BS EN 60068-2-11-1999 Environmental testing - Test methods - Tests - Test KA - Salt mist《环境试验 试验方法 试验 试验 KA 盐雾》.pdf

1、BRITISH STANDARD Environmental testing - Part 2: Tests - Test Ka: Salt mist The European Standard EN 600682-11:1999 has the status of a British Standard ICs 19.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 60068-2-1 1: 1999 IEC 60068-2-1 1: 1981 BS EN 6006 - presen

2、t to the responsible inte them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a perio

3、d of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards nody include an annex which lists nonnative references to international publications with th

4、eir corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of

5、 the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

6、Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM STD

7、*BSI BS EN bOb8-2-11-ENGL 1999 Lb24bb9 0792882 745 EN 60068-2-1 1 April 1999 ICs 19.040 English version Environmental testing Part 2: Tests - Test Ka: Salt mist (IEC 60068-2-1 1 :I 981) Supersedes HD 323.2.1 1 S1:1988 Essais denvironnement Umweltprfungen Partie 2: Essais Teil 2: Prfungen Essai Ka: B

8、rouillard salin Prfung Ka: Salznebel (CE1 60068-2-1 1 :1981) (IEC 60068-2- 1 1 : 1 98 1 ) This European Standard was approved by CENELEC on 1999-04-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s

9、tatus of a national standard without any alteration. Up-to-date 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, Germa

10、n). A version in any other language made by translation under 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, Czech Rep

11、ublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnicai Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr

12、Elektrotechnische Normung Centrai Secretariat: cue de Stassart 35, B - 1050 Brussels 1999 CENELEC - Ali rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-11:1999 E STD*BSI,BS EN bOOb8-2-11-ENGL 1999 Lh24bb9 0392883 681 Page 2 EN 60068-2-1

13、1:1999 Foreword The text of the International Standard IEC 60068-2-1 1:1981, prepared by SC 50B (transformed into IEC TC 104 “Environmental conditions, classification and methods of test), was approved by CENELEC as HD 323.2.1 1 S1 on 1985-06-27. This Harmonization Document was submitted to the form

14、al vote for conversion into a European Standard and was approved by CENELEC as EN 60068-2-1 1 on 1999-04-01. The following date was fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dopl 2000-04-01 Endorse

15、ment notice The text of the International Standard IEC 60068-2-1 1 : 198 1 was approved by CENELEC as a European Standard without any modification. Page 3 EN 60068-2-11:1999 BASIC ENVIRONMENTAL TESTING PROCEDURES Part 2: Tats - Test Ka: Salt mist 1. Objeet The object of this test is to compare the r

16、esistance to deterioration from salt mist of specimens It is useful for evaluating the quality and the uniformity of protective coatings. of similar construction. 2. General The following restrictions shall be taken into account: a) the test is unsuitable as a general salt corrosion test; b) it is a

17、lso considered to be unsuitable for the evaluation of individual specimens intended for For equipment and components, Test Kb is considered to provide more realistic conditions and to provide means of assessment of individual items. If however, for particular circumstances, the relevant specificatio

18、n requires this test (Ka) to be. applied to individual specimens for qualification purposes, then the specimens should be tested as part of the overall assembly or equipment in which they are to be used and becomplete with any protection devices (cases, covers, shields, etc.), as in practice. use in

19、 salt-laden atmospheres. 3. Test apparatus 3.1 Test chamber The chamber for this test shall be constructed of such materials that will not influence the The detailed construction of the chamber, including the method of producing the mist, is corrosive effects of the salt mist. optional provided that

20、: a) the conditions in the chamber are within the limits specified; b) a sufficiently large volume with constant, homogeneous conditions (not affected by turbulence) is available; these conditions should not be influenced by the specimens under test ; c) no direct spray impinges upon the specimens u

21、nder test; d) drops of liquid accumulating on the ceiling, the walls or other parts cannot drip on the specimens ; e) the chamber shall be properly vented to prevent pressure build-up and allow uniform distribution of salt fog. The discharge end of the vent shall be protected from squalls which can

22、cause strong air currents in the chamber. Page 4 EN 60068-2- 11: 1999 3.2 Aiornizer (s) The atomizer(s) used shall be of such a design and construction as to produce a finely divided, wet, dense mist. The atomizer(s) shall be made of material that is non-reactive to the salt solution. 4. Saltmist 4.

23、1 Salt solution 4.1.1 Concentration The salt used for the test shall be high quality sodium chloride (NaCl) containing, when dry, The salt solution concentration shall be 5 f 1% by weight. The solution shall be prepared by dissolving 5 k 1 parts by weight of salt in 95 parts by weight not more than

24、0.1% sodium iodide and not more than 0.3% of total impurities. of distilled or demineralized water. 4.1.2 pH value The pH value of the solution shall be between 6.5 and 7.2, at a temperature of 35 f 2 “C. The pH value shall be maintained within this range during conditioning; for this purpose, dilut

25、ed hydrochloric acid or sodium hydroxide may be used to adjust the pH value provided that the concentrations of NaCI remains within the prescribed limits. The pH shall be measured when preparing each new batch of solution. The pH value may need to be adjusted, within the limits specified above, to m

26、eet the requirements of Clause 7. 4.1.3 The sprayed solution shall not be re-used. 4.2 Air supply The compressed air entering the atomizer(s) shall be essentially free from all impurities, such Means shall be provided to humidify and warm the compressed air as required to meet the operating conditio

27、ns. The air pressure shall be suitable to produce a finely divided dense mist with the atomizer(s) used. To ensure against clogging of the atomizer by salt deposition, it is recommended that the air have a relative humidity of at least 85% at the point of release from the nozzle. A satisfactory meth

28、od is to pass the air in very fine bubbles through a tower containing heated water which shall be automatically maintained at a constant level. The temperature of this water should be at least 35 “C. The permissible water temperature increases with increasing volume of air and with decreasing heat i

29、nsulation of the chamber and the surroundings of the chamber. as oil and dust. STD-BSI BS EN 600b8-2-11-ENGL 1997 II 1624667 0772b 370 Page 6 EN 60068-2-11:1999 The temperature should not exceed a value above which an excess of moisture is introduced into the chamber or a value which makes it imposs

30、ible to meet the requirements for operating tempera ture. 5. initial meamnb The test specimens shall be visually examined and, if necessary, electrically and mechanically checked as required by the relevant specification. The relevant specification shall prescribe the cleaning procedure to be applie

31、d immediately before the test; it shall also state whether temporary protective coatings shall be removed. Nore. - The cleaning method used shall not interfere with the effect of the salt mist on the test specimen, nor introduce any secondary corrosion. Touching of the test surfaces by hand should b

32、e avoided as far as possible before the test. 7. conditioning 7.1 The specimens shall be tested in their normal operating positions according to the relevant specification. They shall therefore be divided into lots, and each lot shall be tested in one of the operating positions. The specimens shall

33、not be in contact with each other or with other metal parts, and shall be so arranged as to exclude any influence of one part upon another. Note. - The position of the specimen in the test chamber (i.e. the inclination of its surface to the verticai) is of prime importance, and small differences in

34、position might lead to large differences in effect, depending on the shape of the specimen. 7.2 The temperature of the test chamber shall be maintained at 35 2 “C. 7.3 The salt mist conditions shall be maintained in all parts of the exposure zone, such that a clean collecting receptacle with a horiz

35、ontal collecting area of 80 cm, placed at any point in the exposure zone, shall collect between 1.0 ml and 2.0 ml of solution per hour averaged over a minimum period of 16 h. A minimum of two receptacles shall be used. The receptacles shall be placed such that they are not shielded by the test speci

36、mens and so that no condensate from any source will be collected. The contents of the receptacles may be combined, if necessary, for the measurements of pH values and concentration. Collection of the solution shall be made either before or during the test, as specified in Sub- clause 7.5. 7.4 The so

37、lution as collected in Sub-clause 7.3 shall, when measured at 35f2 OC, have concentration and pH as specified in Subclauses 4.1.1 and 4. I .2 respectively. 7.5 The measurement of both concentration and pH shall be made at the following times: a) For chambers in continuous use, measurements shall be

38、made following each test, on the solution collected during the test. Page 6 EN 60068-2-1 1:1999 b) For chambers not used continuously, a trial run between 16 and 24 h shall be made before the tests are performed. The measurements shall be made immediately following the triai run and before exposing

39、the specimens to be tested. Measurements as detailed in item a) above will also be made to ensure constant test conditions. 7.6 The relevant specification shall prescribe one of the following conditioning durations: 16 h, 24 h, 48 h (2 days), 96 h (4 days), 168 h (1 week), 336 h (2 weeks), 672 h (4

40、weeks). 8. Recovery At the completion of the test, small specimens, unless otherwise specified by the relevant specification, shall be washed in running tap water for 5 min, rinsed in distilled or de- mineralized water then shaken by hand or subjected to air blast to remove droplets of water. The te

41、mperature of the water used for washing shall not exceed 35 “C. If necessary, the relevant specification shall detail the methods to be used fr washing and The specimens shall then be stored under standard recovery conditions for not less than 1 h drying larger specimens. and not more than 2 h. 9. F

42、inal measurements The specimens shall be visually inspected and, if necessary, electrically and mechanically The results shall be recorded. checked as required by the relevant specification. Noie. -Precautions should be Men to ensure that remains of salt deposit do not impair the reproducibility of

43、the measurements. 10. Test reports Reports on this test shall include information necessary to compare the specimens tested. In addition, the duration of the exposure and the orientation in the test chamber shall be given. The measurement of concentration and pH shall also be included in the report.

44、 11. Information to be given in the relevant specification u) Initial measurements Clause 5 b) Preconditioning Clause 6 c) Position of the specimens during the test Subclause 7.1 d) Test duration Sub-clause 7.6 e) Recovery Clause 8 f) Final measurements Clause 9 STD-BSI BS EN bOOb8-2-Ll-ENGL 1999 Lb

45、24bb9 0772888 IL3 M BS EN 60068-2-1 1 : 1999 IEC 60068-2-1 1:1981 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international lev

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