1、BRITISH STANDARDBS EN ISO 8502-11:2006 BS 7079-B11: 2006Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 11: Field method for the turbidimetric determination of water-soluble sulfateThe European Standard EN ISO 850
2、2-11:2006 has the status of a British StandardICS 25.220.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 8502-11:2006This British Standa
3、rd was published under the authority of the Standards Policy and Strategy Committee on 30 November 2006 BSI 2006ISBN 0 580 49637 6National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 8502-11:2006.The UK participation in its preparation was entrusted to T
4、echnical Committee STI/21, Surface preparation of steel. A list of organizations represented on STI/21 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance wit
5、h a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 8502-11April 2006ICS 25.220.10English VersionPreparation of steel substrates before application of paints andrelated produ
6、cts - Tests for the assessment of surfacecleanliness - Part 11: Field method for the turbidimetricdetermination of water-soluble sulfate (ISO 8502-11:2006)Prparation des subjectiles dacier avant application depeintures et de produits assimils - Essais pour apprcierla propret dune surface - Partie 11
7、: Mthode in situ pourla dtermination turbidimtrique des sulfates hydrosolubles(ISO 8502-11:2006)Vorbereitung von Stahloberflchen vor dem Auftragen vonBeschichtungsstoffen - Prfungen zur Bewertung derOberflchenreinheit - Teil 11: Feldverfahren fr dieBestimmung von wasserlslichem Sulfat durchTrbungsme
8、ssung (ISO 8502-11:2006)This European Standard was approved by CEN on 16 March 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and
9、 bibliographical references concerning such nationalstandards 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 in any other language made by translationunder the responsibility
10、 of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, L
11、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brusse
12、ls 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 8502-11:2006: EForeword This document (EN ISO 8502-11:2006) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committ
13、ee CEN/TC 139 “Paints 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 October 2006, and conflicting national standards shall be withdrawn a
14、t the latest by October 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Icela
15、nd, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 8502-11:2006 has been approved by CEN as EN ISO 8502-11:2006 without any modifications. EN I
16、SO 8502-11:2006Reference numberISO 8502-11:2006(E)INTERNATIONAL STANDARD ISO8502-11First edition2006-04-01Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 11: Field method for the turbidimetric determination of wat
17、er-soluble sulfate Prparation des subjectiles dacier avant application de peintures et de produits assimils Essais pour apprcier la propret dune surface Partie 11: Mthode in situ pour la dtermination turbidimtrique des sulfates hydrosolubles EN ISO 8502-11:2006ii iiiContents Page Foreword iv Introdu
18、ction v 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents 1 5 Apparatus 2 6 Procedure 2 6.1 Preparation of solvent 2 6.2 Removal of water-soluble contaminants from the surface 2 6.3 Blank test and preparation of the colloidal solution. 2 6.4 Turbidimetric measurement 3 7 Calculation a
19、nd expression of results 3 8 Precision 4 9 Test report . 5 EN ISO 8502-11:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
20、 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborate
21、s 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 ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards
22、. 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 the possibility that some of the elements of this
23、 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8502-11 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and relate
24、d products. ISO 8502 consists of the following parts, 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
25、 on steel surfaces prepared for painting (pressure-sensitive 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
26、 contaminants for analysis The Bresle method Part 8: 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
27、 for the titrimetric determination of water-soluble ferrous ions Parts 1 and 10 have been withdrawn. A field method for the determination of oil and grease is under consideration as Part 7. EN ISO 8502-11:2006vIntroduction The performance of protective coatings of paint and related products applied
28、to steel is significantly affected 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
29、 surface profile. International 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 s
30、pecified levels of cleanliness. These International Standards do not contain recommendations for the protective coating system 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
31、 direct influence on the choice 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 qualities specified are:
32、compatible and appropriate 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 prepa
33、ration of steel substrates: 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 tur
34、n divided into separate parts. There are a number of methods for the analysis of sulfates in solution. However, most of these are for laboratory use and very few are suitable for field use, i.e. in conjunction with sampling in workshops, at building sites, on board ships, etc., often under severe en
35、vironmental conditions. This field method for sulfates, and the corresponding methods of analysis that have been developed for other contaminants (such as ferrous ions, chlorides, and oil and grease) are intended to be used in conjunction with the Bresle method for the removal of contaminants from a
36、 surface, ISO 8502-6. These methods of analysis provide results which, after application of a simple conversion factor, indicate directly the amount of contaminants per unit surface area, usually expressed in mg/m2. The same method of analysis can also be used in conjunction with other contaminant e
37、xtraction methods. EN ISO 8502-11:2006blank1Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 11: Field method for the turbidimetric determination of water-soluble sulfate 1 Scope This part of ISO 8502 describes a f
38、ield method for the assessment of the surface density of water-soluble sulfate on steel surfaces before and/or after surface preparation. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited app
39、lies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696:1987, Water for analytical laboratory use Specification and test methods ISO 8502-6:2006, Preparation of steel substrates before application of paints and related products Tests f
40、or the assessment of surface cleanliness Part 6: Extraction of soluble contaminants for analysis The Bresle method 3 Principle Water-soluble sulfate and other salts are removed from a specific part of a steel surface, using the Bresle method, using water conforming to the requirements of grade 3 of
41、ISO 3696:1987 as solvent (see ISO 8502-6). A precipitation reagent, Ba(NO3)2or BaCI2, and a flocculant are added to the solution of removed sulfate, to produce a colloidal solution of BaSO4. The spectral absorbance of the dispersion depends on the sulfate content and can be used to determine the mas
42、s concentration of the removed sulfate in the solution. The corresponding surface density of the sulfate is then calculated by a simple formula. 4 Reagents 4.1 Water, conforming to the requirements of grade 3 of ISO 3696:1987. 4.2 Precipitation reagent, Ba(NO3)2or BaCI2, as specified by the manufact
43、urer of the turbidimeter (5.1). 4.3 Flocculant, as specified by the manufacturer of the turbidimeter (5.1). EN ISO 8502-11:20062 5 Apparatus 5.1 Turbidimeter, for measurement of the spectral absorbance of a colloidal solution. It shall be calibrated to indicate on a scale or a digital display the ma
44、ss concentration of 24SOin that solution within a range from 0 mg/l to at least 80 mg/l. NOTE Turbidimeters are commercially available and usually delivered in kits also containing the required reagents (4.2 and 4.3), the latter sometimes already mixed together in convenient amounts for instant use.
45、 5.2 Two measurement cells, designed for and belonging to the turbidimeter (5.1), designated the first cell and the second cell. 5.3 Plastics beaker. 5.4 Standard adhesive patch, conforming to the requirements of 4.1 in ISO 8502-6:2006, e.g. of size A-1250. 5.5 Syringe, conforming to the requirement
46、s of 4.2 in ISO 8502-6:2006. 5.6 Thermometer for measuring ambient air temperature, capable of being read to the nearest 0,5 C and graduated at 0,5 C intervals. 6 Procedure 6.1 Preparation of solvent Pour as much solvent (water) (4.1) into the plastics beaker (5.3) as required for two measurements w
47、ith the turbidimeter (5.1). Record the volume, e.g. 20 ml, to the nearest 0,5 ml. 6.2 Removal of water-soluble contaminants from the surface Use the procedure given in Clause 5 of ISO 8502-6:2006 with the following specific additional requirements: a) Fill the syringe (5.5) with as much as required
48、of the solvent prepared in 6.1 (see 5.3 of ISO 8502-6:2006). b) The total extraction time shall be 10 min 1 min. During that time, repeat the following 10 times: Without removing the syringe needle from the adhesive patch, inject the solvent into the patch compartment and then suck it back into the
49、syringe cylinder (see 5.6 of ISO 8502-6:2006). At the end of the 10th cycle, retrieve and transfer as much as possible of the solution containing the contaminants removed from the surface covered by the patch compartment to the beaker (5.3), thus restoring its content to the original volume (see 6.1) (e.g. 20 ml) as described in 5.7 of ISO 8502-6:2006. See also 6.4, second paragraph. 6.3 Blank test and preparation of the colloidal solution 6.3.1 Pour half of the solution prepared in 6.2, e.g. 10 ml,
