1、BRITISH STANDARD BS EN 60068-2-60: 1996 IEC68-2-60: 1995 Environmental testing Part 2: Tests Test Ke: Flowing mixed gas corrosion test The European Standard EN60068-2-60:1996 has the status of a British Standard This part should be read in conjunction with BS EN60068-1:1995 General and guidance ICS
2、19.040BSEN60068-2-60:1996 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June1996 BSI 06-1999 The following BSI references relate to the work on this standard:
3、Committee reference GEL/50 Draft for comment 95/20077 DC ISBN 0 580 25660 X Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee GEL/50, Environmental testing of electrotechnical products, upon which the following bodies were
4、represented: Federation of the Electronics Industry GAMBICA (BEAMA Ltd.) Society of Motor Manufacturers and Traders Limited Ministry of Defence The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Institute of Materials National Supervising In
5、spectorate (BSI PC) Society of Environmental Engineers Biodeterioration Society Amendments issued since publication Amd. No. Date CommentsBS EN 60068-2-60:1996 BSI 06-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN60068-2-60 3BS EN 60068-2-60
6、:1996 ii BSI 06-1999 National foreword This British Standard has been prepared by Technical Committee GEL/50and is the English language version of EN60068-2-60:1996Environmental testing Part2: Tests Test Ke: Flowing mixed gas corrosion test, published by the European Committee for Electrotechnical S
7、tandardization (CENELEC). It is identical with IEC68-2-60:1995published by the International Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complia
8、nce with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesiandii, theEN title page, pages2 to14 and a back cover. This standard has been updated (see copyright date) and may have had amen
9、dments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60068-2-60 January 1996 ICS 19.040 Descriptors: Electricity, component, electrotechnical product, environment testing, atmospheric corrosion, corrosive ga
10、s English version Environmental testing Part 2: Tests Test Ke: Flowing mixed gas corrosion test (IEC68-2-60:1995) Essais denvironnement Partie 2: Essais Essai Ke: Essai de corrosion dans un flux de mlange de gaz (CEI68-2-60:1995) Umweltprfungen Teil 2: Prfungen Prfung Ke: Korrosionsprfung mit strmen
11、dem Mischgas (IEC68-2-60:1995) This European Standard was approved by CENELEC on1995-11-28. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-d
12、ate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation unde
13、r the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, L
14、uxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Bru
15、ssels 1996 Copyright reserved to CENELEC members Ref. No. EN60068-2-60:1996 EEN 60068-2-60:1996 BSI 06-1999 2 Foreword The text of document50B/359/DIS, future edition2of IEC68-2-60, prepared by SC50B, Climatic tests, of IEC TC50, Environmental testing, was submitted to the IEC-CENELEC parallel vote
16、and was approved by CENELEC as EN60068-2-60 on1995-11-28. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex A and Annex ZA are normative and Annex B and Annex C
17、 are informative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 1 General 3 1.1 Scope 3 1.2 Normative references 3 2 Test apparatus 3 3 Severities 3 4 Pre-conditioning 3 5 Initial measurements 3 6 Testing 3 6.1 Test specimens 3 6.2 Corrosivity monitor materials 4 6.3 Testing procedure
18、 4 7 Recovery 6 8 Final measurements 6 9 Information to be given in the relevant specification 6 10 Information to be given in the test report 6 Annex A (normative) Corrosion monitoring coppercoupons 7 Annex B (informative) Description of test apparatus 8 Annex C (informative) Guide to the selection
19、 ofmethods and test duration 13 Annex ZA (normative) Normative references tointernational publications withtheir corresponding European publications 14 Figure B.1 Example of test apparatus 8 Figure B.2 Example of test apparatus 9 Figure B.3 Example of test apparatus 10 Table 1 4 latest date by which
20、 the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1996-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow)1996-09-01EN60068-2-60:1996 BSI 06-1999 3 1 General 1.1 Scope This part of
21、IEC68-2 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
22、 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 norma
23、tive documents contain provisions which, through reference in this text, constitute provisions of this part of IEC68-2. 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 IEC68-2 are encourage
24、d 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. IEC512-2:1985, Electromechanical components for electronic equipment; basic testing procedures and measur
25、ing methods Part2: General examination, electrical continuity and contact resistance tests, insulation tests and voltage stress tests. ISO431:1981, Copper refinery shapes. 2 Test apparatus The test apparatus consists of a climatic system, test enclosure, gas delivery system and means for measuring g
26、as 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; ai
27、r and water used shall be sufficiently clean in order not to affect performance of the test; 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
28、 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/(dm 2 day) according to Annex A) at each location differs by maximum1
29、5% 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 are4,7,10,14and21days. Four methods are defined. The
30、 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. 4 Pre-conditionning The relevant specification may require pre-conditioning of specimens, for example cleaning or mechanical operation. 5 Initial measurements
31、Initial measurements shall be carried out as required by the relevant specification. Generally these measurements are: contact resistance measurements for electromechanical product components (IEC512-2, test2a); insulation resistance measurements (IEC512-2, test3a). 6 Testing Samples exposed in the
32、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
33、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.EN 60068-2-60:1996 4 BSI 06-1999 Table 1 The conditions of the specimens and the test chamber shal
34、l 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,
35、 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. O
36、ther vehicles, for example, gold-plated coupons or other specimens (seeB.6.3) can be used in addition to the copper coupons. 6.3 Testing procedure One of the following test procedures shall be used: Test procedure 1 When the test atmosphere does not contain chlorine (method1) or when the method for
37、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
38、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 atmo
39、sphere shall still only be in the form of chlorine gas, Cl 2 ; introduce the test specimens and the corrosion monitoring materials as prescribed in6.2. The copper coupons shall be exposed with the test specimens for the full test period. The test specimens and the corrosion monitoring materials shal
40、l 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 t
41、est duration shall be measured from this point; Parameters Method 1 Method 2 Method 3 Method 4 H 2 S (10 9vol/vol) a 10020 105 10020 105 NO 2(10 9vol/vol) b 20050 20050 20020 Cl 2(10 9vol/vol) c 105 205 105 SO 2(10 9vol/vol) d 500100 20020 Temperature C 251 301 301 251 RH % 753 753 753 753 Volume ch
42、anges perhour 310 310 310 310 Weight increase of copper coupons mg/(dm 2 day) according to Annex A 1,02,0 0,31,0 1,22,2 1,22,4 NOTESince the nature of the corrosive attack is different for the test methods 1to4, neither their numbering nor the corresponding weight increase of copper coupons reflect
43、their severity. a H 2 S: 1g/m 3 =0,71mm 3 /m 3 b NO 2 : 1g/m 3 =0,53mm 3 /m 3(10 9vol/vol)=UNIT (g/m 3 ) c Cl 2 : 1g/m 3 =0,34mm 3 /m 3 d SO 2 : 1g/m 3 =0,38mm 3 /m 3EN60068-2-60:1996 BSI 06-1999 5 allow the test conditions to stabilize, which may require considerable time. Measure and adjust, if ne
44、cessary, 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, is24h; during the course of testing, temperature, humidity and gas
45、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 than4 days. One opening is allowed for a test duration of between4 and10 days. One opening per we
46、ek is allowed for a test duration exceeding10 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 te
47、st atmosphere (methods2 to4) and when the method for measuring chlorine suffers interference from other gases in the test atmosphere, the following procedure shall be used: start the flow of humid air, allow to stabilize and adjust temperature and humidity; start the flow of chlorine into the humid
48、air stream and allow to stabilize; measure and adjust the chlorine concentration. Allow to stabilize; introduce the test specimens and the corrosion monitor materials as prescribed in6.2. The copper coupons shall be exposed with the test specimens for the full test period. The test specimens and the
49、 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; allow temperature, humidity and chlorine concentration to stabilize, which may require considerable time due to initially high re
