EN ISO 8502-2-2017 en Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 2 Laboratory determ.pdf

1、BS EN ISO 8502-2:2017Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanlinessPart 2: Laboratory determination of chloride on cleaned surfaces (ISO 8502-2:2017)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/

2、05/2013 15:06BS EN ISO 8502-2:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 8502-2:2017. It supersedes BS EN ISO 8502-2:2005 which iswithdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/21, Paint systems and surfa

3、ce preparation for metallic substrates.A list of organizations represented on this committee 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. The British Standards I

4、nstitution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 76073 0 ICS 25.220.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2017.Amen

5、dments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8502-2 February 2017 ICS 25.220.10 Supersedes EN ISO 8502-2:2005English Version Preparation of steel substrates before application of paints and related products - Tests for

6、 the assessment of surface cleanliness - Part 2: Laboratory determination of chloride on cleaned surfaces (ISO 8502-2:2017) Prparation des subjectiles dacier avant application de peintures et de produits assimils - Essais pour apprcier la propret dune surface - Partie 2: Recherche en laboratoire des

7、 chlorures sur les surfaces nettoyes (ISO 8502-2:2017) Vorbereitung von Stahloberflchen vor dem Auftragen von Beschichtungsstoffen - Prfungen zum Beurteilen der Oberflchenreinheit - Teil 2: Laborbestimmung von Chlorid auf gereinigten Oberflchen (ISO 8502-2:2017)This European Standard was approved by

8、 CEN on 19 September 2016. 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such national sta

9、ndards may be obtained on application to the CEN-CENELEC 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

10、notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary

11、, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN

12、-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8502-2:2017 EBS EN ISO 8502-2:2017EN ISO 8502-2:2017 (E) 3 European foreword This document (EN ISO 8502-2:2017)

13、has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee 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 identica

14、l text or by endorsement, at the latest by August 2017, and conflicting national standards shall be withdrawn at the latest by August 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held respo

15、nsible for identifying any or all such patent rights. This document supersedes EN ISO 8502-2:2005. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cy

16、prus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

17、the United Kingdom. Endorsement notice The text of ISO 8502-2:2017 has been approved by CEN as EN ISO 8502-2:2017 without any modification. BS EN ISO 8502-2:2017ISO 8502-2:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Principle 14 Reagents and materials . 15 Apparatus . 26 Pro

18、cedure. 27 Expression of results 38 Test report . 3Annex A (informative) Determination of chloride by coulometric titration 5Bibliography 6 ISO 2017 All rights reserved iiiContents PageBS EN ISO 8502-2:2017ISO 8502-2:2017(E)ForewordISO (the International Organization for Standardization) is a worldw

19、ide federation of national standards bodies (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 th

20、at committee. International organizations, 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.The procedures used to develop this docu

21、ment and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directiv

22、es, Part 2 (see www .iso .org/ directives).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. Details of any patent rights identified during the develop

23、ment of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO

24、specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Com

25、mittee ISO/TC 35, Paints and varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and related products.This third edition cancels and replaces the second edition (ISO 8502-2:2005), which has been technically revised with the following changes:a) the analysis me

26、thod has been deleted;b) a selection of analysis methods from other standards have been added;c) the coulometric method has been added and briefly described in an informative annex;d) the formula in Clause 7 has been replaced by Formula (1) transforming chloride concentration in asolution to amount

27、of chloride on the surface;e) the document has been editorially revised.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 determinatio

28、n of chloride on cleaned surfaces Part 3: Assessment of dust 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 painti

29、ng (ion detection tube method) Part 6: Extraction of soluble contaminants for analysis The Bresle method 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 t

30、itrimetric determination of water-soluble ferrous ionsiv ISO 2017 All rights reservedBS EN ISO 8502-2:2017ISO 8502-2:2017(E)IntroductionThe performance of protective coatings of paint and related products applied to steel is significantly affected by the state of the steel surface immediately prior

31、to painting. The principal factors that are known to influence this performance are as follows:a) presence of rust and mill scale;b) presence of surface contaminants, including salts, dust, oils and greases;c) surface profile.The ISO 8501, ISO 8502 and ISO 8503 series of International Standards have

32、 been prepared to provide methods of assessing these factors, while the ISO 8504 series provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness.These series of International Standa

33、rds 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 choice of protective coating t

34、o 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 appropriate both for the environmenta

35、l conditions to which the steel will be exposed and for the protective coating system to be used, and within the capability of the cleaning procedure specified.The four series of International Standards referred to above deal with the following aspects of preparation of steel substrates before appli

36、cation of paints and related products: ISO 8501 on visual assessment of surface cleanliness; ISO 8502 on tests for the assessment of surface cleanliness; ISO 8503 on surface roughness characteristics of blast-cleaned steel substrates; ISO 8504 on surface preparation methods.Each of these Internation

37、al Standards is in turn divided into separate parts. This part of ISO 8502 describes a method for the assessment of chloride-containing salts that are readily soluble in water and are present on a steel surface. Rusted steel substrates, particularly of rust grades C or D (see ISO 8501-1), even when

38、blast cleaned to preparation grade Sa 3 (see ISO 8501-1) can still be contaminated by soluble salts and corrosion products. These compounds are almost colourless and are localized at the lowest point of the rust pits. If they are not removed prior to painting, chemical reactions can result in large

39、accumulations of rust that destroy the adhesion between the substrate and the applied protective coating. Even if the salt is readily soluble in water, it is often impossible to remove it completely from the surface by a simple washing such as that described in this procedure. The method does not th

40、erefore determine the total amount of chloride on the surface but gives an indication of the cleanliness level of the surface. Prolonging the washing time should remove a larger proportion of the salt. ISO 2017 All rights reserved vBS EN ISO 8502-2:2017BS EN ISO 8502-2:2017Preparation of steel subst

41、rates before application of paints and related products Tests for the assessment of surface cleanliness Part 2: Laboratory determination of chloride on cleaned surfaces1 ScopeThis part of ISO 8502 describes a method for the determination of chloride-containing salts that are readily soluble in water

42、 and are present on a steel surface. The method is also applicable to previously coated surfaces. This part of ISO 8502 includes a method, applicable in the field or in the laboratory, for washing off the surface while several methods are referred to for chloride analyses.NOTE 1 ISO 8502-5 describes

43、 a field test for the determination of chloride on a surface.NOTE 2 The precision of the method is limited by both the accuracy of the selected method of analyses and by uncertainties in the sampling procedure. The extraction method might not take all the water soluble material off the surface due t

44、o soluble material hiding in crevices, under folds of metal or at the bottom of pits, and soluble material hiding under corrosion layers, passivation layers, inhibitors, oil, grease, or other non-visible thin films as these boundary layers can prevent contact with the underlying salt for its removal

45、.NOTE 3 The performance of a paint system is affected by the amount of soluble chloride remaining on the surface. The acceptable level of this contamination is related to the service conditions. For further information regarding levels of water-soluble salt contamination, see ISO/TR 15235.2 Normativ

46、e referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) appl

47、ies.ISO 3696, Water for analytical laboratory use Specification and test methods3 PrincipleA defined area of the steel surface is washed with a known volume of water and assessment of chloride concentration in the wash water is then carried out using instrumental methods.4 Reagents and materialsDuri

48、ng the analysis, use only reagents of recognized analytical grade.4.1 Water, conforming to the requirements of grade 3 of ISO 3696.4.2 Chalk, essentially chloride-free, or other suitable means for marking the test area.4.3 Absorbent cotton pads (cotton wool), of mass 1 g to 1,5 g.INTERNATIONAL STAND

49、ARD ISO 8502-2:2017(E) ISO 2017 All rights reserved 1BS EN ISO 8502-2:2017ISO 8502-2:2017(E)5 Apparatus5.1 Ruler.5.2 Metal spatula or knife.5.3 Gloves, of plastics material.5.4 Beakers, of capacity 250 ml.5.5 Small glass rod.5.6 Filter funnel.5.7 Filter paper, approximately 120 mm diameter.5.8 Measuring cylinder, of capacity 50 ml.5.9 Volumetric flasks, of capacities 50 ml, 100 ml and 1 000 ml.5.10 Volumetric pipettes, of capacities 1 ml and 20 ml.6 Procedure6.1 Washing of the surfaceCarry out the test at least in duplicate. Duri