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1、BRITISH STANDARD BS 7079-D2: 1993 ISO 8504-2: 1992 Preparation of steel substrates before application of paints and related products Group D: Methods for surface preparation Part D2: Abrasive blast-cleaning UDC 667.648.1:669.14:621.7.023 Licensed Copy: London South Bank University, London South Bank
2、 University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7079-D2:1993 This British Standard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee, was published under the authority of the Standards Board and comes into effect
3、 on 15 April 1993 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference PVC/21 Draft for comment 85/54566 DC ISBN 0 580 21690 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paints
4、and Varnishes Standards Policy Committee (PVC/-) to Technical Committee PVC/21, upon which the following bodies were represented: Association of Consulting Engineers British Chemical Engineering Contractors Association British Constructional Steelwork Association Ltd. British Gas plc British Grit As
5、sociation British Railways Board British Steel Industry Department of Transport Electricity Association Institute of Corrosion National Federation of Painting and Decorating Contractors Oil and Colour Chemists Association Paint Research Association Paintmakers Association of Great Britain Ltd. Royal
6、 Society of Chemistry Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7079-D2:1993 BSI 02-1999i Contents Page Committees responsibleInside front cover
7、 National forewordii Introduction1 1Scope1 2Normative references2 3Definition2 4Abrasives2 5Abrasive blast-cleaning methods4 6Procedure7 Annex A (informative) International Standards for metallic and non-metallic blast-cleaning abrasives8 Table 1 Commonly used blast-cleaning abrasives for steel subs
8、trate preparation3 Table 2 initial particle shape3 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7079-D2:1993 ii BSI 02-1999 National foreword This Part of BS 7079 has b
9、een prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It is identical with ISO 8504-2:1992 Preparation of steel substrates before application of paints and related products Surface preparation methods Part 2: Abrasive blast-cleaning, published by the Inte
10、rnational Organization for Standardization (ISO). This standard makes an informative reference to ISO 8501-2 and ISO 8504-3 which are in preparation. It is evisaged that when ISO 8501-2 is published it will be implemented, dual-numbered, as BS 7079-A2 and when ISO 8504-3 is published it will be impl
11、emented, dual-numbered, as BS 7079-D3. The Technical Committee has reviewed the provisions of ISO 8502-3:1992, to which normative reference is made in the text and has decided that they are acceptable for use in conjunction with this standard. It is intended that ISO 8502-3 will be implemented, dual
12、-numbered, as BS 7079-B3 after the correction of a technical error. Further information on the ISO 8501, ISO 8502, ISO 8503 and ISO 8504 series of standards is given in BS 7079 Preparation of steel substrates before application of paints and related products Part 0: Introduction. NOTETextual error.
13、In 5.2.3 “effictiveness” should read “effectiveness”. Cross-references International standard Corresponding British Standard ISO 2591-1:1988BS 1796 Test sieving Part 1:1989 Methods using test sieves of woven wire cloth and perforated metal plate (Identical) ISO 4628-3:1982BS 3900 Methods of test for
14、 paints Part H3:1983 Designation of degree of rusting (Identical) BS 7079 Preparation of steel substrates before application of paints and related products ISO 8501-1:1988Part A1:1989 Specification for rust grades and preparation grades of uncoated steel substrates and of steel substrates after over
15、all removal of previous coatings (Identical) ISO 8502-2:1992Part B2:1992 Method for determination of chlorides on cleaned surfaces (Identical) ISO 8503-1:1988Part C1:1989 Specification for surface profile comparators for the assessment of abrasive blast-cleaned surfaces (Identical) ISO 8503-2:1988Pa
16、rt C2:1989 Method for the grading of surface profile of abrasively blast-cleaned steel using a comparator (Identical) ISO 8504-1:1992Group D Methods for surface preparation Part D1:1993 General principles (Identical) ISO/TR 8502-1:1991 DD 207:1992 Method of test for soluble iron corrosion products t
17、o assess surface cleanliness of steel substrates before application of paints and related products (Identical) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7079-D2:1993 BSI 02-1999iii A British Standard d
18、oes 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 not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an in
19、side front cover, pages i to iv, pages 1 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, Lo
20、ndon South Bank University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8504-2:1992(E) BSI 02-19991 0 Introduction The performance
21、 of protective coatings of paint and related products applied 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
22、contaminants, including salts, dust, oils and greases; c) the 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 s
23、ubstrates, indicating the capabilities of each in attaining specified levels of cleanliness. 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 requirement
24、s for specific situations even though surface quality can have a 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
25、International Standards to ensure that the qualities specified are 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 S
26、tandards referred to above deal with the following aspects of preparation 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 p
27、reparation methods. Each of these International Standards is in turn divided into separate parts. The primary objective of surface preparation is to ensure the removal of deleterious matter and to obtain a surface that permits satisfactory adhesion of the priming paint to the steel. It should also a
28、ssist in reducing the amounts of contaminants that initiate corrosion. This part of ISO 8504 describes abrasive blast-cleaning methods. It should be read in conjunction with ISO 8504-1. Abrasive blast-cleaning is a most effective method for mechanical surface preparation. It is widely applicable bec
29、ause this method of surface preparation has a number of versatile features listed below. a) The method allows a high production rate. b) The equipment can be stationary or mobile and is adaptable to the objects to be cleaned. c) The method is applicable for most types and forms of steel surfaces. d)
30、 Many different surface states can be produced, for example different preparation grades and surface profiles. e) Effects such as cleaning, peening, roughening, levelling and lapping can be produced. f) It is possible to remove selectively partly failed coatings leaving sound coatings intact. WARNIN
31、G The procedure described in this part of ISO 8504 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 adequate precautions are not taken. Attention is drawn in t
32、he text to certain specific hazards. This part of ISO 8504 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 8504 describes abrasive blast-cleaning methods for the preparation of steel surfaces be
33、fore coating with paints and related products. It also contains information on the effectiveness of the individual methods and their fields of application. ISO 8504 is applicable to new and corroded steel surfaces and to steel surfaces that are uncoated or have been previously coated with paints and
34、 related products. For limitations see also note 2. NOTE 1These methods are essentially intended for hot-rolled steel to remove mill scale, rust, etc., but could also be used for cold-rolled steel of sufficient thickness to withstand the deformation caused by the impact of abrasive. NOTE 2There are
35、several items that should be included in the purchasers procurement documents to supplement this part of ISO 8504. Items that should be considered as a part of surface preparation before coating are edge grinding, removal of grease and oil, porosity of welds, removal of weld spatter, grinding of wel
36、ds, filling of pits and other surface imperfections that may cause premature failure of the coating system. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:42:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8504-2:1992(E) 2 BSI 02-1999 2 Normative reference
37、s The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 8504. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 8504 are encou
38、raged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2591-1:1988, Test sieving Part 1: Methods using test sieves of woven wire cloth and perforated metal p
39、late. ISO 4628-3:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity, quantity and size of common types of defect Part 3: Designation of degree of rusting. ISO 8501-1:1988, Preparation of steel substrates before application of paints and related products V
40、isual assessment of surface cleanliness Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings. ISO 8501-2:1), Preparation of steel substrates before application of paints and related products Visual assessment of su
41、rface cleanliness Part 2: Preparation grades of previously coated steel substrates after localized removal of previous coatings. ISO/TR 8502-1:1991, Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 1: Field test fo
42、r soluble iron corrosion products. ISO 8502-2:1992, 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. ISO 8502-3:1992, Preparation of steel substrates bef
43、ore application of paints and related products Tests for the assessment of surface cleanliness Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method). ISO 8503-1:1988, Preparation of steel substrates before application of paints and related products Surfa
44、ce roughness characteristics of blast-cleaned steel substrates Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces. ISO 8503-2:1988, Preparation of steel substrates before application of paints and related products Surface
45、roughness characteristics of blast-cleaned steel substrates Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel Comparator procedure. ISO 8504-1:1992, Preparation of steel substrates before application of paints and related products Surface preparation methods Part 1: G
46、eneral principles. ISO 8504-3:1), Preparation of steel substrates before application of paints and related products Surface preparation methods Part 3: Hand- and power-tool cleaning. 3 Definition For the purposes of this part of ISO 8504, the following definition applies. 3.1 abrasive blast-cleaning
47、 the impingement of a high-kinetic-energy stream of abrasive on to the surface to be prepared NOTE 3The abrasive is typically propelled either by centrifugal force or by a high-velocity stream of fluid such as air or water to remove rust, mill scale, existing coatings and other contaminants and expo
48、se the substrate. The cleaned surface has a characteristic secondary profile dependent on the blast-cleaning conditions, the properties of the abrasive, the initial condition of the surface and the properties of the steel being blast-cleaned. The initial surface roughness or primary profile may be a
49、ltered by the abrasive blast-cleaning procedure. Surface profiles are assessed using the method described in ISO 8503-2. When selecting a surface preparation method, it is necessary to consider the preparation grade required to give a level of surface cleanliness and, if required, a surface profile (roughness), such as coarse, medium or fine (see ISO 8503-1 and ISO 8503-2), appropriate to the coating system to be applied to the steel surface. Since the cost of surface preparation is usually in proportion