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1、 Reference number ISO 8502-6:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 8502-6 Second edition 2006-07-01 Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 6: Extraction of soluble contaminants for analysis The Bres
2、le method Prparation des subjectiles dacier avant application de peintures et de produits assimils Essais pour apprcier la propret dune surface Partie 6: Extraction des contaminants solubles en vue de lanalyse Mthode de Bresle ISO 8502-6:2006(E) PDF disclaimer This PDF file may contain embedded type
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5、mized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no
6、 part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case posta
7、le 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved ISO 8502-6:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 P
8、rinciple. 1 4 Apparatus and materials 2 5 Procedure 2 6 Test report . 3 Annex A (normative) Leak test for type testing of patches. 6 ISO 8502-6:2006(E) iv ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
9、dies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizatio
10、ns, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the
11、ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. 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 th
12、e member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8502-6 was prepared by Technical Committee ISO/TC 35, Paints and
13、varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and related products. This second edition cancels and replaces the first edition (ISO 8502-6:1995), which has been revised to clarify the procedure (see 5.6 and 5.7). ISO 8502 consists of the following parts,
14、 under the general title Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness: Part 2: Laboratory determination of chloride on cleaned surfaces Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-se
15、nsitive tape method) Part 4: Guidance on the estimation of the probability of condensation prior to paint application Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method) Part 6: Extraction of soluble contaminants for analysis The Bresle method Part 8:
16、Field method for the refractometric determination of moisture Part 9: Field method for the conductometric determination of water-soluble salts Part 11: Field method for the turbidimetric determination of water-soluble sulfate Part 12: Field method for the titrimetric determination of water-soluble f
17、errous ions Parts 1 and 10 have been withdrawn. Part 7 (Field method for the determination of oil and grease) is in preparation. ISO 8502-6:2006(E) ISO 2006 All rights reserved v Introduction The performance of protective coatings of paint and related products applied to steel is significantly affec
18、ted by the state of the steel surface immediately prior to painting. The principal factors that are known to influence this performance are: a) the presence of rust and mill scale; b) the presence of surface contaminants, including salts, dust, oils and greases; c) the surface profile. International
19、 Standards ISO 8501, ISO 8502 and ISO 8503 have been prepared to provide methods of assessing these factors, while ISO 8504 provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness.
20、 These International Standards do not contain recommendations for the protective coating systems to be applied to the steel surface. Neither do they contain recommendations for the surface quality requirements for specific situations, even though surface quality can have a direct influence on the ch
21、oice of protective coating to be applied and on its performance. Such recommendations are found in other documents such as national standards and codes of practice. It will be necessary for the users of these International Standards to ensure that the qualities specified are: compatible and appropri
22、ate both for the environmental conditions to which the steel will be exposed and for the protective coating system to be used; within the capability of the cleaning procedure specified. The four International Standards referred to above deal with the following aspects of preparation of steel substra
23、tes: ISO 8501 Visual assessment of surface cleanliness; ISO 8502 Tests for the assessment of surface cleanliness; ISO 8503 Surface roughness characteristics of blast-cleaned steel substrates; ISO 8504 Surface preparation methods. Each of these International Standards is in turn divided into separate
24、 parts. This is one of a number of parts of ISO 8502 that specify tests for the assessment of surface cleanliness. In connection with such tests, there are several methods for the extraction, for analysis, of soluble contaminants on surfaces to be painted. Some of these methods are based on the swab
25、bing of comparatively large test surfaces. This technique provides average values of the contamination present, but it might conceal localized concentrations of contaminants. Also, swabbing might not ensure sufficient penetration to dissolve all of the deep-seated contamination such as ferrous salts
26、. There are other methods, however, which use small cells for the liquid used to remove and collect the surface contaminants. The cells (rigid or flexible) are attached to test surfaces where soluble contaminants could be expected, e.g. where pitting has occurred. This technique usually provides mor
27、e accurate, point values of the contamination present. This part of ISO 8502 describes a simple, inexpensive field test using flexible cells in the form of adhesive patches designed to be filled with solvent. The method was originally developed by a Swedish scientist, Dr. A. Bresle. INTERNATIONAL ST
28、ANDARD ISO 8502-6:2006(E) ISO 2006 All rights reserved 1 Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 6: Extraction of soluble contaminants for analysis The Bresle method 1 Scope This part of ISO 8502 describes
29、 a method of extracting, for analysis, soluble contaminants from a surface by use of flexible cells in the form of adhesive patches which can be attached to any surface, regardless of its shape (flat or curved) and its orientation (facing in any direction, including downwards). The method described
30、is suitable for use in the field to determine the presence of soluble contaminants before painting or a similar treatment. This part of ISO 8502 does not cover the subsequent analysis of the contaminants that have been dissolved off. Methods of analysis suitable for field use are described in other
31、parts of ISO 8502. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 554
32、, Standard atmospheres for conditioning and/or testing Specifications ISO 8501-1, Preparation of steel substrates before application of paints and related products Visual assessment of surface cleanliness Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates
33、 after removal of previous coatings ISO 8503-2, Preparation of steel substrates before application of paints and related products Surface roughness characteristics of blast-cleaned steel substrates Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel Comparator procedure
34、 ISO/IEC Guide 2, Standardization and related activities General vocabulary 3 Principle An adhesive patch with a central compartment designed to hold a solvent is attached to the surface from which soluble contaminants are to be removed. The solvent is injected into the compartment by means of a syr
35、inge, and then sucked back into the syringe. This operation is repeated a number of times. The solvent (now containing contaminants dissolved off the test surface) is then transferred to a suitable vessel for analysis. ISO 8502-6:2006(E) 2 ISO 2006 All rights reserved 4 Apparatus and materials 4.1 A
36、dhesive patch, the body of which is made of ageing-resistant, flexible material with closed pores, e.g. polyethylene foam, and with a hole punched in the centre. The punched-out material is kept in the hole as a reinforcement until the patch is used. One side of the patch is coated with a thin elast
37、omer film. The other side is coated with adhesive and covered by a removable protective sheet made of paper. NOTE The hole and the outer edge of the patch may be any shape, e.g. circular, rectangular, elliptical, etc. The thickness of the patch shall be 1,5 mm 0,3 mm. The width of the adhesive rim b
38、etween the hole and the outer edge of the patch shall be at least 5 mm. Patches with one of the standard compartment sizes specified in Table 1 are called standard patches. It is essential that the adhesive patch is leaktight. An easily performed leak test has therefore been developed for type testi
39、ng (see Annex A). Twelve patches of the same size shall be tested, and at least eight of them shall pass the test. The leak test shall be carried out by an accredited laboratory and the result stated in a test report. For terms and definitions in this context, see ISO/IEC Guide 2. Table 1 Standard p
40、atches Patch size Compartment area (mm2) A-0155 A-0310 A-0625 A-1250 A-2500 1155 2 1310 3 1625 6 1 250 13 2 500 25 4.2 Reusable syringe: max. cylinder volume: 8 ml max. needle diameter: 1 mm max. needle length: 50 mm 4.3 Solvent, chosen as a function of the surface contaminants to be determined. For
41、 the determination of water-soluble salts or other water-soluble contaminants, use distilled or deionized water. 4.4 Contact thermometer, accurate to 0,5 C and graduated at 0,5 C intervals. 5 Procedure 5.1 Take an adhesive patch (4.1) of a suitable size (see Table 1). Remove the protective paper and
42、 the punched-out material (see Figure 1). 5.2 Press the adhesive side of the patch against the test surface (see Figure 2) in such a way that the minimum amount of air is trapped in the compartment in the patch. 5.3 Fill the syringe (4.2) with solvent (4.3) (see Figure 3). NOTE The volume of solvent
43、 needed to fill the patch compartment is proportional to the compartment area, and normally amounts to 2,6 103 ml/mm2 0,6 103 ml/mm2. ISO 8502-6:2006(E) ISO 2006 All rights reserved 3 5.4 Insert the syringe needle at an angle of about 30 to the test surface near the outer edge of the patch, so that
44、it passes through the adhesive foam body of the patch into the compartment formed between the elastomer film and the test surface (see Figure 4). If the patch is in a position which makes access to the patch compartment difficult, bend the syringe needle as required. 5.5 Inject the solvent, ensuring
45、 that it wets the whole of the test surface (see Figure 4). If necessary to avoid air remaining trapped in the patch compartment, carry out the injection in two steps as follows: Inject half of the solvent. Evacuate the air through the needle by reverse operation of the syringe. Remove the needle fr
46、om the patch. Holding the syringe with the needle pointing upwards, expel the air. Re-insert the needle into the compartment and inject the remainder of the solvent. 5.6 After a suitable period of time, to be agreed between the interested parties, suck the solvent back into the syringe (see Figure 5
47、). During this period of time, without removing the syringe needle from the patch, re-inject the solvent into the compartment and then suck the solvent back into the syringe cylinder at least four times. NOTE On unpitted blast-cleaned areas, a period of 10 min has been found satisfactory, as by then
48、 more than 90 % of the soluble salts have usually been dissolved. 5.7 Transfer the solvent to a suitable vessel for analysis (see Figure 6). NOTE In most cases, approximately 95 % of the soluble surface contaminants can be dissolved off by carrying out steps 5.3 to 5.7 only once. By repeating these
49、steps with fresh solvent, almost all of the remaining 5 % can also be dissolved off. 5.8 During steps 5.3 to 5.7, it is essential that no solvent be lost from the patch or syringe, due for instance to inferior-quality materials or improper handling of the materials. If any solvent is lost, the solution obtained shall be rejected. 5.9 On completion of step 5.7, clean and rinse the syringe so that it can be re-used. A bent needle is best left as it is until it