1、CENELEC EN*hO*OhB- 2-60 96 W 3404583 0173033 05T BRITISH STANDARD Environmental testing Part 2. Tests Test Ke. Flowing mixed gas corrosion test The European Standard EN 6006Ek2-60 : 1996 has the status of a British Standard This part should be read in conjunction with BS EN 600681 : 1995 Geneml undg
2、uidance ICs 19.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYeowing mW gas m basic testing procedures and measuring methods - Part 2: General examination, electrical continuity and contact resistance tests, insulation tests and voltage stress rests IS0 431 : 1981 , Copper refinery
3、 shapes 2 lest 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 worki
4、ng 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: COPYRIGHT European Committee for Electrotechnical StandardizationLi
5、censed by Information Handling ServicesCENELEC EN*bO*Ob8- 2-60 76 W 3Y04583 0173040 29T m Page 4 EN 60068-2-60 : 1996 - 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
6、 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
7、 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
8、, 14 and 21 days. Four methods are defined. The different parameters for each method are summarized in the following table l. A guidance for the use of each method is given in clause C.3. Table 1 Parameters HpS (1 O-0 vol/vol) NO vollvol) i/ B 3 8 CI (1 0-0 vol/vol) so (1 o- vol/vol) 1 Temperature “
9、C RH % Volume changes per hour Weight increase of copper coupons mg / (dm2 x day) according to annex A Method 1 100 f 20 500 100 25 f 1 75 f 3 3- 10 1 ,o - 2.0 Method 2 10t5 200 * 50 lof5 30 f 1 70 f 3 Method 3 100 i 20 200 i 50 20 f 5 30 f 1 75 f 3 3-10 I 3- 10 0.3 - 1.0 1,2 - 2,2 Method 4 lot 5 20
10、0 f 20 lof5 200 f 20 25 f 1 75 f 3 3- 10 1,2 - 2.4 71 mm3 /m3 2) NO,: 1 pg/m3 = 0,53 mm3 /m3 vol/vol) = UNIT (pg/m3) 3) CI,: 1 pg/m3 = 0,34 mm3 /m3 4) SO,: 1 pg/m3 = 038 mm3 /m3 NOTE - Since the nature of the corrosive attack is different for the test methods 1 to 4, neither their numbering nor the
11、corr,esponding weight increase of copper coupons reflect their severity. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*bO*Ob8- 2-60 96 H 3404583 OL7304L L2b m Page 5 EN 60068-2-60 1996 4 Pre-conditionning The relevant specificati
12、on 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 co
13、mponents (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 specime
14、ns 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 wi
15、thin 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 t
16、o 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 o
17、f 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 8.6.3) can be used in addition to the copper coupons. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Informati
18、on Handling ServicesCENELEC EN*bO*ObA- 2-60 7b W 3404583 0173042 Ob2 W Page 6 EN 60068-2-60 : 1996 6.3 Testing procedure One of the following test procedures shall be used: Test procedure 7 When the test atmosphere does not contain chlorine (method 1) or when the method for measuring chlorine concen
19、tration 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: -
20、 measure and adjust gas concentrations. Allow to stabilize. When it is necessary to measure chlorine concentration, total chlorine (not only chlorine gas, CI,) present in the test atmosphere is taken as a measure of chlorine gas concentration. The chlorine added to the test atmosphere shall still on
21、ly be in the form of chlorine gas, CI,; - 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 uni
22、formly 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, matedhnmated, electrically loaded or operated) as stated in the relevant specification. The test duration shall be
23、 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
24、 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 i
25、s 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
26、 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 suffers interference from other gases in the test atmosphere, the following procedure
27、 shall be used: - start the flow of humid air, allow to stabilize and adjust temperature and humidity; COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services- start the flow of chlorine into the humid air stream and allow to stabilize; - measure an
28、d adjust the chlorine concentration. Allow to stabilize; - introduce the test specimens and the corrosion monitor 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 d
29、istributed 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, matedhnmated, electrically loaded or operated) as stated in the relevant specification; - allow temp
30、erature, humidity and chlorine concentration to stabilize, which may require considerable time due to initially high reaction or adsorption rates of chlorine with surfaces. Measure and adjust, if necessary, chlorine concentration. During this adjustment, any overshooting of gas concentration shall b
31、e avoided. The chlorine concentration shall remain stable for 2 h minimum. The maximum allowed duration of this period of chlorine stabilization and adjustments, to prescribed values, is 24 h; - start the flow of the remaining gases and allow to stabilize. Measure and adjust, if necessary, temperatu
32、re, humidity and gas concentrations, excluding chlorine. During these adjustments any overshooting of gas concentration shall be avoided. The maximum allowed duration of this period of stabilization and adjustments, to prescribed values, is 24 h. The test duration is measured from the moment when al
33、l gases are present in the test atmosphere; - during the course of testing, temperature, humidity and gas concentrations shall be kept within the prescribed limits. Chlorine concentration, however, cannot be controlled during the test. The way to ensure values remain within the limits is the chlorin
34、e measurement prescribed after finishing the test (see below). 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
35、 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, stop the flow of gases except chlorine which shall remain running. Allow sufficient time to empty the
36、chamber of the other gases, to an extent sufficient to avoid interference with chlorine analyses; - measure the chlorine concentration which will have to be within the limits prescribed in order for the test to be valid; - remove the test specimens and the corrosion monitoring materials. 7 Recovery
37、After removal of the specimens from the test chamber they shall be stored in accordance with the relevant specification prior to final measurements. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesPage 8 EN 60068-2-60 : 1996 8 Final measureme
38、nts The final measurements shall be carried out as required by the relevant specification which may also require a visual examination of the specimens after the test. The relevant specification shall provide the criteria upon which the acceptance or rejection of the specimen is to be based. If the n
39、ecessary measurements cannot be made within the specified time, the period of storage under recovery conditions may be extended to a maximum of one week. Such an extension shall be mentioned in the test report. 9 Information to be given in the relevant specification When this test is included in a r
40、elevant specification, the following details shall be given, in so far as they are applicable. The relevant specification shall supply information as required in the clauses listed below, paying particular attention to the items marked with an asterisk r) as this information is always required. Clau
41、se a) Method 3 b) Test duration* 3 c) Pre-conditioning of the specimens 4 d) Initial measurements 5 e) Conditions of the specimens during the test 6 f) Operation and loading during testing 6 g) Recovery and duration+ 7 h) Final measurements* and possible visual examination 8 i) Criteria of acceptanc
42、e or rejection 8 10 Information to be given in the test report test method; test duration; pre-conditioning; method and results of initial measurement; conditions and duration of test; operation and loading during test; recovery and duration; method and results of final measurement; individual weigh
43、t increase of copper coupon in mg/(dm2 x day); any deviation from the standard. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC N*bO*Obd- 2-60 96 m 3404583 0373045 871 m Page 9 EN 60068-2-60 : 1996 Annex A (normative) Corrosion monito
44、ring copper coupons Copper coupons are exposed with the test specimen in order to verify the conformance of the test to the limits set out in the standard. The weight gain of the coupons shall be taken as a measure of this conformity. A.l Nature and dimension The coupons shall be made from half hard
45、 OFHC copper (Cu-OF according to IS0 431) sheet, maximum thickness of 0,5 mm, and have a total surface area of O, dm2 to 0,2 dm2 each. A.2 Cleaning procedure Before the start of the test, the copper coupons shall be cleaned, as described below, weighed on a balance with appropriate sensitivity and s
46、tored for a maximum of 120 h in a dessicator with non-corrosive dehydrating agent. The cleaning procedure of the copper coupons shall be as follows: - cathodic degrease in 1 N NaOH, for 15 S to 30 S, at 5 V to 10 V, using a stainless steel anode or platinium anode, - rinse with tap water; - rinse wi
47、th demineralized water; - activate by dipping in 10 % H2S0, for 20 S to 30 S; - rinse with tap water; - rinse with demineralized water; - rinse with alcohol: denatured ethyl alcohol or isopropyl alcohol; - dry with warm air (about 50 “C). All solutions shall be prepared with demineralized water, of
48、at least the same quality as used in the climatic system. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*bO*Ob8- 2-60 96 m 3404583 0373046 708 m Page 10 EN 60068-2-60 : 1996 Annex B (informative) Description of test apparatus 6.1
49、General The test apparatus consists of a climatic system, a test enclosure, a gas delivery system and gas analyzing systems. Examples of test apparatus are shown in figures B.l , 8.2 and B.3. O11 trapMlter P Figure B.l - Example of test apparatus Gas delivery using gas bottles with diluted gas, outer chamber with humid air, premixing corrosive gases with dry air, ,negative pressure within test enclosure. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesCENELEC EN*bO*ObA- 2-60 96 3404583 0173047 644 Page 11 EN 60068-2-60 : 1
