1、BRITISH STANDARD BS EN ISO 4536:1995 Incorporating Amendment No. 1 Metallic and non-organic coatings on metallic substrates Saline droplets corrosion test (SD test) The European Standard EN ISO4536:1994has the status of a British StandardBSENISO4536:1995 This British Standard, having been prepared u
2、nder the directionof the Surface Coatings (other than Paints) Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 31December1986 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference SRC/15 Draft for comment 76/54
3、496 DC ISBN 0 580 15579 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Surface Coatings (other than Paints) Standards Committee (SRC/-) to Technical Committee SRC/15, upon which the following bodies were represented: Aluminium Federat
4、ion Association of Manufacturers of Domestic Electrical Appliances British Anodising Association British Industrial Fasteners Federation Electronic Engineering Association Institute of Metal Finishing Metal Finishing Association Ministry of Defence NDT Trade Association Society of Motor Manufacturer
5、s and Traders Limited Telecommunication Engineering and Manufacturing Association (TEMA) Zinc Development Association Amendments issued since publication Amd. No. Date of issue Comments 8477 July 1995 Indicated by a sideline in the marginBSENISO4536:1995 BSI 03-2000 i Contents Page Committees respon
6、sible Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 3 Principle 3 4 Test solution 3 5 Apparatus 4 6 Test specimens 4 7 Method of exposure of test specimens 4 8 Procedure 5 9 Duration of tests 5 10 Treatment of test specimens aft
7、er test 5 11 Evaluation of results 5 12 Test report 5 Annex ZA (normative) Normative references to international publications with their relevant European publications 8 Figure 1 Hand-operated atomizer 6 Figure 2 Photographs illustrating the intensity of spraying required (actual size) 7 Table Compo
8、sition of test solution 4 Publications referred to Inside back coverBSENISO4536:1995 ii BSI 03-2000 National foreword This Part of BS5466 has been prepared under the direction of the Surface Coatings (other than Paints) Standards Committee. It is identical with ISO4536:1985 “Metallic and non-organic
9、 coatings on metallic substrates Saline droplets corrosion test (SD test)”, which has been prepared, with the active participation of the UnitedKingdom, by Subcommittee107, Metallic and other non-organic coatings, of the International Organization for Standardization (ISO). It is intended to publish
10、 further Parts as the international work progresses. In 1994 the European Committee for Standardization (CEN) accepted ISO4536:1985 as European Standard ENISO4536:1994. As a consequence of implementing the European Standard this British Standard is renumbered as BSENISO4536:1995 and any reference to
11、 BS5466-9 should read as a reference to BSENISO4536:1995. Terminology and conventions. The text of the International 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 S
12、tandards; attention is drawn especially to the following. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Part of BS5466”. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the basel
13、ine as the decimal marker. In British Standards it is current practice to use the symbol “L” for litre rather than “l”, and to use the spelling “sulphur” etc., instead of “sulfur”, etc. The Technical Committee has reviewed the provisions of ISO483:1966, to which reference is made in5.1, and has deci
14、ded that it is acceptable for use in conjunction with this standard. The British Standard related to ISO483 is BS3718:1964 “Laboratory humidity ovens (non-injection type)”. When used as described in5.1, BS3718 will give the same results as ISO483 and is therefore suitable for use in this connection.
15、 The Technical Committee has also reviewed the provisions of ISO1462:1973, to which reference is made in clause11, and has decided that it is acceptable for use in conjunction with this standard. The British Standard related to ISO1462 is BS3745:1970 “The evaluation of results of accelerated corrosi
16、on tests on metallic coatings”. When used as described in clause9, BS3745 will give the same results as ISO1462 and is therefore suitable for use in this connection. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible
17、for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 4540:1980 BS 5466 Methods for corrosion testing of metallic coatings Part 6:1982 Rating of results o
18、f corrosion testing on electroplated coatings cathodic to the substrate (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENISOtitle page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright da
19、te) 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 ISO 4536 January 1995 ICS 25.220.30; 25.220.40 Descriptors: Coatings, metal coatings, substrates, metals, tests, corrosion tests
20、English version Metallic and non-organic coatings on metallic substrates Saline droplets corrosion test (SD test) (ISO 4536:1985) Revtements mtalliques et non organiques sur bases mtalliques Essai de corrosion aux gouttelette salines (Essai SD) (ISO4536:1985) Metallische und anorganische berzuge auf
21、 metallischen Grundwerkstoffen Salztrpchen-Korrosionsprfung (SD-Versuch) (ISO4536:1985) This European Standard was approved by CEN on1994-10-03. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a
22、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 official versions (English, French, German). A version i
23、n 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 bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece,
24、Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved
25、to CEN members Ref. No. EN ISO 4536:1995 EENISO4536:1995 2 BSI 03-2000 Foreword This European Standard has been taken over by the Technical Committee CEN/TC262, Protection of metallic materials against corrosion, from the work of ISO/TC107, Metallic and other inorganic coatings, of the International
26、 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 of an identical text or by endorsement, at the latest by July1995, and
27、 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
28、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom.ENISO4536:1995 BSI 03-2000 3 0 Introduction 0.1 This test differs significantly from that specified in ISO3768, Metallic coatings Neutral salt spray test (NSS test), although the fields of application of the two tests ar
29、e similar and their results are often comparable. In the saline droplets corrosion test, a pattern of discrete droplets is produced by spraying the specified test solution on to the surfaces being tested. 0.2 The droplets test may therefore have advantages for testing some conversion coatings which
30、may, in continuous leaching, undergo changes which do not occur in their usual conditions of service. For some applications, the droplets test may be more severe than the continuous spray test since the corrosion processes in static drops may cause more intense local action than that produced by a c
31、ontinuous moving moisture film. The method has advantages in needing only simple, easily controlled apparatus and in being applicable to articles of complex shape. 0.3 The method of corrosion by a pattern of discrete droplets has been used with several solutions for tests intended to assess the resi
32、stance of a coating to particular environments. Only one test solution is specified in this International Standard. It contains the major mineral constituents of sea-water and has advantages in that droplets of the solution do not easily dry out and that, for some purposes, simulation of the effects
33、 of sea-spray may be useful. However, other solutions may be given in specifications for materials and products. 0.4 In many instances, there is no direct relation between the results of an accelerated corrosion test and the resistance to corrosion in other media, because several factors which influ
34、ence the progress of corrosion, such as the formation of protective films, vary greatly with the conditions encountered. The results obtained in the test should not, therefore, be regarded as a direct guide to the corrosion resistance of the tested materials in all environments where these materials
35、 may be used. Furthermore, performance of different materials in the test cannot always be taken as a direct guide to the relative corrosion resistance of these materials in service. 1 Scope and field of application 1.1 This International Standard specifies the test solution, the apparatus and the p
36、rocedure for a saline droplets corrosion test for assessment of the quality of metallic and non-organic coatings, made in accordance with the requirements of coating or product specifications on metallic substrates. 1.2 The method of test specified is suitable for detecting defects and discontinuiti
37、es in metal coatings cathodic to the underlying metal. It is also suitable for chemical or electrochemical conversion coatings such as those obtained by chromate and phosphate treatments. The method is not suitable for testing coatings intended for the more severe types of service. 1.3 The type and
38、number of test specimens, the exposure periods to be used for a particular product and the interpretation of results are not specified in this International Standard. Such details should be given in the appropriate materials or coating specification. 2 References ISO 483, Plastics Small enclosures f
39、or conditioning and testing at relative humidities maintained by aqueous solutions. 1) ISO 1462, Metallic coatings Coatings other than those anodic to the basis metal Accelerated corrosion tests Method for the evaluation of the results. ISO 4540, Metallic coatings Coatings cathodic to the substrate
40、Rating of electroplated test specimens subjected to corrosion tests. 3 Principle Spraying of the test specimens with a neutral salt solution, storing in conditions of high humidity, respraying only when it is needed to maintain the pattern of droplets. NOTEThe regular flow of new solution over the s
41、urfaces under test, such as occurs in the continuous salt spray test, does not take place. 4 Test solution (see the Table) Using only reagents of recognized analytical grade and only distilled or demineralized water of pH 6,5 to 7,2, prepare a solution, the composition of which is given in the Table
42、. 1) At present at the stage of draft. (Revision of ISO/R 483:1966.)ENISO4536:1995 4 BSI 03-2000 Table Composition of test solution Filter the solution before use in order to remove any solid matter which might block the aperture of the spraying device. 5 Apparatus 5.1 Cabinet or other suitable cont
43、ainer, in which the test specimens are exposed to air with relative humidity in the range 85% to 95% at 23 3 C. The cabinet may be of any suitable shape and dimensions. It shall be made of a corrosion-resistant material (for example glass or plastics) so as to prevent the formation of corrosion prod
44、ucts which might contaminate the test specimens. The required relative humidity may be produced and maintained within the cabinet by placing on its base an open vessel containing water or a saturated solution of salts (for example potassium chloride or potassium nitrate) which will not influence the
45、 corrosion process, or by any other convenient means (seeISO483). Other conditions of temperature and humidity may be used by agreement between the parties concerned. In this case, the agreed test conditions shall be described in the test report. 5.2 Stand(s) or support(s), to hold the test specimen
46、s, made from non-metallic materials resistant to corrosion by the test solution (for example glass or plastics). 5.3 Means of producing a spray of fine droplets, comprising a container for the test solution, fitted with a suitable atomizing nozzle and provided with means of generating sufficient pre
47、ssure to deliver spray from the nozzle. NOTE 1A suitable design of hand-operated atomizer is shown in Figure 1. Alternatively, a glass chromatographic spray-head is satisfactory for use in producing these fine droplets; suitable spray-heads of this type are available commercially. NOTE 2The compress
48、ed air used for spraying shall be thoroughly filtered and free from traces of oil. 6 Test specimens 6.1 Select the number and type of test specimens, their shape and their dimensions according to the specification for the product or coating being tested. NOTEThe simultaneous exposure of control spec
49、imens for which the correlation between the test and service life has been established is often useful. 6.2 Unless otherwise specified, clean the test specimens before testing. Choose the method of cleaning appropriate to the nature of the surface and of the contaminants. Do not use abrasives on conversion coatings; for metallic coatings, the only permitted abrasive is a paste of pure magnesium oxide. Do not use solvents that are corrosive or which may deposit either corrosion-promoting or protective films. Take care to ensure that the
