1、CEN EN*ISO*4543 94 3404589 0096743 488 BRITISH STANDARD Metallic and other non-organic coatings - General rules for corrosion tests applicable for storage conditions The European Standard EN IS0 4543 : 1994 has the status of a British Standard BS EN IS0 4543 : 1995 CEN EN*IS0*4543 94 3404589 009b744
2、 314 = BS EN IS0 4543 : 1995 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1995 O BSI 1995 The following BSI references relate to the work on t
3、his standard: Committee reference S”V37 Draft for commeat 78/56506 DC ISBN O 580 23998 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ST1/37, Methods of test for metallic and related coatings including corrosion tests,
4、 upon which the following bodies were represented: Aluminium Federation Aluminium Finishing Association 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 D
5、efence NDT Trade Association Royal Society of Chemistry Society of Motor Manufacturers and Traders Limited Zinc Development Association Amendments issued since publication Amd. No. I Date I Ext affected BS EN IS0 4543 : 1995 Contents Page Committees responsible Inside front cover National foreword i
6、i Fore word 2 O Introduction 3 1 Scope and field of application 3 2 Test specimens 3 3 Operating conditions 4 4 Test procedure 5 5 Test report 6 Annex 7 Types and numerical values of factors characterizing storage conditions i BS EN IS0 4543 : 1995 National foreword This British Standard has been pr
7、epared by Bchnical Committee STI/37 and is the English language version of EN IS0 4543 : 1994 Metallic and other non-organic coatings - General rules for corrosion tests applicable for storage conditiom, published by the European Committee for Standardization (CEN). Compliance with a British Standar
8、d does not of itself confer immunity from legal obligations. ii CEN EN*IS0*4543 94 3404589 ooqwi.17 023 m EUROPEAN STANDARD EN IS0 4543 NORME EUROPENNE EUROPISCHE NORM October 1994 ICs 25.220.30; 25.220.40 Descriptors: Coatings, protective coatings, metal coatings, storage, corrosion tests English v
9、ersion Metallic and other non-organic coatings - General rules for corrosion tests applicable. for storage conditions (IS0 4543 : 1981) Revtements mtalliques et autres revtements non organiques - Directives gnrales pour les essais de corrosion applicables aux conditions de stockage (IS0 4543 : 1981)
10、 Metallische und ander anorganische berzge - Allgemeine Richtlinien fr Korrosionsversuche anwendbar auf Lagerungsbedingungen (IS0 4543 : 1981) This European Standard was approved by CEN on 1994-10-26. CEN members are bound to comply with the CENCENELEC Internal Regulations which stipulate the condit
11、ions 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 exists in three o
12、fficial 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 officiai versions. CEN members are the national standards bodies of Austri
13、a, 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 Secretariat: rue
14、de Stassart 36, B-1050 Brussels O 1994 Copyright reserved to CEN members Ref. No. EN IS0 4543 : 1994 E CEN EN*IS0*4543 94 E 3404589 0096748 TbT m Page 2 EN IS0 4543 : 1994 Foreword This European Standard was taken over by the Technical Committee CEN/TC 262, Protection of metallic materials against c
15、orrosion, from the work of ISO/TC 107, Metallic and other inorganic coatings, of the International Organization for Standardization. CEN/TC 262 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, eit
16、her by publication of an identical text or by endorsement, at the latest by April 1995, and conflicting national standards shall be withdrawn at the latest by April 1995. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria,
17、 Belguim, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. CEN ENaIS0*4543 qy 3404589 009b749 Tb W Page 3 EN IS0 4543 : 1994 Metallic and other non-organic coatings - General rules for corrosion tests ap
18、plicable for storage conditions O Introduction Corrosion testing under storage conditions is carried out in order to : ai assess the corrosion resistance of different protective coatings to environments encountered under particular storage conditions; b) tective coatings; compare the corrosion resis
19、tance of two or more pro- c) determine the type and optimum thickness of a protec- tive coating and type of protective wrapping; d) under laboratory and storage conditions. evaluate the relationship between the results of testing It involves exposure of coated test specimens to the action of corrosi
20、ve factors encountered in storage and periodic observa- tion of the test specimens. The aggressiveness of corrosion in storage rooms depends upon the humidity and temperature of the atmosphere and upon the action of other environmental factors which may either be constant or may vary periodically or
21、 accidentally in a particular microclimate. 1 Scope and field of application This International Standard gives guidance on methods of cor- rosion testing of protective metallic, conversion and other non- organic coatings, with or without additive protection, in heated and unheated storage rooms in a
22、ll microclimates with or without control of climatic parameters. Specimens and articles may be tested separately or in bulk, and with or without protective wrappings. - coated production articles or parts thereof Depending on the purpose of the examinations, specimens may be tested with or without w
23、rappings and 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 than 50 cm2 (5 cm x 10 cm). If the coated articles used ar
24、e smaller than 50 cm2 in area, speamens of the same kind may be combined to total the re- quired 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 a rea. 2.3 Preparation Clean t
25、he test specimens thoroughly 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 con- taminants , but shall not include the use of any abrasives or solvents wh
26、ich may attack the surfaces of the test specimens. However, if testing coatings with additional temporary protec- tive films, do not clean the surface. 2.4 Handling The handling of test specimens prepared for testing (installa- tion on racks, hanging, etc.) shall be carried out with clean, cotton-gl
27、oved hands. 2 Test specimens 2.5 Marking 2.1 Type The following types of test specimen may be used : - tive coating to be tested; specially prepared specimens covered with the protec- Mark the test specimens in such a way that no confusion dur- ing the storage test is possible. Markings should be le
28、gible 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. CEN EN*IS0*4543 94 I 3404589 0096750 618 W Page 4 EN IS0 4543 : 1994 Test Specimens may be marked by one of the
29、following methods : a) applied (preferred method); positional notch coding before the protective coating is bJ stamping appropriate numbers (with a numbering stamp); c) hanging on the test specimen a number plate made of a corrosion-resistant material, hanging free of the specimen and attached by me
30、ans of a loose-fitting, non-metallic thread, for example nylon thread; d) of the test specimen. painting with suitably durable paints on the reverse side Numbers should preferably be marked on the front (test) side of the test specimens, at their bottom edge. The holes on which number plates are hun
31、g 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. Mark test specimens with figures and lette
32、rs so that the follow- ing information is indicated : a) the type of coating; bJ the type of wrapping or packaging; CI the type of temporary protective coating, if any; dJ a serial number; e) the place and conditions of storage. The markings should be minimized, preferably by using a sim- ple code t
33、hat enables them to be associated with the inforrna- tion required (see clause 5). 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 physical property and the number ex- pected to be removed for e
34、xamination during the period of ex- posure. 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 least 50 cm2. If the specimens have smaller-surface areas, take a correspondingly greater number of test spec
35、imens. 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 assess the prevailing corrosive conditions. Therefore,
36、 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 in 2.8. 2.8 Storage Store the test specimens before exposure in a clean, dry at- mosphere in
37、 an air-conditioned, temperature-controlled room with a relative humidity of 50 YO or less, or sealed in a desic- cator, or by sealing the specimens into evacuated plastics bags containing a desiccant. 3 Operating conditions 3.1 Corrosion environment Select the test conditions bearing in mind that t
38、he data ob- tained 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 corro- sion factors indigeneous to the storage room where testing is to be carried out. The factors affe
39、cting corrosion vary with the nature of the material being tested and may include any or all of the follow- ing : a) atmospheric humidity and its fluctuations; bJ air temperature and its fluctuations; c) atmospheric pollution, both chemical (such as the presence of gases and vapours) and physical (s
40、uch as dust, smoke and foreign matter); di value of, and the fluctuations in, the temperature of the test specimens; e) quality of surface cleaning of the test specimens; f) exposure to bioiogical species; gJ with the surface of the specimen; corrosive properties of the materials in direct contact h
41、) type and quality of the packaging and its irnper- viousness. 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 of the storage room, for example on
42、shelves. It is advisable to separate off the exposure site in order to avoid damaging the test specimens, but without affecting the environmental con- ditions. The location of the test specimens should be such that none of them will be unduly influenced by local heat sources, vents, cir- culating fa
43、ns, etc. CEN ENUISOU4543 94 W 3404589 0076753 554 Page 5 EN IS0 4543 : 1994 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 shelv
44、es, racks and frames is not specified, 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 t
45、he shelves, racks and frames should : a) rosive action on the test specimens; be made of corrosion-resistant material that has no cor- b) if made of wood, have a moisture content of not more than 15 % and not emit vapours of corrosive organic com- pounds: c) and movement of the test specimens; be se
46、cured so as to prevent undesirable displacement 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 than 0,5 m from the roof; e) if made of wood, be designed so as to minimize the effect of wood pres
47、ervatives on metals and temporary pro- tectives. 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 b
48、oxes. The following measuring instruments may be used to record the exoosure conditions : a) absolute and relative humidities; hygrothermograph, to record the temperature and the b) instruments to determine and record the sulphur diox- ide content and the degree of pollution of the atmosphere by dus
49、t and chloride ions. 3.2.4 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 pro- tective 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 con
