BS EN ISO 7384-1995 Corrosion tests in artificial atmospheres General requirements《模拟大气腐蚀试验 一般要求》.pdf

1、BRITISH STANDARD BS EN ISO 7384:1995 Corrosion tests in artificial atmospheres General requirements The European Standard EN ISO 7384:1995 has the status of a British StandardBSENISO7384:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published

2、 underthe authority of the Standards Board and comes intoeffect on 15July1995 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ISE/NFE/8 Draft announced in BSI News June 1993 ISBN 0 580 24040 1 Committees responsible for this British Standard The prep

3、aration of this British Standard was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys, upon which the following bodies were represented: AEA Technology Aluminium Federation British Gas plc British Non-Ferrous Metals Federation British Iron and Steel Producers Association De

4、partment of Trade and Industry (National Physical Laboratory) Department of Transport (Transport Research Laboratory) Electricity Association Institute of Corrosion Ministry of Defence Society of Chemical Industry Welding Institute Zinc Development Association Amendments issued since publication Amd

5、. No. Date CommentsBSENISO7384:1995 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope and field of application 3 2 References 3 3 Definition 3 4 Principle 3 5 Requirements for test specimens 4 6 Requirements for apparatus 4 7 Preparation of

6、 test specimens 5 8 Procedure 6 9 Evaluation of test results 6 10 Test report 7 Annex ZA (normative) Normative references to international publications with their relevant European publications 8 List of references Inside back coverBSENISO7384:1995 ii BSI 09-1999 National foreword This British Stand

7、ard has been prepared by Technical Committee ISE/NFE/8 and is the English language version of EN ISO7384:1995 Corrosion test in artificial atmosphere General requirements published by the European Committee for Standardization (CEN). It is identical with ISO7384:1986, published by the International

8、Organization for Standardization (ISO). It supersedes BS6917:1987 which is withdrawn. 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. Compliance with a British Standard does not of it

9、self confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard BS 5466 Methods for corrosion testing of metallic coatings ISO 4536:1985 Metallic and non-organic coatings on metallic substrates Saline droplets corrosion test (SD test) Part 9. Sali

10、ne droplets corrosion test (SD test) ISO 4540:1980 Metallic coatings Coatings cathodic to the substrate Rating of electroplated test specimens subjected to corrosion tests Part 6:1982 Rating of results of corrosion tests on electroplated coatings cathodic to the substrate Summary of pages This docum

11、ent comprises a front cover, an inside front cover, pagesi andii, theEN ISO title page, pages2to8, 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 co

12、ver.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7384 January 1995 ICS 77.060 Descriptors: Metals, alloys, metal coatings, non metal coatings, tests, corrosion tests, laboratory tests English version Corrosion test in artificial atmosphere General requirements (ISO 7384:1986) Essais de c

13、orrosion en atmosphre artificielle Prescriptions gnrales (ISO 7384:1986) Korrosionsprfungen in knstlicher Atmosphre Allgemeine Anforderungen (ISO 7384:1986)This European Standard was approved by CEN on 1994-10-03. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipul

14、ate the conditions for giving this European Standard the status 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 CEN member. This European Standard exi

15、sts in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bo

16、dies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Sec

17、retariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref. No. EN ISO 7384:1995 EENISO7384:1995 BSI 09-1999 2 Foreword This European Standard has been taken over by the Technical Committee CEN/TC 262, Protection of metallic materials against corrosion, from the work of

18、 ISO/TC 107, Metallic and other inorganic coatings, of the International Organization for Standardization (ISO). This document was submitted to the formal vote and was adopted by CEN as a European Standard. This European Standard shall be given the status of a national standard either by publication

19、 of an identical text or by endorsement, at the latest by July1995, and conflicting national standards shall be withdrawn at the latest by July1995. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denma

20、rk, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.ENISO7384:1995 BSI 09-1999 3 1 Scope and field of application This International Standard specifies general requirements for the specimens, appa

21、ratus and procedure of corrosion tests in artificial atmospheres. It applies to metals and alloys with and without permanent corrosion protection or temporary corrosion protection. The requirements specified in this International Standard are intended for application in other International Standards

22、 dealing with corrosion tests in artificial atmospheres as well as in accelerated methods of test and the construction of new chambers. 2 References ISO 1456, Metallic coatings Electroplated coatings of nickel plus chromium. ISO 1458, Metallic coatings Electroplated coatings of nickel. ISO 1461, Met

23、allic coatings Hot dip galvanized coatings on fabricated ferrous products Requirements. ISO 1462, Metallic coatings Coatings other than those anodic to the basis metals Accelerated corrosion tests Method for the evaluation of the results. ISO 2081, Metallic coatings Electroplated coatings of zinc on

24、 iron or steel. ISO 2082, Metallic coatings Electroplated coatings of cadmium on iron or steel. ISO 3768, Metallic coatings Neutral salt spray test (NSS test). ISO 3769, Metallic coatings Acetic acid salt spray test (ASS test). ISO 3770, Metallic coatings Copper accelerated acetic acid salt spray te

25、st (CASS test). ISO 4536, Metallic and non-organic coatings on metallic substrates Saline droplets corrosion test (SD test). ISO 4540, Metallic coatings Coatings cathodic to the substrate Rating of electroplated test specimens subjected to corrosion tests. ISO 4623, Paints and varnishes Filiform cor

26、rosion test on steel. ISO 8407, Metals and alloys Procedures for removal of corrosion products from corrosion test specimens 1) . 3 Definition For the purpose of this International Standard, the following definition applies. corrosion tests in artificial atmospheres laboratory tests conducted in air

27、, in the presence of intensifying factors influencing corrosion of metallic materials and alloys with and without permanent or temporary corrosion protection NOTECorrosion tests in artificial atmospheres attempt to reproduce corrosion effects under service conditions, such as atmospheric or other en

28、vironments. 4 Principle 4.1 Acceleration of the processes is achieved by intensifying such factors as temperature, relative humidity, condensation of the moisture and corrosive agents (sulfur dioxide, chlorides, acids, ammonia, hydrogen sulfide, etc.). 4.2 The following shall be specified in the tes

29、t programme: the purpose of the test; the nature of the tested metals, alloys or means of corrosion protection (chemical composition, thickness, state of the specimen surface); the method of test: operating conditions, total duration of the test, position and eventually permutation of the test speci

30、mens, frequency of removal and examination of specimens during the test, number of specimens removed and number of control specimens; the calibration of the corrosivity of the atmosphere of the test chamber regardless of specimen orientation in the chamber; the criteria and methods of evaluation of

31、the test results. 4.3 The tests can be classified as follows: a) enhanced environment tests in which the conditions are chosen to duplicate the corrosion mechanism in service conditions, but at an accelerated rate. Tests of this type allow the prediction of long-term corrosion of metals, alloys and

32、means of corrosion protection; b) short-term corrosion tests in which the corrosive environment is chosen to produce accelerated corrosion. Tests of this type allow comparison of corrosion resistance of similar corrosion protection if this has been shown to be valid by practical experience for the s

33、pecific environment; 1) At present at the stage of draft.ENISO7384:1995 4 BSI 09-1999 c) rapid quality control tests in which the corrosive environment is chosen to produce abnormally accelerated corrosion. Tests of this type allow rapid determination of defects and weak points in the corrosion prot

34、ection. The classification of a specific test is dependent on the material tested. 5 Requirements for test specimens 5.1 Irrespective of the method used, all tests shall be carried out using specimens treated or coated in the same way and having the same shape, dimensions and surface roughness. 5.2

35、The shape and dimensions of the test specimens shall be chosen according to the test method, criteria and methods of evaluation of the test results. The thickness of the test specimens shall be preferably between0,5 and3mm; and in any case, be such that they are not deformed during the test. If nece

36、ssary, production articles or their parts with shapes which do not cause difficulties in the evaluation of the test results, may be used as test specimens. In order to exclude, as far as possible, the effect of irregularities the total surface area of the test specimen shall be as large as possible

37、and not less than25cm 2 , except where smaller surface areas are specified in special test regulations. 5.3 The surface roughness of a test specimen shall be specified in the test programme. 5.4 The surface of test specimens of metals and alloys shall be free from visible defects, such as scratches,

38、 inclusions, cracks, pits and porosity. Cut edges should have no burrs. 5.5 The coatings of test specimens shall meet all the requirements of the appropriate International Standards, for example ISO1456, ISO1458, ISO1461, ISO2081, ISO2082. 5.6 If test specimens are cut from a larger coated article,

39、the cutting shall be carried out in such a way as to limit the amount of damage in the area adjacent to the cut. 5.7 While preparing test specimens in which there is a welded joint, the joint shall be placed in the centre of the test specimen parallel to its longest side. 5.8 The cut edges of the te

40、st specimens shall be protected with a suitable coating stable in the chosen corrosive environment; the coating used during testing may be, for example, paint, varnish, wax, tape or enamel. Cut edges shall be left unprotected when the influence of unprotected edges on the corrosion is to be examined

41、. 5.9 The test specimens should be identified. Marking shall be legible and durable over the whole period of testing and shall not have an effect on the test results. 5.10 Control specimens, intended for comparison with the specimens to be removed, shall be stored over the total period of testing un

42、der conditions which prevent corrosion. The conditions shall be specified in the test programme. 5.11 The number of test specimens required is governed by the total duration of the test, the frequency of removal and examination of specimens during the test, the number of test specimens tested and th

43、e number of control specimens specified in the test programme. 5.12 The number of replicate specimens shall be not fewer than three; there shall be at least one control specimen. 6 Requirements for apparatus 6.1 The tests are carried out in special chambers or cabinets which shall be large enough to

44、 assure homogeneous distribution and uniform conditions. The upper parts of the chambers shall be so shaped that drops of moisture or sprayed solution accumulated on them do not fall on the specimens being tested. 6.2 The apparatus shall maintain the specified operating conditions within the exposur

45、e zone of the chamber for the complete duration of the test. 6.3 The specified operating conditions shall be controlled. Values of temperature and relative humidity shall be recorded automatically, except in the case of condensation tests. The concentration of corrosive agents shall be recorded auto

46、matically or determined periodically. 6.4 It is not recommended to use the same chamber for testing different corrosive agents. 6.5 The testing of specimens protected with volatile inhibitors shall be carried out in special chambers intended for this purpose in which traces of volatile inhibitors fr

47、om previous tests have been removed. 6.6 The inside surfaces of parts of chambers, gaskets for hatches and doors, communication equipment and apparatus, devices for testing the test specimens, which are in contact with corrosive agents shall be made of materials that are resistant to the corrosive t

48、est atmosphere. 6.7 If necessary, a system of air circulation shall be installed in order to provide uniform operating conditions throughout the chamber. 6.8 The temperature inside the chamber shall be capable of increasing at a rate of at least 1 C/min upon startup.ENISO7384:1995 BSI 09-1999 5 6.9

49、The specified relative humidity inside the chamber shall be produced by means of a supply of humidified air. For humidification purposes, only distilled or deionized water shall be used. It is not permissible to produce the specified relative humidity inside the chamber by means of salt solutions, as these may influence the corrosion state of the test specimens. 6.10 The time required, from startup, to reach the specified relative humidity inside the chamber shall be not more than1h. 6.11 The temperature