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1、BRITISH STANDARD BS 2011-2.1Ka: 1982 IEC 68-2-11: 1981 Basic environmental testing procedures Part 2.1: Tests Test Ka. Salt mist (This Part should be read in conjunction with Part 1.1 General) UDC 621.3.002.6.001.4:620.169.1:620.193.272 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38
2、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2011-2.1Ka:1982 This British Standard, having been prepared under the direction of the General Electrotechnical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 July 1982 BSI 03-1999 Firs
3、t published August 1977 First revision July 1982 The following BSI references relate to the work on this standard: Committee reference GEL/15 Draft for comment 79/28330 DC ISBN 0 580 12821 0 National foreword This revision of BS 2011-2.1Ka:1977 has been prepared under the direction of the General El
4、ectrotechnical Engineering Standards Committee. It is identical with IEC Publication 68-2-11:1981 “Basic environmental testing procedures, Part 2: Tests, Test Ka: Salt mist” published by the International Electrotechnical Commission (IEC), and like all other Parts of IEC Publication 68 (except IEC 6
5、8-2-42 and IEC 68-2-43) it is subject to CENELEC Harmonized Document (HD) 323. This standard has been prepared as a result of international discussions in which the UK took an active part. This standard supersedes BS 2011-2.1Ka:1977, which is withdrawn. Terminology and conventions. The text of the i
6、nternational standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards. Cross-reference. In clause 2 of this standard reference is made, for information only, to test
7、 Kb. This reference is not to BS 2011-2.1Kb:1977 (which is not aligned to any Part of IEC Publication 68), but to a proposed new IEC test Kb: Salt mist, cyclic, which will form the subject of a draft for public comment in due course. If and when this new test is published, then it is expected that t
8、his will be published as a dual-numbered British Standard which will supersede BS 2011-2.1Kb:1977, which will then be withdrawn. Textual error. When adopting the text of the international standard, the textual error given below was discovered. It has been marked in the text and has been reported to
9、IEC in a proposal to amend the text of the international standard. In 3.1 e), line 2, the term “salt fog” should be read as “salt mist”. Additional information. All parts of BS 2011 are listed in BSI Sectional List 26 (SL 26), which is usually revised annually. A British Standard does not purport to
10、 include all 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. Summary of pages This document comprises a front cover, an inside front cover,
11、pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComment
12、s Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2011-2.1Ka:1982 BSI 03-1999i Contents Page National forewordInside front cover 1Object1 2General1 3Test apparatus1 4Salt mist1 5Initial measurements2 6Pre-conditioning2 7Conditioning2 8Rec
13、overy2 9Final measurements2 10Test reports2 11Information to be given in the relevant specification3 Publication referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na
14、, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2011-2.1Ka:1982 BSI 03-19991 1 Object The object of this test is to compare the resistance to deterioration from salt mist of specimens of similar construction. It is useful for evaluating the quality and the uniformity of protectiv
15、e coatings. 2 General The following restrictions shall be taken into account: a) the test is unsuitable as a general salt corrosion test; b) it is also considered to be unsuitable for the evaluation of individual specimens intended for use in salt-laden atmospheres. For equipment and components, Tes
16、t Kb is considered to provide more realistic conditions and to provide means of assessment of individual items. If however, for particular circumstances, the relevant specification requires this test (Ka) to be applied to individual specimens for qualification purposes, then the specimens should be
17、tested as part of the overall assembly or equipment in which they are to be used and be complete with any protection devices (cases, covers, shields, etc.), as in practice. 3 Test apparatus 3.1 Test chamber The chamber for this test shall be constructed of such materials that will not influence the
18、corrosive effects of the salt mist. The detailed construction of the chamber, including the method of producing the mist, is optional provided that: a) the conditions in the chamber are within the limits specified; b) a sufficiently large volume with constant, homogeneous conditions (not affected by
19、 turbulence) is available; these conditions should not be influenced by the specimens under test; c) no direct spray impinges upon the specimens under 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
20、to prevent pressure build-up and allow uniform distribution of salt fog1). The discharge end of the vent shall be protected from squalls which can cause strong air currents in the chamber. 3.2 Atomizer(s) The atomizer(s) used shall be of such a design and construction as to produce a finely divided,
21、 wet, dense mist. The atomizer(s) shall be made of material that is non-reactive to the salt solution. 4 Salt mist 4.1 Salt solution 4.1.1 Concentration The salt used for the test shall be high quality sodium chloride (NaCl) containing, when dry, not more than 0.1 % sodium iodide and not more than 0
22、.3 % of total impurities. The salt solution concentration shall be 5 1 % by weight. The solution shall be prepared by dissolving 5 1 parts by weight of salt in 95 parts by weight 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 tempe
23、rature of 35 2 C. The pH value shall be maintained within this range during conditioning; for this purpose, diluted hydrochloric acid or sodium hydroxide may be used to adjust the pH value provided that the concentrations of NaCl remains within the prescribed limits. The pH shall be measured when pr
24、eparing each new batch of solution. The pH value may need to be adjusted, within the limits specified above, to meet 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
25、, such as oil and dust. Means shall be provided to humidify and warm the compressed air as required to meet the operating conditions. 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
26、 is recommended that the air have a relative humidity of at least 85 % at the point of release from the nozzle. A satisfactory method 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 w
27、ater should be at least 35 C. 1) See national foreword for details of textual error. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2011-2.1Ka:1982 2 BSI 03-1999 The permissible water temperature increases with increasing volume of air a
28、nd with decreasing heat insulation of the chamber and the surroundings of the chamber. The temperature should not exceed a value above which an excess of moisture is introduced into the chamber or a value which makes it impossible to meet the requirements for operating temperature. 5 Initial measure
29、ments The test specimens shall be visually examined and, if necessary, electrically and mechanically checked as required by the relevant specification. 6 Pre-conditioning The relevant specification shall prescribe the cleaning procedure to be applied immediately before the test; it shall also state
30、whether temporary protective coatings shall be removed. NOTEThe 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 be avoided as far as possible before the test. 7 Conditi
31、oning 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 not be in contact with each other or with other metal pa
32、rts, and shall be so arranged as to exclude any influence of one part upon another. NOTEThe position of the specimen in the test chamber (i.e. the inclination of its surface to the vertical) is of prime importance, and small differences in position might lead to large differences in effect, dependin
33、g 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 horizontal collecting area of 80 cm2, placed at any point in the e
34、xposure 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 specimens and so that no condensate from any source will be colle
35、cted. 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 solution as collected in Sub-clause 7.3 shall, when measured at
36、 35 2 C, have concentration and pH as specified in Sub-clauses 4.1.1 and 4.1.2 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 made following each test, on the solution collected during the
37、test. 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 trial run and before exposing the specimens to be tested. Measurements as detailed in Item a) above will also be made to
38、 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 weeks). 8 Recovery At the completion of the test, small specimens, unless otherwise specifi
39、ed by the relevant specification, shall be washed in running tap water for 5 min, rinsed in distilled or demineralized water then shaken by hand or subjected to air blast to remove droplets of water. The temperature of the water used for washing shall not exceed 35 C. If necessary, the relevant spec
40、ification shall detail the methods to be used for washing and drying larger specimens. The specimens shall then be stored under standard recovery conditions for not less than 1 h and not more than 2 h. 9 Final measurements The specimens shall be visually inspected and, if necessary, electrically and
41、 mechanically checked as required by the relevant specification. The results shall be recorded. NOTEPrecautions should be taken to ensure that remains of salt deposit do not impair the reproducibility of the measurements. 10 Test reports Reports on this test shall include information necessary to co
42、mpare 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. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Cop
43、y, (c) BSI BS 2011-2.1Ka:1982 BSI 03-19993 11 Information to be given in the relevant specification a) Initial measurementsClause 5 b) Pre-conditioningClause 6 c) Position of the specimens during the test Sub-clause 7.1 d) Test durationSub-clause 7.6 e) RecoveryClause 8 f) Final measurementsClause 9
44、 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2011-2.1Ka:1982 BSI 03-1999 Publication referred to See national foreword.
45、 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:45:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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