1、BRITISH STANDARD BS EN ISO 4543:1995 Metallic and other non-organic coatings General rules for corrosion tests applicable for storage conditions The European Standard EN ISO4543:1994 has the status of a BritishStandardBSENISO4543:1995 This BritishStandard, having been prepared under the directionof
2、the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 June1995 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference STI/37 Draft for comment78/56506DC ISBN 0 580 23998 5 Committees re
3、sponsible for this BritishStandard The preparation of this BritishStandard was entrusted to Technical Committee STI/37, Methods of test for metallic and related coatings including corrosion tests, upon which the following bodies were represented: Aluminium Federation Aluminium Finishing Association
4、Department of Trade and Industry (National Physical Laboratory) Federation of the Electronics Industry Institute of Corrosion Institute of Metal finishing Metal Finishing Association Ministry of Defence NDT Trade Association Royal Society of Chemistry Society of Motor Manufacturers and Traders Limit
5、ed Zinc Development Association Amendments issued since publication Amd. No. Date CommentsBSENISO4543:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 Test specimens 3 3 Operating conditio
6、ns 4 4 Test procedure 5 5 Test report 6 Annex Types and numerical values of factors characterizing storage conditions Inside back coverBSENISO4543:1995 ii BSI 01-2000 National foreword This BritishStandard has been prepared by Technical Committee STI/37 and is the English language version of EN ISO4
7、543:1994 Metallic and other non-organic coatings General rules for corrosion tests applicable for storage conditions, published by the European Committee for Standardization (CEN). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a
8、re 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, pagesi andii, theEN ISO title page, pages2 to6, an inside back cover and a back c
9、over. 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO4543 October1994 ICS25.220.30; 25.220.40 Descriptors: Coatings, protecti
10、ve coatings, metal coatings, storage, corrosion tests English version Metallic and other non-organic coatings General rules forcorrosion tests applicable for storage conditions (ISO4543:1981) Revtements mtalliques et autres revtementsnon organiques Directives gnrales pour les essais de corrosion app
11、licables aux conditions de stockage (ISO4543:1981) Metallische und ander anorganische berzge Allgemeine Richtlinien fr Korrosionsversuche anwendbar auf Lagerungsbedingungen (ISO4543:1981) This European Standard was approved by CEN on1994-10-26. CEN members are bound to comply with the CEN/CENELEC In
12、ternal Regulations which stipulate 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 mem
13、ber. This European Standard exists 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 member
14、s are the national standards bodies 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
15、 Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN ISO4543:1994EENISO4543:1994 BSI 01-2000 2 Foreword This European Standard was taken over by the Technical Committee CEN/TC262, Protection of metallic materials against corr
16、osion, from the work of ISO/TC107, Metallic and other inorganic coatings, of the International Organization for Standardization. CEN/TC262 had decided to submit the final draft for Formal Vote. The result was positive. This European Standard shall be given the status of a national standard, either b
17、y publication of an identical text or by endorsement, at the latest by April1995, and conflicting national standards shall be withdrawn at the latest by April1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgi
18、um, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.ENISO4543:1994 BSI 01-2000 3 0 Introduction Corrosion testing under storage conditions is carried out in order to: a) assess the corrosion resistance o
19、f different protective coatings to environments encountered under particular storage conditions; b) compare the corrosion resistance of two or more protective coatings; c) determine the type and optimum thickness of a protective coating and type of protective wrapping; d) evaluate the relationship b
20、etween the results of testing under laboratory and storage conditions. It involves exposure of coated test specimens to the action of corrosive factors encountered in storage and periodic observation of the test specimens. The aggressiveness of corrosion in storage rooms depends upon the humidity an
21、d temperature of the atmosphere and upon the action of other environmental factors which may either be constant or may vary periodically or accidentally in a particular microclimate. 1 Scope and field of application This International Standard gives guidance on methods of corrosion testing of protec
22、tive metallic, conversion and other non-organic coatings, with or without additive protection, in heated and unheated storage rooms in all microclimates with or without control of climatic parameters. Specimens and articles may be tested separately or in bulk, and with or without protective wrapping
23、s. 2 Test specimens 2.1 Type The following types of test specimen may be used: specially prepared specimens covered with the protective coating to be tested; coated production articles or parts thereof. Depending on the purpose of the examinations, specimens may be tested with or without wrappings a
24、nd with or without temporary protective films. 2.2 Shape and dimensions To minimize edge effects and to obtain representative corrosion, the surface area of the test specimens should be as large as possible and in any case not less than50cm 2 (5cm 10cm). If the coated articles used are smaller than5
25、0cm 2in area, specimens of the same kind may be combined to total the required minimum surface area, but the results obtained will not necessarily be strictly comparable with those obtained on specially prepared test specimens of the specified minimum area. 2.3 Preparation Clean the test specimens t
26、horoughly before exposure to remove any contaminants that may affect the performance of the coating system being tested. The cleaning method to be employed depends upon the nature of the surface and the contaminants, but shall not include the use of any abrasives or solvents which may attack the sur
27、faces of the test specimens. However, if testing coatings with additional temporary protective films, do not clean the surface. 2.4 Handling The handling of test specimens prepared for testing (installation on racks, hanging,etc.) shall be carried out with clean, cotton-gloved hands. 2.5 Marking Mar
28、k the test specimens in such a way that no confusion during the storage test is possible. Markings should be legible and durable over the whole period of testing and should be made on those areas of the test specimens that are not subjected to visual assessment and that have no functional purpose. T
29、est specimens may be marked by one of the following methods: a) positional notch coding before the protective coating is applied (preferred method); b) stamping appropriate numbers (with a numbering stamp); c) hanging on the test specimen a number plate made of a corrosion-resistant material, hangin
30、g free of the specimen and attached by means of a loose-fitting, non-metallic thread, forexamplenylon thread; d) painting with suitably durable paints on the reverse side of the test specimen. Numbers should preferably be marked on the front (test) side of the test specimens, at their bottom edge. T
31、he holes on which number plates are hung should be situated near the bottom edge of the specimen so that the plate itself cannot come into direct contact with either the test specimen to which the plate is attached or with neighbouring test specimens after they have been positioned in the frame.ENIS
32、O4543:1994 4 BSI 01-2000 Mark test specimens with figures and letters so that the following information is indicated: a) the type of coating; b) the type of wrapping or packaging; c) the type of temporary protective coating, if any; d) a serial number; e) the place and conditions of storage. The mar
33、kings should be minimized, preferably by using a simple code that enables them to be associated with the information required (seeclause5). 2.6 Number Select the number of test specimens in any one series of tests according to the type of specimen, the number required to evaluate a particular physic
34、al property and the number expected to be removed for examination during the period of exposure. The number of test specimens of each type used for a given evaluation should not be less than three for test specimens having a surface area of at least50cm 2 . If the specimens have smaller surface area
35、s, take a correspondingly greater number of test specimens. 2.7 Standard specimens It is desirable that standard test specimens of solid metals, for example zinc, copper or low alloy steel, should be included alongside the test specimens of the coating system being examined, in order to be able to a
36、ssess the prevailing corrosive conditions. Therefore, such metals should be chosen from those for which data concerning performance in a variety of storage rooms have been established. The standard test specimens should be stored under the conditions specified in2.8. 2.8 Storage Store the test speci
37、mens before exposure in a clean, dry atmosphere in an air-conditioned, temperature-controlled room with a relative humidity of50% or less, or sealed in a desiccator, or by sealing the specimens into evacuated plastics bags containing a desiccant. 3 Operating conditions 3.1 Corrosion environment Sele
38、ct the test conditions bearing in mind that the data obtained for a given set of test specimens should correspond with, or be similar to, the actual conditions of use or storage of metals, coatings or articles. Before exposure, assess the corrosion factors indigeneous to the storage room where testi
39、ng is to be carried out. The factors affecting corrosion vary with the nature of the material being tested and may include any or all of the following: a) atmospheric humidity and its fluctuations; b) air temperature and its fluctuations; c) atmospheric pollution, both chemical (such as the presence
40、 of gases and vapours) and physical (such as dust, smoke and foreign matter); d) value of, and the fluctuations in, the temperature of the test specimens; e) quality of surface cleaning of the test specimens; f) exposure to biological species; g) corrosive properties of the materials in direct conta
41、ct with the surface of the specimen; h) type and quality of the packaging and its imperviousness. The recommended methods and frequency of monitoring these factors are given in the Annex. 3.2 Storage room and method of exposure 3.2.1 Location The test specimens should be placed in particular areas o
42、f the storage room, for example on shelves. It is advisable to separate off the exposure site in order to avoid damaging the test specimens, but without affecting the environmental conditions. The location of the test specimens should be such that none of them will be unduly influenced by local heat
43、 sources, vents, circulating fans,etc. The exposure site should be chosen so that it provides the storage conditions to be evaluated. Storage room floors should be covered with a dust absorbing substance. 3.2.2 Shelves, racks and frames The structure of the shelves, racks and frames is not specified
44、, but the following requirements should be observed. Wrapped test specimens should be placed on shelves and frames, while bare specimens should be fixed in frames and placed in racks to enable a larger number of test specimens to be exposed. The construction of the shelves, racks and frames should:
45、a) be made of corrosion-resistant material that has no corrosive action on the test specimens; b) if made of wood, have a moisture content of not more than15% and not emit vapours of corrosive organic compounds; c) be secured so as to prevent undesirable displacement and movement of the test specime
46、ns;ENISO4543:1994 BSI 01-2000 5 d) be designed in such a way that, unless otherwise specified, the test specimens placed on them are as far away from the floor as possible and not less than0,5m from the roof; e) if made of wood, be designed so as to minimize the effect of wood preservatives on metal
47、s and temporary protectives. 3.2.3 Measuring instruments Instruments should be positioned and operated in accordance with their service and maintenance instructions. If testing packaged specimens, it is advisable to measure the internal and external humidities, particularly for boxes. The following
48、measuring instruments may be used to record the exposure conditions: a) hygrothermograph, to record the temperature and the absolute and relative humidities; b) instruments to determine and record the sulphur dioxide content and the degree of pollution of the atmosphere by dust and chloride ions. 3.
49、2.4 Exposure of test specimens in storage rooms The test specimens should be exposed under actual conditions of storage that will be experienced. If the test specimens are production articles coated with protective agents and/or are wrapped or packaged, position them in accordance with the generally accepted manner of storing such articles. Place the test specimens in such a way that: a) contact does not occur either between individual test specimens or between the test specimens and any material that would affect their corrosion under the test conditions
