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1、BRITISH STANDARD BS EN ISO 8502-2:2005 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 The European Standard EN ISO 8502-2:2005 has the status of a Briti
2、sh Standard ICS 25.220.10 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8502-2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 January 2006 BSI 4 January 2006 ISB
3、N 0 580 47405 4 National foreword This British Standard is the official English language version of EN ISO 8502-2:2005. It is identical with ISO 8502-2:2005. It supersedes BS EN ISO 8502-2:2000 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/21, S
4、urface preparation of steel, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in
5、the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsibl
6、e for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK int
7、erests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 6, an in
8、side back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EURO
9、PEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8502-2 October 2005 ICS 25.220.10Supersedes EN ISO 8502-2:1999 English Version Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 2: Laboratory determination o
10、f chloride on cleaned surfaces (ISO 8502-2:2005) 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 chlorures sur les surfaces nettoyes (ISO 8502-2:2005) Vorbereitung von Sta
11、hloberflchen vor dem Auftragen von Beschichtungsstoffen - Prfungen zur Beurteilen der Oberflchenreinheit - Teil 2: Laborbestimmung von Chlorid auf gereinigten Oberflchen (ISO 8502-2:2005) This European Standard was approved by CEN on 8 August 2005. CEN members are bound to comply with the CEN/CENELE
12、C 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 may be obtained on application to the Central Secretariat or to any CEN
13、 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 Central Secretariat has the same status as the official versions. CEN me
14、mbers are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and U
15、nited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8502
16、-2:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword This document (EN ISO 8502-2:2005) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee CEN/TC 139 “Paints and
17、 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 April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006.
18、 This document supersedes EN ISO 8502-2:1999. 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
19、, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 8502-2:2005 has been approved by CEN as EN ISO 8502-2:2005 without any modifications.
20、 EN ISO 8502-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 8502-2:2005(E) INTERNATIONAL STANDARD ISO 8502-2 Second edition 2005-10-15 Preparation of steel substrates before application of paints and related prod
21、ucts Tests for the assessment of surface cleanliness Part 2: Laboratory determination of chloride on cleaned surfaces 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 chlorures
22、 sur les surfaces nettoyes EN ISO 8502-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Foreword iv Introdu
23、ction v 1 Scope . 1 2 Normative references. 1 3 Principle. 2 4 Reagents and materials . 2 5 Apparatus 3 6 Procedure 3 6.1 Blank titration 3 6.2 Washing of the surface 3 6.3 Wash-water titration . 4 7 Expression of results . 4 8 Test report . 5 Bibliography. 6 EN ISO 8502-2:2005 Licensed Copy: sheffi
24、eldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv 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
25、 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO col
26、laborates 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 S
27、tandards. 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
28、 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 8502-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and
29、 related products. This second edition cancels and replaces the first edition (ISO 8502-2:1992), which has been technically 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 asses
30、sment of surface cleanliness: Part 1: Field test for soluble iron corrosion products (withdrawn) Technical Report Part 2: Laboratory determination of chloride on cleaned surfaces Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method) Part 4: Guidance on t
31、he 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: Field method for the refractometric determ
32、ination of moisture Part 9: Field method for the conductometric determination of water-soluble salts Part 10: Field method for the titrimetric determination of water-soluble chloride (withdrawn) Part 11: Field method for the turbidimetric determination of water-soluble sulfate Part 12: Field method
33、for the titrimetric determination of water-soluble ferrous ions EN ISO 8502-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction The performance of protective coatings of paint and related products applied to steel is signif
34、icantly 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, and c) the surface profil
35、e. 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. These I
36、nternational 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 choice of p
37、rotective 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 appropriate both f
38、or the environmental 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 International Standards referred to above deal with the following aspects of preparation of steel substrates be
39、fore application 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
40、International 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),
41、 even when 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 resul
42、t in large 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
43、does not therefore 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. EN ISO 8502-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+
44、00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:39:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 2: Laborato
45、ry determination of chloride on cleaned surfaces WARNING The procedure described in this part of ISO 8502 is intended to be carried out by qualified chemists or by other suitably trained and/or supervised personnel. The substances and procedures used in this method may be injurious to health if adeq
46、uate precautions are not taken. Attention is drawn in the text (see 4.5) to certain specific hazards. This part of ISO 8502 refers only to its technical suitability and does not absolve the user from statutory obligations relating to health and safety. 1 Scope This part of ISO 8502 describes a metho
47、d for the determination of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. It will normally be used in a laboratory using washings sampled from surfaces on site. The method is applicable to t
48、he determination of salts that have been deposited on the steel surface before, during or after the cleaning operations. NOTE 1 Although the procedure for chloride determination is generally accurate, the overall precision of the method is limited by uncertainties in the sampling procedure. In addit
49、ion, traces of iron chloride at the bottom of pits are difficult to extract into the sample. The test method is not applicable to surfaces treated with chromate, nitrite or amine, which are commonly used as inhibitors in the water when wet blast-cleaning. This is because a chromate concentration of 10 mg/l or greater or a nitrite concentration of 20 mg/l or greater in the wash water interferes with the determination of the chlori