SIST EN 12487:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.DOXPLQLMHYLKKorrosionsschutz von Metallen - Gespülte und no-rinse Chromatierüberzüge auf Aluminium und AluminiumlegierungenProtection contre la corrosion des métaux - Couches de conversion au chromate rincées et non rincées sur l'aluminium et les alliages d'aluminiumCorrosion protection of metals - Rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys77.120.10Aluminij in aluminijeve zlitineAluminium and aluminium alloys25.220.40Kovinske prevlekeMetallic coatingsICS:Ta slovenski standard je istoveten z:EN 12487:2007SIST EN 12487:2007en,fr,de01-junij-2007SIST EN 12487:2007SLOVENSKI
STANDARDSIST EN 12487:20001DGRPHãþD



SIST EN 12487:2007



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12487April 2007ICS 25.220.40Supersedes EN 12487:2000
English VersionCorrosion protection of metals - Rinsed and non-rinsedchromate conversion coatings on aluminium and aluminiumalloysProtection contre la corrosion des métaux - Couches deconversion au chromate rincées et non rincées surl'aluminium et les alliages d'aluminiumKorrosionsschutz von Metallen - Gespülte und no-rinseChromatierüberzüge auf Aluminium undAluminiumlegierungenThis European Standard was approved by CEN on 24 February 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12487:2007: ESIST EN 12487:2007



EN 12487:2007 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Information to be supplied by the purchaser.5 4 Coating types and designation.5 4.1 Coating types.5 4.2 Conversion coating designation.6 5 Sampling.6 6 Coating requirements.7 6.1 General.7 6.2 Electrical insulation.7 6.3 Adhesion.7 6.4 Coating mass per unit area.7 6.5 Coating identification.7 6.6 Corrosion resistance.8 Annex A (informative)
Process systems.9 Annex B (normative)
After-treatments.12 Annex C (normative)
Analytical methods for the determination of the coating mass and for the identification of chromium, phosphorus and zinc.13 Annex D (normative)
Testing of the layer composition.14 Bibliography.16
SIST EN 12487:2007



EN 12487:2007 (E) 3 Foreword This document (EN 12487:2007) has been prepared by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings”, the secretariat of which is held by BSI. 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 October 2007, and conflicting national standards shall be withdrawn at the latest by October 2007. This document supersedes EN 12487:2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 12487:2007



EN 12487:2007 (E) 4
1 Scope This European Standard specifies requirements for rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys intended to protect against corrosion and serve as a base for other coatings. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 485-1, Aluminium and aluminium alloys - Sheet, strip and plate - Part 1: Technical conditions for inspection and delivery EN 485-2, Aluminium and aluminium alloys - Sheet, strip and plate - Part 2: Mechanical properties EN 485-3, Aluminium and aluminium alloys - Sheet, strip and plate - Part 3: Tolerances on dimensions and form for hot-rolled products EN 485-4, Aluminium and aluminium alloys - Sheet, strip and plate - Part 4: Tolerances on shape and dimensions for cold-rolled products EN 515, Aluminium and aluminium alloys – Wrought products – Temper designations EN 573-1, Aluminium and aluminium alloys — Chemical composition and form of wrought products — Part 1: Numerical designation system EN 573-2, Aluminium and aluminium alloys — Chemical composition and form of wrought products — Part 2: Chemical symbol based designation system EN 573-3, Aluminium and aluminium alloys — Chemical composition and form of wrought products — Part 3: Chemical composition EN ISO 3892, Conversion coatings on metallic materials — Determination of coating mass per unit area — Gravimetric methods (ISO 3892:2000) EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227:2006) ISO 4519, Electrodeposited metallic coatings and related finishes — Sampling procedures for inspection by attributes IEC 60603-1, Connectors for frequencies below 3 MHz for use with printed boards - Part 1: Generic specification - General requirements and guide for the preparation of detail specifications, with assessed
quality (IEC 60603-1:1991 + A1:1992) 3
Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 rinsed chromate coating chromate coating that is rinsed in water prior to drying SIST EN 12487:2007



EN 12487:2007 (E) 5 NOTE This type of coating is typically applied to extruded and rolled aluminium fabricated parts, castings and long coils. 3.2 non-rinsed chromate coating coil coating chromate coating that is dried immediately after the chromating step without receiving a water rinse
NOTE This type of coating is normally used on long coils of aluminium sheet stock that receive immediate painting or adhesive coating.
4 Information to be supplied by the purchaser The following information shall be supplied by the purchaser: a) coating designation (see clause 5); b) sampling methods, acceptance levels or any other inspection requirements if different from those given in ISO 4519 (see clause 6); c) surface preparation prior to chromate conversion coating (see Annex A for guidance);
d) requirements for adhesion (see 7.3) and corrosion resistance (see 7.6); e) nature, condition and finish of the basis metal, if any of these could affect the serviceability and/or appearance of the coating. WARNING —Use of this standard can involve hazardous materials, operations and equipment. This standard does not purport to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Chemicals and materials shall be used and disposed of in a professional and environmentally suitable manner. 5 Coating types and designation 5.1 Coating types A conversion coating shall be referred to as type A, type C1, or type E1 in accordance with Table 1. NOTE Annex A provides guidance on coating type, purpose, end use and mass per unit area. SIST EN 12487:2007



EN 12487:2007 (E) 6
Table 1 — Types of chromate conversion coating Type Appearance Coating mass per unit area(g/m²) Other properties A Colourless 0,05 to 0,2 Decorative, low insulation resistance C1 Yellow (light to iridescent) 0,4 to 1,0 Used as a paint base and for bonding to rubber E1 Light green 0,4 to 1,2 Used as a paint base and for bonding to rubber NOTE For chromated long coils for types C1 and E1, the coating mass 0,5 g/m2 to 0,8 g/m2 is recommended.
5.2 Conversion coating designation The conversion coating designation shall be comprised of the following: a) number of this European Standard; b) hyphen; c) aluminium alloy designation in accordance with EN 573-1, EN 573-2 and EN 573-3 (wrought aluminium alloys), EN 485 parts 1 through 4 (cast aluminium alloys) and the temper designation in accordance with EN 515; d) solidus; e) symbol designating the type of coating (see Table 1 and NOTE 1 below). If the chromate conversion coating has to be after-treated, the designation shall also be comprised of the following: f) solidus; g) symbol indicating any after-treatment of the conversion coating as specified in Table B.1, Annex B (also see NOTE 2 below). NOTE 1 It is recommended that the chemical symbol is followed by the standard designation of the basis metal. NOTE 2 This can be repeated if more after-treatments are required. EXAMPLE The designation of a chromate conversion coating with a coating mass of 0,4 g/m2 to 1,2 g/m2 (E1) on wrought aluminium alloy EN AW-6060 T6, that has been after-treated with the application of inorganic or organic sealant (T2) is: Chromate conversion coating EN 12487-EN AW 6060 T6/E1/T2. 6 Sampling Sampling shall either be carried out in accordance with ISO 4519 or as specified by the purchaser (see
clause 4, b)). SIST EN 12487:2007



EN 12487:2007 (E) 7 7 Coating requirements 7.1 General Any tests (including corrosion resistance tests) shall be deferred until the expiry of a 24 h period after treatment. NOTE Conversion coatings harden with age by gradual dehydration; they should, therefore, be handled carefully for the first 24 h after the last treatment. 7.2 Electrical insulation When measured at an open circuit voltage of 9 V and a current of 2 A in accordance with IEC 60603-1, the resistance between an electrical contact and the aluminium shall be less than 0,1 Ω for type A, type C1 and type E1 coatings. 7.3 Adhesion 7.3.1
The coatings shall be adherent and non-powdery. The conversion coating shall pass the test described in 7.3.2 or 7.3.3. 7.3.2
Rub the dried surface with white soft tissue paper using normal hand pressure, maki
...