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1、BRITISH STANDARD AEROSPACE SERIES BS 2X 32:1998 Incorporating Amendment No. 1 Specification for pretreatment etch primer for aerospace purposes ICS 49.040 ? Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 This British Standard,
2、 having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1998 BSI 16 February 2006 First published 28 June 1991 Second edition April 1998 The following BSI references relate to the work on th
3、is standard: Committee reference ACE/44 Draft for comment 96/705058 DC ISBN 0 580 27977 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/44, Protective treatments and aircraft finishes, upon which the following bodie
4、s were represented: British Coatings Federation Ltd. Metal Finishing Association Ministry of Defence National Centre of Tribology Oil and Colour Chemists Association Society of British Aerospace Companies Amendments issued since publication Amd. No.DateComments 16019February 2006Amendments to Table
5、1 and Table 2 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 BSI 16 February 2006 i Contents Page Committees responsibleInside front cover Forewordii 1Scope 1 2References 1 3Definitions 1 4Materials 1 5Performance 2 6Batch ins
6、pection 2 7Marking 2 Annex A (normative) Type approval 5 Annex B (normative) Preparation of test panels 5 List of references 6 Table 1 Tests on liquid paint 3 Table 2 Tests on the dry run 4 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
7、2X 32:1998 ii BSI 16 February 2006 Foreword This British Standard has been prepared by Technical Committee ACE/44 and is one of a series for paints and varnishes suitable for aerospace purposes. It specifies requirements for a two pack pretreatment etch primer that may be used with British Standard
8、X series primer and/or finishing schemes. It supersedes BS X 32:1991 which has been withdrawn. During its preparation the layout has been aligned with other BS X series standards and all references have been revised. The start and finish of text introduced or altered by amendment is indicated in the
9、 text by tags !“. Tags indicating changes to text carry the number of the amendment. For example, text altered by amendment A1 is indicated by !“. It has been assumed in the drafting of this British Standard that execution of its provisions is entrusted to appropriately qualified and experienced peo
10、ple. The quality assurance authority and approving authority referred to in this British Standard are as stated in the contract or order, or the accredited representative of the authority stated, as instructed by the purchaser. WARNING. This British Standard calls for the use of substances and/or pr
11、ocedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. This publication does not purport to include all the necessary provisions of a cont
12、ract. Users are responsible for its 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 inside front cover, pages i and ii, pages 1 to 7 and a back cover. The BSI copyright notic
13、e displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 BSI 16 February 2006 1 1 Scope This British Standard specifies requirements for the materials and perform
14、ance of a water resistant, two pack pretreatment etch primer for aerospace applications. The pretreatment etch primer is for use on metallic substrates to provide adhesion for an anti-corrosive primer and finishing scheme. Information on application for type approval is provided in Annex A. 2 Refere
15、nces 2.1 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on page 6. For dated references, only the edition cited
16、 applies; any subsequent amendments to or revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative ref
17、erences This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of th
18、is British Standard the definitions given in BS 2015 apply. 4 Materials 4.1 Composition 4.1.1 The pretreatment etch primer shall consist of a pigmented phenolic/polyvinyl acetal resin base and an activator containing an appropriate quantity of orthophosphoric acid in a suitable solvent. The base and
19、 activator shall be mixed in simple proportions by volume and thinned as necessary with the appropriate thinners as recommended by the manufacturer. 4.1.2 The pigment of the pretreatment etch primer shall consist essentially of zinc tetroxychromate opacifying pigments and extenders. 4.1.3 The zinc t
20、etroxychromate (see 4.1.2) shall conform to zinc chrome type 3 of BS 282, 389:1963. 4.2 Scheme components 4.2.1 General Components used in tests on the primer as part of a paint scheme shall conform to 4.2.2, 4.2.3 and 4.2.4. 4.2.2 Pretreatment etch primer Pretreatment etch primer shall conform to t
21、his British Standard. 4.2.3 Primer Primer shall conform to type A of BS X 33 unless otherwise specified. 4.2.4 Finish Finish shall conform to type A of BS X 34 unless otherwise specified. NOTE The performance of a scheme including components otherwise specified may be suitable but should be separate
22、ly assessed. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 2 BSI 16 February 2006 5 Performance 5.1 General 5.1.1 Test panels shall be prepared and coated as specified in Annex B. 5.1.2 Unless otherwise specified, all tests s
23、hall be carried out in temperature and relative humidity conditions conforming to BS EN 23270. 5.2 Tests on liquid paint Pretreatment etch primer shall conform to Table 1. 5.3 Tests on the dry film The dry paint film, prepared in accordance with Annex B, shall conform to Table 2. 6 Batch inspection
24、Before despatch, a representative sample of each batch of material, taken in accordance with BS EN 21512, shall be tested to confirm conformity to tests 1, 4, 5 and 6 of Table 1, and, when prepared in accordance with Annex B, the scheme shall conform to tests 1 and 2 of Table 2. NOTE Samples of mate
25、rial and material ingredients may be inspected at any stage of manufacture, and from any portion of the batch. 7 Marking In addition to any statutory requirements each container shall be legibly and durably marked with at least the following: a) a description of the material; b) the number and date
26、of this British Standard, i.e. BS 2X 32:1998; c) the colour (with the colour standard if appropriate); d) the manufacturers name and recognized trade mark; e) the batch number; f) the date of manufacture; g) mixing and thinning instructions. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:
27、17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 BSI 16 February 2006 3 Table 1 Tests on liquid paint TestTest panel, preparation and paint system ConditionsTest methodRequirement 1) ConditionComponents in their original or laboratory containers BS EN ISO 1513Shall be free from extrane
28、ous matter and shall show no skinning, gelling, hard settlement or other defect that may prevent satisfactory application of a defect-free film. 2) Volatile organic compound (VOC) content When prepared for application as specified in B.2.1 !Process Guidance Note PG6/40“ Shall be less than or equal t
29、o the reference value.a 3) Shelf lifeAfter 12 months at 0 C to 35 C, components in their original containers Tests 1), 5) and 6) of this Table Shall conform to the requirements. 4) Pot life!4 h unless otherwise agreed between manufacturer and purchaser“ BS EN ISO 2431Viscosity shall not increase by
30、more than a factor of two from the initial value, unless otherwise specified by the purchaser. 5) ApplicationB.1.1, B.1.3 and B.2 a) After application Visual examination with normal corrected vision Paint film shall show an opaque even finish, free from runs, sags, wrinkling, pin-holing or other def
31、ect. B.1.1, B.1.3 and B.2 b) k 5 min after spraying, force drying at (125 5) C for 15 min and allowing to cool for 1 h Visual examination with normal corrected vision Paint film shall show an opaque even finish, free from runs, sags, wrinkling, pin-holing or other defect. 6) Drying timeB.1.1, B.1.3
32、and B.2 After applicationBS EN 29117Paint film shall be through-dry at k 1 h from application, unless otherwise specified by the purchaser. a The reference value shall be established during type approval unless agreed otherwise between manufacturer and purchaser (see Annex A). Licensed Copy: sheffie
33、ldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 4 BSI 16 February 2006 Table 2 Tests on the dry run TestTest panel, preparation and paint system ConditionsTest methodRequirement 1) ColourB.1.1, B.1.3 and B.2 24 h after application, under diffuse day
34、light BS 3900: Part D1Shall be yellow.a 2) Specular glossB.1.1, B.1.3 and B.2 24 h after application, using a 60 glossmeter BS 3900: Part D5Shall be less than or equal to 20 units.a 3) Water resistance B.1.1, B.1.2 and B.4 Immerse for 168 h at (23 2) C in water conforming to at least grade 3 of BS E
35、N ISO 3696 Method 1, procedure A of BS 3900: Part G5 k2 min after removal shall show no blistering or other film defects. BS 3900: Part E6, 1 mm spacing k2 min after removal shall be k class 2. 4) Flexibility (cupping test) B.1.1, B.1.2 and B.3 After 7 d air drying BS EN ISO 1520 ( 10 magnification)
36、 There shall be no cracking at an indentation depth of 4 mm. 5) Corrosion resistance (filiform) B.1.1, B.1.2 and B.4 Cut paint film through to substrate, penetrating the cladding, using a sharp blade; test for 1 000 h BS EN 3665There shall be no blistering or other film defect.b Corrosion shall not
37、spread more than 2 mm from cut. !6) Resistance to neutral salt spray B.1.1, B.1.3 and B.4 Cut paint film through to substrate, penetrating the cladding, using a sharp blade; test for 1 000 h BS EN ISO 7253There shall be no blistering, flaking or cracking.b Corrosion shall not spread more than 2 mm f
38、rom cut.“ a Unless otherwise specified by the purchaser. b BS 3900: Parts H2, H4 and H5 may prove useful when evaluating conformity. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 BSI 16 February 2006 5 Annex A (normative) Typ
39、e approval A.1 If the manufacturer is required to prove product conformity to this British Standard, the following shall be provided: a) test results conforming to this British Standard; b) wet samples of all materials; c) a declaration of composition, including the percentage and nature of all ingr
40、edients; d) reference values if required, e.g. VOC content. A.2 After type approval has been granted, there shall be no change in the product formulation unless this is approved by the approving authority. Annex B (normative) Preparation of test panels B.1 Preparation of substrate B.1.1 Use test pan
41、els made from unabraded aluminium sheet conforming to BS L 163:1978, and measuring approximately 150 mm 100 mm and 0.8 mm thick. B.1.2 Where specified (see Table 1 and Table 2), acid chromate pickle the panels in accordance with BS EN 2334. B.1.3 Where specified (see Table 1 and Table 2), detergent
42、degrease the panels as follows. Remove protective oil or grease either by vapour degreasing or solvent washing in accordance with BS EN 605. Allow to dry and immerse in a 10 % aqueous solution of aircraft cleaning detergent conforming to DEF STAN 79-17 2 for 15 min. Remove and wash with running tap
43、water for 1 min. Check that a water break-free surface is obtained. Rinse with water conforming to at least grade 3 of BS EN ISO 3696, and allow to dry. B.2 Pretreatment etch primer application B.2.1 Prepare the pretreatment etch primer by mixing the base and activator in the proportions specified a
44、nd thin as necessary with the appropriate thinners as recommended by the manufacturer. B.2.2 Spray the pretreatment etch primer on the test panels (see B.1), within 24 h of preparation, at a spreading rate sufficient to produce a single dry coat with a film thickness of (8 2) 4m, unless otherwise sp
45、ecified, and allow to dry vertically, with free air access, for 16 h to 24 h, unless otherwise specified. B.3 Primer application B.3.1 Prepare the primer by mixing the base and curing agent in the proportions specified by the manufacturer and thin as necessary with the appropriate thinners. B.3.2 Sp
46、ray the primer on the test panels primed in accordance with B.2, at a spreading rate sufficient to produce a single dry coat with a film thickness of (20 5) 4m, unless otherwise specified, and allow to dry vertically, with free air access, for 16 h to 24 h, unless otherwise specified. B.4 Finish app
47、lication B.4.1 Prepare the finish by mixing the base and curing agent in the proportions specified by the manufacturer and thin as necessary with the appropriate thinners. B.4.2 Spray the finish to the test panels primed in accordance with B.3, at a spreading rate sufficient to produce a single dry
48、coat with a film thickness of (40 5) 4m, unless otherwise specified, and allow to dry vertically, with free air access, for 7 d, unless otherwise specified. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 32:1998 BSI 16 February 20066
49、List of references (see Clause 2) Normative references BSI publications BS 282, 389:1963, Specification for lead chromes and zinc chromes for paints. BS 2015:1992, Glossary of paint and related terms. BS 3900, Methods of test for paints. BS 3900: Group A, Tests on liquid paints (excluding chemical tests). BS 3900: Part A2:1993, Examination and preparation of samples for testing. BS 3900: Group D, Optical tests on paint films. BS 3900: Part D1:1978, Visual comparison