Scribing of a mark on the coated test panel. Introduction of a
d) Thickness, in micrometres, of the dry coating and
small amount of sodium chloride into the scribed mark, either
method of measurement in accordance with IS0 2808, and
by dipping the panel in a solution of the salt or by exposure to
whether it is a single coating or a multi-coat system.
salt-fog. Storage of the test panel in a test cabinet at 40 OC and
a relative humidity of 80 %. Assessment of the amount of
e) Procedure for initiation of corrosion including, in the
filiform corrosion developed from the scribed mark.
case of the salt fog technique, the period of exposure.
5 Test solutions
f) Duration of the test.
5.1 Sodium chloride solution, 1 g/litre (for the dipping
technique)
1 Scope and field of application
Prepare this solution by dissolving 1 g of sodium chloride (see
This International Standard describes a method for assessing 5.2) in 1 litre of distilled or demineralized water. Place this solu-
the protective action of coatings of paints or varnishes against tion in a vessel suitable for complete immersion of the test
filiform corrosion on steel. panel (see clause 8).
1
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SIST EN ISO 4623:1997
IS0 46234984 (E)
9 Procedure
5.2 Sodium chloride solution, 50 g/litre (for the salt-fog
technique)
Carry out the following procedure on at least two panels.
Prepare this solution by dissolving 50 + 5 g of sodium chloride
in 1 litre of distilled or demineralized water, as described in
9.1 Scribing the test panels
IS0 7253. The sodium chloride shall be white, of minimum
assay 99,6 % (m/m), substantially free from copper and nickel
Using a suitable tool (see the note), make two scribed marks at
and contain not more
than 0,l % (m/m) of sodium iodide.
least 50 mm long on each test panel. Make the scribed marks
perpendicular to each other and arranged in such a way that
their distance from each other or from the edge of the panel is
not less than 20 mm (see figure 1). Ensure that the cutting
6 Apparatus
edge completely penetrates the coating. Remove the debris
from the scribed marks. Ensure that the metal is clearly visible
Test cabinet, capable of being maintained at 40 + 2 OC and
over the entire length of the scribed marks.
a relative humidity of 80 + 5 %, and having provision for
placing or hanging the test panels in an approximately vertical
NOTE - The precise nature of the scribing tool is not critical provided
position so that the distance between the faces of adjacent
that it produces a thin line with well-defined edges. A sharp blade or
panels is at least 20 mm.
the single cutter defined in IS0 2409 have been found to be suitable.
NOTE - If a cabinet with automatic humidity control is not available,
the specified humidity may be obtained by means of a saturated
aqueous solution of ammonium sulfate. This gives a constant relative
humidity of 79 % at 40 OC (see ISO/R 483). Further details a
...
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