EN 60068-2-60:1996
(Main)Environmental testing - Part 2: Tests - Test Ke: Flowing mixed gas corrosion test
Environmental testing - Part 2: Tests - Test Ke: Flowing mixed gas corrosion test
Determines the corrosive influence of operating and storage indoor environments on electrotechnical products components, equipment and materials, particularly contacts and connections, considered separately, integrated into a subassembly or assembled as a complete equipment. Has the status of a basic publication in accordance with IEC Guide 104.
Umgebungseinflüsse - Teil 2: Prüfungen - Prüfung Ke: Korrosionsprüfung mit strömendem Mischgas
Essais d'environnement - Partie 2: Essais - Essai Ke: Essais de corrosion dans un flux de mélange de gaz
Etablit l'influence corrosive de l'environnement sur des composants électrotechniques, des équipements et des matériels, en fonctionnement ou stockés à l'intérieur de bâtiments, en particulier sur des contacts et des connections, pris individuellement, intégrés dans un sous-ensemble ou faisant partie d'un équipement complet. A le statut d'une publication fondamentale de sécurité conformément au Guide 104.
Environmental testing - Part 2: Tests - Test Ke: Flowing mixed gas corrosion test
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2001
Environmental testing - Part 2: Tests - Test Ke: Flowing mixed gas corrosion test
Environmental testing -- Part 2: Tests - Test Ke: Flowing mixed gas corrosion test
Umweltprüfungen -- Teil 2: Prüfungen - Prüfung Ke: Korrosionsprüfung mit strömendem
Mischgas
Essais d'environnement -- Partie 2: Essais - Essai Ke: Essais de corrosion dans un flux
de mélange de gaz
Ta slovenski standard je istoveten z: EN 60068-2-60:1996
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME CEI
INTERNATIONALE IEC
68-2-60
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1995-12
PUBLICATION FONDAMENTALE DE SÉCURITÉ
BASIC SAFETY PUBLICATION
Essais d'environnement —
Partie 2:
Essais — Essai Ke: Essais de corrosion
dans un flux de mélange de gaz
Environmental testing —
Part 2:
Tests — Test Ke: Flowing mixed gas
corrosion test
© CEI 1995 Droits de reproduction réservés — Copyright — all rights reserved
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les microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher.
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68-2-60 © IEC:1995 – 3 –
CONTENTS
Page
FOREWORD 5
Clause
1 General
1.1 Scope 9
1.2 Normative references 9
2 Test apparatus 9
3 Severities 11
4 Pre-conditioning 13
5 Initial measurements 13
6 Testing 13
6.1 Test specimens 13
6.2 Corrosivity monitor materials 13
6.3 Testing procedure 15
7 Recovery 17
8 Final measurements 19,
9 Information to be given in the relevant specification 19
10 Information to be given in the test report 19
Annexes
A Corrosion monitoring copper coupons 21
B Description of test apparatus 23
C Guide to the selection of methods and tests duration 39
68-2-60 © IEC:1995 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ENVIRONMENTAL TESTING -
Part 2 : Tests -
Test Ke : Flowing mixed gas corrosion test
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 co-operation 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 repo rt
s 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. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 68-2-60 has been prepared by sub-committee 50B : Climatic tests,
of IEC technical committee 50: Environmental testing.
This second edition cancels and replaces IEC 68-2-60 (TTD) (1990) and constitutes a technical
revision.
The text of this standard is based on IEC 68-2-60 (TTD) (1990) and the following documents:
FDIS
Repo rt on voting
50B/359/FDIS
50B/372/RV D
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
It has the status of a basic safety publication in accordance with IEC Guide 104.
68-2-60 © IEC:1995 – 7 –
IEC 68 consists of the following pa
rts, under the general title: Environmental testing:
– Part 1 : General and guidance
– Part 2 : Tests
– Part 3 : Background information
– Part 4 : Information for specific writers – Test summaries
– Part 5 : Guide to drafting of test methods
Annex A forms an integral part of this standard.
Annexes B and C are for information only.
68-2-60 © IEC:1995
–9 -
ENVIRONMENTAL TESTING -
Part 2 : Tests -
Test Ke : Flowing mixed gas corrosion test
1 General
1.1 Scope
This part of IEC 68-2 determines the corrosive influence of operating and storage indoor
environments on electrotechnical products components, equipment and materials, particularly
contacts and connections, considered separately, integrated into a subassembly or assembled
as a complete equipment.
It provides test methods giving information, on a comparative basis, to aid the selection of
materials, choice of production processes and component design, with regard to corrosion
resistance. A guide to the selection of methods and test duration is provided in annex C.
1.2 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 pa rties 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 listed below. Members of IEC and ISO maintain
registers of current valid International Standards.
IEC 512-2: 1985, Electromechanical components for electronic equipment; basic testing
procedures and measuring methods – Pa rt 2: General examination, electrical continuity and
contact resistance tests, insulation tests and voltage stress tests
ISO 431: 1981, Copper refinery shapes
2 Test apparatus
The test apparatus consists of a climatic system, test enclosure, gas delivery system and
means for measuring gas concentration.
Details of design and construction are optional but shall be such that the conditions specified
for each method are fulfilled throughout the working volume and shall comply with the following
requirements:
– water droplets or aerosols shall not be injected into the test enclosure;
– air and water used shall be sufficiently clean in order not to affect performance of the
test;
68-2-60 © IEC:1995 – 11 –
– the test atmosphere shall flow through the enclosure in such a manner as to ensure
uniform test conditions within the working volume;
– the sampling point for gas analyses shall be in the working volume of the test enclosure;
– the exhaust gases shall be treated in accordance with the relevant regulatory
stipulations.
The working volume is the volume within which the individual corrosion (weight increase of
copper coupons expressed in mg / (dm2 x day) according to annex A) at each location differs
by maximum 15 % from the average corrosion of all coupons within the working volume.
3 Severities
The test severity shall be given in the relevant specification. It is defined by:
the test method, chosen from table 1, and
–
– the test duration.
Preferred durations are 4, 7, 10, 14 and 21 days.
Four methods are defined. The different parameters for each method are summarized in the
following table 1. A guidance for the use of each method is given in clause C.3.
Table 1
Parameters Method 1 Method 2 Method 3 Method 4
HS (10A -9 vol/vol) 1) 100 t 20 10 t 5 100 * 20 10 t 5
9,
2)
200 t 50 200 t
NO, (10-9 vol/vol) 200 t 50 20
3)
CI(10-9 vol/vol) 10 t 5 20 t 5 10 ± 5
4)
SO, (10-9 vol/vol) 500 ± 100 200 t 20
Temperature °C 25 ± 1 30 ± 1 30 ± 1 25 ± 1
RH% 75t3 70±3 75±3 75±3
Volume changes
per hour 3-10 3-10 3-10 3-10
Weight increase
of copper coupons
mg / (dm2 x day)
1,2 - 2,2 1,2 - 2,4
according to annex A 1,0 - 2,0 0,3 - 1,0
1) H 2S: 1 µg/m 3 = 0 71 mm 3 /m3
2) NO2: 1 gg/m 3 = 0,53 mm 3 /m3 (10-9 vol/vol) = UNIT (µg/m3)
3) Cl 2: 1 µg/m 3 = 0,34 mm 3 /m3
4) SO2: 1 gg/m 3 = 0,38 mm 3 /m3
NOTE – Since the nature of the corrosive attack is different for the test methods 1 to 4, neither their numbering
nor the corresponding weight increase of copper coupons reflect their severity.
68-2-60 © IEC:1995 – 13 –
4 Pre-
conditionning
The relevant specification may require pre-conditioning of specimens, for example cleaning or
mechanical operation.
Initial measurements
Initial measurements shall be carried out as required by the relevant specification.
Generally these measurements are:
–
contact resistance measurements for electromechanical product components (IEC 512-2,
test 2a);
insulation resistance measurements (IEC 512-2, test 3a).
6 Testing
Samples exposed in the tests shall be:
– the specimens being evaluated;
– corrosion monitor materials.
6.1 Test specimens
The relevant product specification shall define the conditions of the specimens during the test,
for example mated or unmated for connectors; contacts open or closed for switches, operated
or electrically loaded.
The duration of the operation or loading of heat-dissipating specimens, shall be such that the
temperature and the relative humidity in the working volume remain within the specified
tolerances.
The conditions of the specimens and the test chamber shall be such that condensation on the
specimens shall not occur when they are introduced into the test chamber.
6.2 Corrosivity monitoring materials
Copper coupons shall be exposed with the test specimens in order to verify the conformance of
the test specimen.
A minimum of five test coupons of copper, prepared in accordance with annex A, shall be
exposed with the test specimens for the same duration. Their increase in weight during the
test, measured with appropriate sensitivity, shall be taken as a measure of the corrosion and
as a monitor of the reproducibility and repeatibility of the test.
Other vehicles, for example, gold-plated coupons or other specimens (see B.6.3) can be used
in addition to the copper coupons.
68-2-60 © IEC:1995 – 15 –
6.3 Testing procedure
One of the following test procedures shall be used:
Test procedure 1
When the test atmosphere does not contain chlorine (method 1) or when the method for
measuring chlorine concentration does not suffer interference from the other gases present in
the test atmosphere, the following procedure shall be adopted:
– start the flow of humid air, allow to stabilize and adjust temperature and humidity;
– start the flow of the gases into the humid air stream and allow to stabilize;
– measure and adjust gas concentrations. Allow to stabilize. When it is necessary to
measure chlorine concentration, total chlorine (not only chlorine gas, Cl 2) present in the test
atmosphere is taken as a measure of chlorine gas concentration. The chlorine added to the
test atmosphere shall still only be in the form of chlorine gas, C12;
– introduce the test specimens and the corrosion monitoring materials as prescribed in 6.2.
The copper coupons shall be exposed with the test specimens for the full test period. The
test specimens and the corrosion monitoring materials shall be distributed uniformly in the
working volume. They shall not come in contact with one another nor shield one another
from the test atmosphere. The test specimens shall be in the condition (for example,
mated/unmated, electrically loaded or operated) as stated in the relevant specification. The
test duration shall be measured from this point;
– allow the test conditions to stabilize, which may require considerable time. Measure and
adjust, if necessary, temperature, humidity and gas concentrations. During these
adjustments, any overshooting of gas concentration shall be avoided. Maximum allowed
duration of this period of stabilization and adjustments, to prescribed values, is 24 h;
– during the course of testing, temperature, humidity and gas concentrations shall be kept
within the prescribed limits. The chamber is allowed to be opened during the test.
The number of openings shall be limited.
No opening is allowed for a test duration shorter than 4 days.
One opening is allowed for a test duration of between 4 and 10 days.
One opening per week is allowed for a test duration exceeding 10 days.
The duration of these openings shall be limited to the time necessary to remove and
introduce specimens;
– at the end of the test period, remove the specimens and the corrosion monitoring
materials.
Test procedure 2
When chlorine is present in the test atmosphere (methods 2 to 4) and when the method for
measuring chlorine suffer
...
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