1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58purposesICS 49.040Specification for pretreatment etch primer for aerospace BRITISH STANDARD AEROSPA
2、CE SERIESBS 2X 32:1998Incorporating Amendment No. 1BS 2X 32:1998This British Standard, 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 2006First published 28 June
3、 1991Second edition April 1998The following BSI references relate to the work on this standard:Committee reference ACE/44Draft for comment 96/705058 DCISBN 0 580 27977 4Ministry of DefenceNational Centre of TribologyOil and Colour Chemists AssociationSociety of British Aerospace CompaniesAmendments
4、issued since publicationAmd. No. Date Comments16019 February 2006 Amendments to Table 1 and Table 2Committees responsible for this British StandardThe preparation of this British Standard was entrusted to Technical Committee ACE/44, Protective treatments and aircraft finishes, upon which the followi
5、ng bodies were represented:British Coatings Federation Ltd.Metal Finishing AssociationBS 2X 32:1998 BSI 16 February 2006ContentsPageCommittees responsible Inside front coverForeword ii1Scope 12 References 13 Definitions 14 Materials 15 Performance 26Batch inspection 27 Marking 2Annex A (normative) T
6、ype approval 5Annex B (normative) Preparation of test panels 5List of references 6Table 1 Tests on liquid paint 3Table 2 Tests on the dry run 4iBS 2X 32:1998iione of a series for paints and varnishes suitable for aerospace purposes. It specifies requirements for a two pack pretreatment etch primer t
7、hat may be used with British Standard 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 It supersedes BS X 32:1991 which has been withdrawn.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 alt
8、ered by amendment is indicated in the 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 appropr
9、iately qualified and experienced people.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 f
10、or the use of substances and/or procedures 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 t
11、he necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 7 and a back
12、cover.The BSI copyright notice displayed in this document indicates when the document was last issued.ForewordThis British Standard has been prepared by Technical Committee ACE/44 and is BSI 16 February 2006BS 2X 32:19981 ScopeThis British Standard specifies requirements for the materials and perfor
13、mance 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 Referenc
14、es2.1 Normative referencesThis 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 app
15、lies; 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 referenc
16、esThis 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 DefinitionsFor the purposes of this Briti
17、sh Standard the definitions given in BS 2015 apply.4 Materials4.1 Composition4.1.1 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 activator
18、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 tetroxychromat
19、e (see 4.1.2) shall conform to zinc chrome type 3 of BS 282, 389:1963.4.2 Scheme components4.2.1 GeneralComponents 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 primerPretreatment etch primer shall conform to this British Standa
20、rd.4.2.3 PrimerPrimer shall conform to type A of BS X 33 unless otherwise specified.4.2.4 FinishFinish 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 separately assessed. BSI 16 Feb
21、ruary 20061BS 2X 32:19985 Performance5.1 General5.1.1 Test panels shall be prepared and coated as specified in Annex B.5.1.2 Unless otherwise specified, all tests shall be carried out in temperature and relative humidity conditions conforming to BS EN 23270.5.2 Tests on liquid paintPretreatment etch
22、 primer shall conform to Table 1.5.3 Tests on the dry filmThe dry paint film, prepared in accordance with Annex B, shall conform to Table 2.6 Batch inspectionBefore despatch, a representative sample of each batch of material, taken in accordance withBS EN 21512, shall be tested to confirm conformity
23、 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 material and material ingredients may be inspected at any stage of manufacture, and from any portion of the batch.7 MarkingIn addition to any statut
24、ory 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 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
25、mark;e) the batch number;f) the date of manufacture;g) mixing and thinning instructions.2 BSI 16 February 2006BS 2X 32:1998Table 1 Tests on liquid paintTest Test panel, preparation and paint systemConditions Test method Requirement1) Condition Components in their original or laboratory containersBS
26、EN ISO 1513 Shall be free from extraneous 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 P
27、G6/40“Shall be less than or equal to the reference value.a3) Shelf life After 12 months at 0 C to 35 C, components in their original containersTests 1), 5) and 6) of this TableShall conform to the requirements.4) Pot life !4 h unless otherwise agreed between manufacturer and purchaser“BS EN ISO 2431
28、 Viscosity shall not increase by more than a factor of two from the initial value, unless otherwise specified by the purchaser.5) Application B.1.1, B.1.3 and B.2a) After application Visual examination with normal corrected visionPaint film shall show an opaque even finish, free from runs, sags, wri
29、nkling, pin-holing or other defect.B.1.1, B.1.3 and B.2b) k 5 min after spraying, force drying at (125 5) C for 15 min and allowing to cool for 1 hVisual examination with normal corrected visionPaint film shall show an opaque even finish, free from runs, sags, wrinkling, pin-holing or other defect.6
30、) Drying time B.1.1, B.1.3 and B.2After application BS EN 29117 Paint film shall be through-dry at k 1 h from application, unless otherwise specified by the purchaser.aThe reference value shall be established during type approval unless agreed otherwise between manufacturer and purchaser (see Annex
31、A). BSI 16 February 20063BS 2X 32:1998Table 2 Tests on the dry runTest Test panel, preparation and paint systemConditions Test method Requirement1) Colour B.1.1, B.1.3 and B.224 h after application, under diffuse daylightBS 3900: Part D1 Shall be yellow.a2) Specular gloss B.1.1, B.1.3 and B.224 h af
32、ter application, using a 60 glossmeterBS 3900: Part D5 Shall be less than or equal to 20 units.a3) Water resistance B.1.1, B.1.2 and B.4Immerse for 168 h at (23 2) C in water conforming to at least grade 3 of BS EN ISO 3696Method 1, procedure A of BS 3900: Part G5k2 min after removal shall show no b
33、listering or other film defects.BS 3900: Part E6, 1 mm spacingk2 min after removal shall be k class 2.4) Flexibility (cupping test)B.1.1, B.1.2 and B.3After 7 d air drying BS EN ISO 1520 ( 10 magnification)There shall be no cracking at an indentation depth of 4 mm.5) Corrosion resistance (filiform)B
34、.1.1, B.1.2 and B.4Cut paint film through to substrate, penetrating the cladding, using a sharp blade; test for 1 000 hBS EN 3665 There shall be no blistering or other film defect.bCorrosion shall not spread more than 2 mm from cut.!6) Resistance to neutral salt sprayB.1.1, B.1.3 and B.4Cut paint fi
35、lm through to substrate, penetrating the cladding, using a sharp blade; test for 1 000 hBS EN ISO 7253 There shall be no blistering, flaking or cracking.bCorrosion shall not spread more than 2 mm from cut.“aUnless otherwise specified by the purchaser.bBS 3900: Parts H2, H4 and H5 may prove useful wh
36、en evaluating conformity.4 BSI 16 February 2006BS 2X 32:1998Annex A (normative) Type approvalA.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
37、) a declaration of composition, including the percentage and nature of all ingredients;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
38、) Preparation of test panelsB.1 Preparation of substrateB.1.1 Use test panels 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 wit
39、h BS EN 2334.B.1.3 Where specified (see Table 1 and Table 2), detergent 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 conf
40、orming to DEF STAN 79-17 2 for 15 min. Remove and wash with running tap 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 applicationB.2.1 Prepare the pretreatment etch
41、primer by mixing the base and activator in the proportions specified and 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 s
42、ingle dry coat with a film thickness of (8 2) 4m, unless otherwise specified, and allow to dry vertically, with free air access, for 16 h to 24 h, unless otherwise specified.B.3 Primer applicationB.3.1 Prepare the primer by mixing the base and curing agent in the proportions specified by the manufac
43、turer and thin as necessary with the appropriate thinners.B.3.2 Spray 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 ac
44、cess, for 16 h to 24 h, unless otherwise specified.B.4 Finish applicationB.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 wi
45、th B.3, at a spreading rate sufficient to produce a single dry 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. BSI 16 February 20065BS 2X 32:1998List of references (see Clause 2)Normative ref
46、erencesBSI publicationsBS 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 prepara
47、tion of samples for testing.BS 3900: Group D, Optical tests on paint films.BS 3900: Part D1:1978, Visual comparison of the colour of paints.BS 3900: Part D5:1995, Measurement of specular gloss of non-metallic paint films at 20, 60 and 85.BS 3900: Group E, Mechanical tests on paint films.BS 3900: Par
48、t E6:1992, Cross cut test.BS 3900: Group G, Environmental tests on paint films (including tests for resistance to corrosion and chemicals).BS 3900: Part G5:1993, Determination of resistance to liquids General methods.BS L 163:1978, Specification for sheet and strip of aluminum-coated aluminumcopperm
49、agnesium siliconmanganese alloy (solution treated, cold-worked for flattening and aged at room temperature) (Cu 4.4, Mg 0.5, Si 0.8, Mn 0.8).BS 2X 33:1998, Specification for two component epoxy primer for aerospace purposes.BS 2X 34:1998, Specification for two component polyurethane finish for aerospace purposes.BS EN 605:1992, Paints and varnishes Standard panels for testing.BS EN 23341), Specification for acid chromate pickle for aluminum alloys.BS EN 36651), Filiform corrosion resistance test f
