1、BRITISH STANDARD Paints and varnishes Determination of resistance to rilirorm corrosion Part 1: Steel substrates The European Standard EN IS0 4623-1:2002 has the status of a British Standard ICs 87.040 BS EN IS0 4623-1 12002 BS 3900-Fl3: 2002 Incorporating Corrigendum No. I Wk present to the respons
2、ible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its s
3、ecretary. Cr oss-r e fer enc e s The British Standards which implement international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalog
4、ue. 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 itself confer immunity from legal obligations. Summary of pages This document compri
5、ses a front cover, an inside front cover, the EN IS0 title page, the EN IS0 foreword page, the IS0 title page, pages ii tov, a blank page, pages 1 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments is
6、sued since publication Amd. No. I Date I Comments O BSI 2 April 2002 ISBN O 580 39016 O EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 4623-1 January 2002 ICs 87.040 English version Paints and varnishes - Determination of resistance to filiform corrosion - Part 1 : Steel substrates (IS0 46
7、23-1 :2000) Peintures et vernis - Dtermination de la rsistance la corrosion filiforme - Partie 1: Subjectiles en acier (IS0 4623-1 :2000) Beschichtungsstoffe - Bestimmung der Bestndigkeit gegen Filiformkorrosion -Teil 1: Stahl als Substrat (IS0 4623-1 :2000) This European Standard was approved by CE
8、N on 27 December 2001 CEN members are bound to comply with the CENKENELEC Internal 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
9、 may be obtained on application to the Management Centre or to any CEN member. 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 Ma
10、nagement Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United
11、 Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 4623-1
12、:2002 E EN IS0 4623-12002 I CORRECTED 2002-03-13 I Foreword The text of the International Standard from Technical Committee ISO/TC 35 “Paints and varnishes“ of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 139 “Paint
13、s and varnishes“, the secretariat of which is held by DIN. 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 July 2002, and conflicting national standards shall be withdrawn at the latest by July 20
14、02. This document supersedes EN IS0 4623:1995. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Irelan
15、d, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 4623-1 :2000 has been approved by CEN as a European Standard without any modifications. NOTE Normative references to Internatio
16、nal Standards are listed in annex ZA (normative). INTERNATIONAL STANDARD EN IS0 4623-12002 IS0 4623-1 First edition 2000-09-15 Paints and varnishes - Determination of resistance to filiform corrosion - Part 1: Steel substrates Peintures et vernis - Dtermination de la rsistance la corrosion filiforme
17、 - Partie I: Subjectiles en acier Reference number IS0 4623-1 :2000(E) o os1 2000 II EN IS0 4623-12002 Contents Page Scope . Normative references . Term and definition . . Sampling . Apparatus . Reagents Test panels . 10 Procedure . 11 12 Precision 13 Test report Evaluation of the degree of filiform
18、 corrosion Ann exes A Required supplementary information B Guidance notes on maintaining exposure conditions using saturated ammonium sulfate solution 1 1 2 2 2 2 2 2 3 3 5 5 5 6 7 . 111 EN IS0 4623-12002 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of
19、national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical com- mittees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. In
20、ternational organizations, governmental and non-governmental, in liai- son with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance wit
21、h the rules given in the ISOAEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to
22、 the possibility that some of the elements of this part of IS0 4623 may be the subject of patent rights. IS0 shall not be held responsible for identifying any or all such patent rights. International Standard IS0 4623-1 was prepared by Technical Committee ISO/TC 35, faints and varnishes, Sub- commit
23、tee SC 9, General test methods for paints and varnishes. This first edition of IS0 4623-1 cancels and replaces IS0 4623:1984, of which it constitutes a minor technical revi- sion. IS0 4623 consists of the following parts, under the general title faints and varnishes - Determination of resistance to
24、filiform corrosion : - fart I: Steel substrates - fart 2: Aluminium substrates Annex A forms a normative part of this part of IS0 4623. Annex B is for information only. iv EN IS0 4623-12002 I n t ro d u ct i o n A scribed mark cut through a coating of paints or varnishes on steel can give rise to fi
25、liform corrosion. This corrosion tends to develop when the relative humidity is high and when traces of salts are present either under the paint coating or at breaks in the coating. A certain amount of under-rusting of the substrate, starting from the scribed mark, will al- ways occur. Filiform corr
26、osion, however, is considered to be present only if the typical pattern in the form of threads is obvious. V EN IS0 4623-12002 Paints and varnishes - Determination of resistance to filiform corrosion - Part 1: Steel substrates 1 Scope This part of IS0 4623 is one of a series of standards dealing wit
27、h the sampling and testing of paints, varnishes and related products. It describes a test procedure for assessing the protective action of coatings of paints or varnishes on steel against filiform corrosion arising from a scribed mark cut through the coating. 2 Normative references The following nor
28、mative documents contain provisions which, through reference in this text, constitute provisions of this part of IS0 4623. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IS0 4623 are encour
29、aged to investigate the possi- bility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 4
30、83, Plastics - Small enclosures for conditioning and testing using aqueous solutions to maintain relative hu- midity at constant value. IS0 151 3, Paints and varnishes - Examination and preparation of samples for testing. IS0 1514, Paints and varnishes - Standard panels for testing. IS0 2409. Paints
31、 and varnishes - Cross-cut test. IS0 2808, Paints and varnishes - Determination of film thickness. IS0 3270, Paints and varnishes and their raw materials - Temperatures and humidities for conditioning and testing. IS0 3696, Water for analytical laboratory use - Specification and test methods. IS0 46
32、28-10, Paints and varnishes - Evaluation of degradation of coatings - Part IO: Designation of intensity, quantity and size of common types of defect. IS0 7253, Paints and varnishes - Determination of resistance to neutral salt spray (fog). IS0 15528, Paints, varnishes and raw materials for paints an
33、d varnishes - Sampling. 1 EN IS0 4623-12002 3 Term and definition For the purposes of this part of IS0 4623, the following term and definition apply. 3.1 filiform corrosion a type of corrosion proceeding under a coat of paint, varnish or related product, in the form of threads, generally starting fr
34、om bare edges or from local damage to the coating NOTE 1 Usually the threads are irregular in length and direction of growth, but they may also be nearly parallel and of approxi- mately equal length. NOTE 2 Filiform corrosion can also occur under other protective coatings. 4 Principle A coated test
35、panel is scribed in a defined way. A small amount of sodium chloride is introduced into the scribed mark, either by dipping the panel in a solution of the salt or by exposure to salt-fog. The panel is then exposed in a test cabinet at 40 “C and a relative humidity of 80 %. The effects of exposure ar
36、e evaluated by criteria agreed in ad- vance between the interested parties, these criteria either being of a subjective nature or as given in IS0 4628-10. 5 Required supplementary information For any particular application, the test method specified in this part of IS0 4623 needs to be completed by
37、supplementary information. The items of supplementary information are given in annex A. 6 Sampling Take a representative sample of the product to be tested (or of each product in the case of a multi-coat system), as specified in IS0 15528. Examine and prepare each sample for testing, as specified in
38、 IS0 1513. 7 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 7.1 Test cabinet, capable of being maintained at (40 f 2) “C and a relative humidity of (80 f 5) %, and having provision for placing or hanging the test panels in an approximately vertical position so th
39、at the distance between the faces of adjacent panels is at least 20 mm. NOTE If a cabinet with automatic humidity control is not available, the specified humidity may be obtained by means of a satu- rated aqueous solution of ammonium sulfate. This gives a constant relative humidity of 79 % at 40 OC
40、(see IS0 483). Further de- tails and guidance are given in annex B. 8 Reagents 8.1 Sodium chloride solution (for the dipping technique). Unless otherwise specified, prepare the solution by dissolving 1 g of analytical grade sodium chloride in 1 litre of dis- tilled or demineralized water of at least
41、 grade 3 as defined in IS0 3696. Place the solution in a vessel suitable for complete immersion of the test panel (see 9.1 and 10.3.2). 2 EN IS0 4623-12002 9 Test panels 9.1 Material and dimensions The test panels shall be of burnished steel complying with the requirements of IS0 1514 and of minimum
42、 dimensions 150 mm x 75 mm x 0,3 mm, unless otherwise specified. 9.2 Preparation and coating Prepare the test panels by burnishing as described in IS0 1514, unless otherwise specified, and then coat them by the specified method with the product or system under test. Unless otherwise specified, the b
43、ack and edges of the panel shall be coated with the product or system under test. If the coating on the back and edges of the panel differs from that of the product under test, it shall have a corrosion resistance greater than that of the product under test. 9.3 Drying and conditioning Dry (or stove
44、) and age (if applicable) each coated test panel for the specified time under the specified conditions, and, unless otherwise specified, condition them at the standard conditions defined in IS0 3270 for at least 16 h, with free circulation of air and without exposing them to direct sunlight. The tes
45、t procedure shall then be carried out as soon as possible. 9.4 Thickness of coating Determine the thickness, in micrometres, of the dried coating by one of the non-destructive procedures described in IS0 2808. 10 Procedure 10.1 Number of determinations Carry out all tests in duplicate unless otherwi
46、se agreed. 10.2 Scribing the test panels Unless otherwise specified, make two scribed marks at least 30 mm long on each test panel using a suitable tool (see note). Make the scribed marks perpendicular to each other and arranged in such a way that their distance from each other or from the edge of t
47、he panel is not less than 20 mm (see Figure 1). Ensure that the cutting edge com- pletely penetrates the coating. Remove the debris from the scribed marks. Ensure that the metal is clearly visible over the entire length of the scribed marks by use of a magnifying glass of x10 magnification. NOTE It
48、has been found that the use of a mechanical scribing device gives a better scribe and has better repeatability than a hand-held scribing tool. The precise nature of the scribing tool is not critical provided that it produces a thin line with well-defined edges. A sharp blade such as the single-blade
49、 cutting tool defined in IS0 2409 has been found to be suitable. 3 EN IS0 4623-12002 Dimensions in millimetres 75 c Figure 1 -Arrangement of scribes on test panel 10.3 Testing 10.3.1 General Two alternative procedures are available, based on initiation by dipping in sodium chloride solution or by exposure to salt-fog respectively. The dipping technique is generally preferable for air-drying and low-durability materials. For high-durability systems such as automobile finishes applied to phosphated steel, the dipping technique may not pro- duce filiform corrosion and f
