SIST EN 2437:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Chromate conversion coatings (yellow) for aluminium and aluminium alloysLuft- und Raumfahrt - Gelbchromatieren von Aluminium und AluminiumlegierungenSérie aérospatiale - Chromatisation jaune de l'aluminium et des alliages d'aluminiumAerospace series - Chromate conversion coatings (yellow) for aluminium and aluminium alloys49.040Prevleke in z njimi povezani postopki, ki se uporabljajo v letalski in vesoljski industrijiCoatings and related processes used in aerospace industry49.025.20AluminijAluminiumICS:Ta slovenski standard je istoveten z:EN 2437:2001SIST EN 2437:2004en01-maj-2004SIST EN 2437:2004SLOVENSKI
STANDARD



SIST EN 2437:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2437December 2001ICS 49.040English versionAerospace series - Chromate conversion coatings (yellow) foraluminium and aluminium alloysSérie aérospatiale - Chromatation jaune de l'aluminium etdes alliages d'aluminiumLuft- und Raumfahrt - Gelbchromatieren von Aluminiumund AluminiumlegierungenThis European Standard was approved by CEN on 2 May 2001.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2437:2001 ESIST EN 2437:2004



EN 2437:2001 (E)2ForewordThis European Standard has been prepared by the European Association of Aerospace Manufacturers(AECMA).After inquiries and votes carried out in accordance with the rules of this Association, this Standard hasreceived the approval of the National Associations and the Official Services of the member countries ofAECMA, prior to its presentation to CEN.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by June 2002, and conflicting national standards shall be withdrawn atthe latest by June 2002.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and the United Kingdom.SIST EN 2437:2004



EN 2437:2001 (E)31ScopeThis standard specifies yellow chromate conversion coating of aluminium and aluminium alloys.It shall be applicable wherever referenced.2Purpose of processTo increase corrosion resistance and to improve the adhesion of paints and varnishes.Type B coatings are also suitable for the repair of mechanically damaged anodic coatings.3Normative referencesThis European Standard incorporates by dated or undated reference provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications apply tothis European Standard only when incorporated in it by amendment or revision. For undated references thelatest edition of the publication referred to applies.ISO 8081Aerospace process - Chemical conversion coating for aluminium alloys - General purposeISO 9227Corrosion tests in artificial atmospheres - Salt spray testsEN 2000Aerospace series - Quality assurance - EN aerospace products - Approval of the qualitysystem of manufacturersEN 2334Aerospace series - Acid chromate pickling of aluminium and aluminium alloys 1)EN 3997Aerospace series - Aluminium alloy AL-P2024- - T3 - Sheet and strip - 0,4 mm
a
6 mm 2)4DefinitionsFor the purposes of this standard, the following definition applies:batchparts treated at the same time in the same bath.5Classification5.1Thickness–Type A: Mass per unit area from 0,2 g/m2 to 0,42 g/m2 for slight corrosion protection, where lowelectrical resistance is required;–Type B: Mass per unit area from
0,42 g/m2 to 1,2 g/m2 for good corrosion protection, with or withoutpainting.1)Published as AECMA Standard at the date of publication of this standard2)Published as AECMA Prestandard at the date of publication of this standardSIST EN 2437:2004



EN 2437:2001 (E)45.2Materials–Category 1: Aluminium alloy with an Si-content
3,5 %;–Category 2: Aluminium alloy with an Si-content
3,5 %.6Information for the processor–Designation, see 16.–Areas not to be chromated.7Condition of parts prior to processingSoldering, welding, mechanical operations and heat treatments (except for cold storage) shall be completed.The parts to be chromate coated after assembly (e.g. by spot welding) shall be pickled prior to assembly.Areas not to be chromate coated shall be suitably masked.8Pre-treatment8.1CleaningThe cleaning method shall be chosen according to the degree of contamination of the materials to be treated.In general, the most effective method is degreasing with solvents followed by cleaning in an alkaline solution(see annex A, A.2).8.2RinsingThe parts shall be rinsed thoroughly, e.g. by immersion followed by spray washing. It is recommended that afurther rinsing be carried out in deionised water with a maximum specific conductivity of 100 S
cm–1.8.3PicklingIt shall not cause pitting or any alterations to the metallurgical characteristics or mechanical strength of thematerial.The dimensions and the surfaces roughness value indicated on the drawings shall be observed.Pickling is normally carried out in a solution containing chromate. Other methods may be used (seeannex A, A.4).8.4RinsingSee 8.2.SIST EN 2437:2004



EN 2437:2001 (E)59TreatmentThe parts are submerged in a still or agitated bath or tre
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