SIST EN 60068-2-52:2001

SLOVENSKI STANDARD
SIST EN 60068-2-52:2001
01-september-2001
Environmental testing - Part 2: Tests - Test Kb: Salt mist, cyclic (sodium chloride
solution)
Environmental testing -- Part 2: Tests - Test Kb: Salt mist, cyclic (sodium chloride
solution)
Umweltprüfungen -- Teil 2: Prüfverfahren - Prüfung Kb: Salznebel, zyklisch
(Natriumchloridlösung)
Essais d'environnement -- Partie 2: Essais - Essai Kb: Brouillard salin, essai cyclique
(solution de chlorure de sodium)
Ta slovenski standard je istoveten z: EN 60068-2-52:1996
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN 60068-2-52:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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NORME CEI
INTERNATIONALE
IEC



60068-2-52
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

1996-01


BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Essais d’environnement –
Partie 2-52:
Essais – Essai Kb: Brouillard salin,
essai cyclique (solution de chlorure de sodium)

Environmental testing –
Part 2-52:
Tests – Test Kb: Salt mist, cyclic
(sodium chloride solution)



CODE PRIX
L
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

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I

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68-2-52 © IEC:1996 - 3 -
CONTENTS
Page
FOREWORD 5
Clause
1 Scope 7
9
2 Normative references
9
3 General description of the test
11
4 Test apparatus
13
5 Salt solution
13
6 Severities
7 Initial measurements 15
15
8 Pre-conditioning
15
9 Testing
17
10 Recovery (at the end of testing)
17
11 Final measurements
19
12 Information to be given in the relevant specification
21
Figure 1 - Schematic time-scale of the different test severities (1) to (6)

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68-2-52 © IEC:1996 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––
ENVIRONMENTAL TESTING –
Part 2: Tests – Test Kb: Salt mist, cyclic
(sodium chloride solution)
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international cooperation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 68-2-52 has been prepared by subcommittee 50B: Climatic
tests, of IEC technical committee 50: Environmental testing.
This second edition cancels and replaces the first edition published in 1984, and constitutes a
technical revision.
It has the status of a basic safety publication in accordance with IEC Guide 104.
The text of this standard is based on the following documents:
FDIS Report on voting
50B/363/FDIS 50B/374/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

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68-2-52 © IEC:1996
- 7 -
ENVIRONMENTAL TESTING -
Part 2: Tests - Test Kb: Salt mist, cyclic
(sodium chloride solution)
1 Scope
This test is intended for application to components or equipment designed to withstand
a salt-laden atmosphere, depending on the chosen severity. Salt can degrade the perfor-
mance of parts manufactured using metallic and/or non-metallic materials.
The mechanism of salt corrosion in metallic materials is electrochemical, whereas the
degradation effects experienced on non-metallic materials are caused by complex
chemical reactions of the salts with the materials involved. The rate at which corrosive
action takes place is dependent, to a large extent, on the supply of oxygenated salt
solution to the surface of the test specimen, the temperature of the specimen and the
temperature and humidity of the environment.
Apart from the corrosive effects, this test may be used to indicate deterioration of some
non-metallic materials by assimilation of salts. In the following test methods, the period of
spraying with the relevant salt solution is sufficient to wet the specimen thoroughly.
Because this wetting is repeated after intervals of storage under humid conditions
(severities (1) and (2) and - in some cases severities (3) to (6)) - supplemented by
storage under a standard atmosphere for testing, it goes some way to reproducing the
effects of natural environments.
Severities (1) and (2) are intended to be used for testing products which are used in a
marine environment, or in close proximity to the sea. Severity (1) should be used to test
products which are exposed to the environment for much of their operational life (e.g. ship
radar, deck equipment). Severity (2) should be used to test products which may be
exposed to the marine environment from time to time but will normally be protected by an
enclosure (e.g. navigational equipment which will normally be used on the bridge or in a
control room).
Additionally, severities (1) and (2) are commonly used as a general corrosion test in
component quality assurance procedures.
Severities (3) to (6) are intended for products where, under normal use, there is a frequent
change between salt-laden and dry atmosphere, e.g. automobiles and their pa rts.
Severities (3) to (6), compared to severities (1) and (2), therefore include an additional
storage under a standard atmosphere for testing.
The period of dry atmosphere may happen, in practice, during breaks of operation, e.g.
during the weekend. This inclusion of such a dry period in severities (3) to (6) leads to
corrosion mechanism which can be quite different from those under constant humid
conditions.

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68-2-52 © IEC:1996 - 9 -
The test is accelerated compared with most service conditions. However, it is not possible
to establish an overall acceleration factor for all kinds of specimen (see IEC 355).
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part of IEC 68-2. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this part of IEC 68-2 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. Members
of IEC and ISO maintain registers of currently valid International Standards.
Environmental testing - Part 1: General and guidance
IEC 68-1: 1988,
Environmental testing - Part 2: Tests - Test Ca: Damp heat, steady
IEC 68-2-3: 1969,
state
An appraisal of the problems of accelerated testing for atmospheric
IEC 355: 1971,
corrosion
3 General description of the test
For severities (1) and (2), the test procedure is separated into a specified number of
periods of spraying by a salt mist at a temperature between 15 °C and 35 °C, each
followed by a storage period under humid conditions at 40 °C ± 2 °C, (93+3) % relative
humidity.
For severities (3), (4), (5) and (6) the test procedure is separated into a specified number of
test cycles. Each test cycle consists of four periods of spraying by a salt mist at a temperature
between 15 °C and 35 °C, each immediately followed by a storage period under humid
conditions at 40 °C ± 2 °C, (931) % relative humidity, and of one storage period under a
standard atmosphere for testing at 23 °C ± 2 °C and 45 % to 55 % relative humidity after
these four periods of spraying and storage under humid conditions.
If the spray period and storage period are carried out in different chambers, care should
be taken to avoid loss of salt solution deposits on the specimen and to avoid any damage
to the specimen due to handling.
The specimen is never energized during the spray period, and not normally during the
storage period.

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68-2-52 © IEC:1996
4 Test apparatus
4.1 Salt mist chamber
The chamber for this test shall be constructed of such materials that will not influence the
corrosive effects of the salt mist.
The detailed construction of the chamber, including the method of producing the salt mist
is optional, provided that:
a) the conditions in the chamber are within the limits
...