EN 12487:2007
(Main)Corrosion protection of metals - Rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys
Corrosion protection of metals - Rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys
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.
Korrosionsschutz von Metallen - Gespülte und no-rinse Chromatierüberzüge auf Aluminium und Aluminiumlegierungen
Diese Europäische Norm legt Anforderungen an gespülte und no-rinse Chromatierüberzüge auf Aluminium und Aluminiumlegierungen fest, die als Schutz gegen Korrosion oder als Basis für andere Beschichtungen dienen.
Protection contre la corrosion des métaux - Couches de conversion au chromate rincées et non rincées sur l'aluminium et les alliages d'aluminium
La présente Norme européenne spécifie les exigences relatives aux couches de conversion au chromate rincées et non rincées déposées sur l’aluminium ou les alliages d’aluminium pour les protéger contre la corrosion ou servir de base à d’autres couches.
Antikorozijska zaščita kovin - Kromatne prevleke na aluminiju in aluminijevih zlitinah, splaknjene ali nesplaknjene
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Standards Content (Sample)
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
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
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
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
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
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
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, making 10 movements. This treatment shall not leave any trace of staining on the paper.
7.3.3
If the test described in 7.3.2 is not sufficient to measure the adhesion of a conversion coating on aluminium, carry out a practical evaluation of the adhesion by measuring the adhesion of a secondary organic film applied to the chromated aluminium. 7.4 Coating mass per unit area For all but thin (type A) coatings, the coating mass per unit area of chromate and chromate-phosphate coatings on aluminium shall be determined in accordance with EN ISO 3892 or with the methods described in C.2 to C.4. For thin (type A) chromate coatings, the coating mass per unit area shall be determined in accordance with C.3 and C.4. NOTE For thin chromate coatings, the errors associated with the methods described in EN ISO 3892 are unacceptably high. 7.5 Coating identification 7.5.1 General The test methods specified in Annex D shall be used to determine the presence or absence of relevant chemical elements in the conversion coating. 7.5.2 Chromate conversion coatings (yellow) The presence of chromium and the absence of phosphate in the coating shall identify the layer as a chromate conversion coating. The layer may contain hexavalent chromium. 7.5.3 Chromate phosphate coatings (green) The presence of phosphate and chromium and the absence of zinc shall identify the layer as a chromate-phosphate conversion coating. The layer consists of trivalent chromium. SIST EN 12487:2007
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