1、BRITISH STANDARD O Preparation of steel substrates before application of paints and related products - Group B: Methods for the assessment of 0 surface cleanliness - Part B9: Field method for the conductometric determination of water-soluble salts ICs 17.040.20; 25.22.10; 87.020 1 BS EN IS0 BS 7079-
2、B9:1998 8502-9:2001 Incorporating Amendment No. 1 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 8502-9:2001 Board and comes into effect on 15 August 1998 Amd. N. National foreword Comments Date This British Standard is the official English language version of EN IS
3、0 8502-9:2000, Preparation of steel substrates before application ofpaints and related products - Tests for the assessment of surface of cleanliness - Part 9: Field method for the conductometric determination of water-soluble salts, including amendment A1:2000, and implements it as the UK national s
4、tandard. It reproduces verbatim IS0 8502-9: 1998. The original BS identifier BS 7079-B9:1998 has been retained for ease of cross-reference. The UK participation in its preparation was entrusted to Technical Committee STI/21, Surface preparation of steel, which has the responsibility to: - aid enquir
5、ers to understand the text; - present to the responsible internationallEuropean 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
6、 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 the BSI Standards Catalogue under the section entitled “International Standards Corre
7、spondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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 no
8、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, the EN foreword page, the IS0 title page, the IS0 foreword page, pages 1 to 4, an inside back cover and a back cover. The BSI copyrigh
9、t notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the Amendm
10、ents issued since publication I I O BSI 06-2001 12095 I June 2001 Indicated by a sideline I I I I l ISBN O 580 30219 9 BS EN IS0 8502-9:2001 I Contents National foreword Page Inside front cover Introduction 1 Scope 2 Normative references 3 Principle 4 Solvent 5 Apparatus and materials 6 Procedure 7
11、Expression of results 8 Accuracy 9 Textreport 1 1 1 2 2 2 2 3 5 51 Figure 1 - The total surface density PA of the salts as a function of the change in conductivity Ay 4 6 BSI 06-2001 1 EUROPEAN STANDARD EN IS0 8502-9 August 2000 NORME EUROPEENNE EUROPISCHE NORM + Al December 2000 Emglish version Pre
12、paration of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 9: Field method for the conductometric determination of water-soluble salts (IS0 8502-9:1998 + A1:2000) o Prparation des subjectiles dacier avant application de pei
13、ntures et de produits assimils - Essais pour apprcier la propret dune surface - Partie 9: Mthode in situ pour la dtermination des sels solubles dans leau par conductimtrie (IS0 8502-9:1998 + A1:2000) This European Standard was approved by CEN on 6 August 2000. CEN members are bound to comply with th
14、e 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 standards may be obtained on application to the Central Secretariat o
15、r 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 Central Secretariat has the same status as the official vers
16、ions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Euro
17、pen de Normalisation Europisches Komitee fir Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 0 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. o Ref. No. EN IS0 8502-9:2000 + AL2000 E w EN IS0 8502-9:2000 Foreword The tex
18、t of the International Standard from Technical Committee ISO/TC 35, Paints and varnishes, of the International Organization for Standardization (ISO), including amendment A1:2000; has been taken over as a European Standard by Technical Committee CEN/TC 139, Paints and varnishes, the Secretariat of w
19、hich 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 February 2001, and conflicting national standards shall be withdrawn at the latest by February 2001. According to the CENEENELE
20、C 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, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switz
21、erland and the United Kingdom. O BSI 06-2001 INTERNATIONAL STANDARD IS0 850219 First edition Amendment 1 1999-1 2-02 1998-05-01 Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 9: Field method for the conductom
22、etric determination of water-soh ble salts Prparation des subjectiles dacier avant application de peintures et de produits assimils - Essais pour apprcier la propret dune surface - Partie 9: Mthode in situ pour la dtermination des sels solubles dans leau par conductimtrie Reference number IS0 6502-9
23、11 998(E) EN IS0 8502-9:2000 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interest
24、ed 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. IS0 collaborates closely with the International Electrotechnical Co
25、mmission (IEC) on all matters of electrotechnical standardization. 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. Intern
26、ational Standard IS0 8502-9 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and related products. IS0 8502 consists of the following parts, under the general title Preparation of steel substrates be
27、fore application of paints and related products - Tests for the assessment of surface cleanliness: - Part 1: Field test for soluble iron corrosion products Technical Report; - Part 2: Laboratory determination of chloride on cleaned surfaces; - Part 3: Assessment of dust on steel surfaces prepared fo
28、r 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 contaminants for ana
29、lysis - The Bresle method; - Part 7: Field method for determination of oil and grease; - Part 8: Field method for refractometric determination of moisture; - Part 9: Field method for the conductometric determination of water-soluble salts; -Part 10: Field method for the titrimetric determination of
30、chloride. Descriptors: Paints, varnishes, substrates, steel products, tests, field tests, determination, surface condition, cleanliness checks, conductimetric methods. EN IS0 8502-9:2000 Introduction The performance of protective coatings of paint and related products applied to steel is significant
31、ly 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 surface profile. Inter
32、national Standards IS0 8501, IS0 8502 and IS0 8503 have been prepared to provide methods of assessing these factors, while IS0 8504 provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of clea
33、nliness. 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 a direct influence on
34、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 the qualities specified are: - compatible and
35、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. 0 The four International Standards referred to above deal with the following aspects of preparation of s
36、teel substrates: IS0 8501, Visual assessment of surface cleanliness. IS0 8502, Tests for the assessment of surface cleanliness. IS0 8503, Surface roughness characteristics of blast-cleaned steel substrates. IS0 8504, Surface preparation methods. Each of these International Standards is in turn divid
37、ed into separate parts. . .* This part of IS0 8502 describes a field method for the assessment of the total amount of water-soluble salts, I the salts being regarded as forming one single contaminant. The more aggressive contaminants causing corrosion and blistering (the ionic species) can easily be
38、 dissolved off and determined rapidly by this method. Consequently, the less aggressive and not so easily dissolved minor part of contaminant will remain un-assessed. For additional information on the test method, its potential and its limitations, see BRESLE, A., Conductometric determination of sal
39、ts on steel surfaces, MP (Materials Performance), June 1995, Vol. 34, No. 6, pp. 35-37, NACE International, Houston TX, USA. Rusty steel substrates, particularly those of rust grades C or D (see IS0 8501-l), even when blast-cleaned to preparation grade Sa 3 (see IS0 8501-1 and IS0 8501-2), may still
40、 be contaminated by water-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 blister formation and accumulations of rust that destroy the adhes
41、ion between the substrate and the applied protective coating. 1 Scope This part of IS0 8502 describes a field method for the assessment of the total surface density of various water-soluble salts (mostly chlorides and sulfates) on steel surfaces before andor after surface preparation. The individual
42、 surface densities of chlorides, sulfates, etc., cannot be determined by this method. This method assesses ionic contaminants only. These represent the greater part of the contamination. 2 Normative references The following standards contain provisions which, through reference in this text, constitu
43、te provisions of this part of IS0 8502. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreement based on this part of IS0 8502 are encouraged to investigate the possibility of applying the most recent editions of the standards in
44、dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. a 0 O BSI 06-2001 1 EN IS0 8502-9:2000 IS0 3696: 1987, Water for analytical laboratory use - Specification and test methods. IS0 8502-6:1995, Preparation of steel substrates before application of pai
45、nts and related products - Tests for the assessment of surface cleanliness -Part 6: Extraction of soluble contaminants for analysis - The Bresle method 3 Principle The salts on the given area of the steel surface are dissolved by the Bresle method (see IS0 8502-6), using water as solvent. The conduc
46、tivity of the solution thus obtained is measured. Finally, the total surface density of the salts in this area is calculated by a simple but sufficiently accurate equation. 4 Solvent Water of at least grade 3 purity in accordance with IS0 3696. NOTE Usually, distilled or de-ionized water of conducti
47、vity less than 0,5 mS/m (5 pS/cm) meets this requirement. 5 Apparatus and materials 5.1 Conductometer, with temperature compensation and sufficient range, e.g. from O mS/m (O pS/cm) to 200 mS/m (2 O00 pS/cm). 5.2 GZass beaker, of convenient size and shape for housing the electrode end of the conduct
48、ometer (5.1) during measurement. 5.3 Standard adhesive patch, as specified in 4.1 of IS0 8502-6:1995, e.g. of size A-1250. NOTE The patch should not cause any noticable contamination of the extraction liquid. Certain patches are available today which are guaranteed to cause an ionic contamination of
49、 less than 7 mg/m2, which is generally satisfactory. If there is no guarantee or if improved accuracy is required, then a blank test is recommended. 5.4 Syringe, as specified in 4.2 of IS0 8502-6:1995. 6 Procedure 6.1 Preparation of water and blank test 6.1.1 Pour into the beaker (5.2) an amount of water (clause 4) that is just large enough for the operation of the conductometer (5.1). Usually a volume between 10 ml and 20 ml is needed. To prevent foreign matter inside the beaker and syringe, and on the conductometer probe, from influencing the result, carry
