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STANDARD
SIST EN 15646:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15646March 2009ICS 25.220.40 English VersionElectrodeposited coatings - Electroplated coatings of aluminiumand aluminium alloys with supplementary treatment -Requirements and test methodsRevêtements électrolytiques - Dépôts électrolytiquesd'aluminium et d'alliages d'aluminium avec traitementcomplémentaire - Exigences et méthodes d'essaiGalvanische Überzüge - Galvanische Aluminium- undAluminium-Legierungs-Überzüge mit zusätzlicherBehandlung - Anforderungen und PrüfverfahrenThis European Standard was approved by CEN on 14 February 2009.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:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15646:2009: ESIST EN 15646:2009
EN 15646:2009 (E) 2 Contents Page Foreword .4Introduction .51Scope .72Normative references .73Terms and definitions .74Information to be supplied by the purchaser .84.1Essential information .84.2Additional information .85Designation .85.1General .85.2Substrate .95.3Metallic coatings .95.3.1General .95.3.2Intermediate coatings . 105.4Heat treatment . 105.5Supplementary treatment . 105.5.1General . 105.5.2Conversion coatings . 105.5.3Other supplementary treatments . 105.6Designation examples . 106Coating types and application . 116.1Aluminium coatings. 116.2Aluminium alloy coatings . 117Requirements . 117.1General . 117.2Appearance . 127.3Coating thickness . 127.4Adhesion . 127.5Corrosion resistance in accelerated salt spray test . 127.5.1General . 127.5.2Samples . 137.5.3Requirements for corrosion resistance . 137.6Corrective actions. 138Test methods . 139Sampling . 14Annex A (normative)
Corrosion tests . 15A.1Alternating immersion test in accordance with EN ISO 11130:1999 . 15A.2Test solution . 15A.3Standard atmosphere . 15A.4Test . 15Annex B (informative)
Fields of application . 16B.1Riveted joints, retaining ring bolts . 16B.2Welded components, e.g. welding studs . 16B.3High temperature applications . 16B.4Sea water resistance . 16B.5Aerospace . 16SIST EN 15646:2009
EN 15646:2009 (E) 3 Annex C (informative)
General process information . 17C.1Procedure . 17C.2Surface pretreatment . 17C.3Coating systems . 18Bibliography . 19 SIST EN 15646:2009
EN 15646:2009 (E) 4 Foreword This document (EN 15646:2009) 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 September 2009, and conflicting national standards shall be withdrawn at the latest by September 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. 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 the United Kingdom. SIST EN 15646:2009
EN 15646:2009 (E) 5 Introduction Electroplating of aluminium and aluminium alloy coatings provides several advantages: coating temperature (approximately 80 °C to 100 °C); no hydrogen embrittlement due to the electrodeposition of aluminium. Prevention of hydrogen embrittlement results from the (process) technology of electroplating, because it is conducted in aprotic, organic solvents, in which the aluminium is dissolved as an aluminium-organic complex. To protect these electroplating solutions from humidity (water) and air oxygen, the electroplating of aluminium is performed under an inert gas atmosphere of nitrogen or argon. For anodic material aluminium is used, which has a purity of > 99,7 %. During electroplating of aluminium a purification (electrolytic refining) takes place, which results in an aluminium coating with a purity of 99,99 % Al percentage by mass. The high level of purity of the aluminium forms the basis for corrosion protection. The corrosion protection of the aluminium coating can be increased by common procedures of aluminium after-treatment, e.g. conversion coatings. The corrosion behaviour in chlorine-containing media is based on the fact that pure aluminium has a low self-corrosion because the aluminium is passivated by a thin oxide layer due to air oxygen. The oxide layer of the pure-aluminium coating is stable in the pH range from 4,0 to 8,5. Corrosion damage does not result in voluminous corrosion products. The electrodeposited aluminium coatings cathodically protect iron materials. However, polarization effects in chlorine-free media, e.g. condensed water, may result in an anodic protective behaviour in such electrolytes. This effect can be reduced by alloying, for example, zinc or magnesium to the aluminium. Due to low dissolution current densities and extensive freedom of pores, the coatings can be suitable as galvanic corrosion protection on less reactive (more precious) materials like stainless steels and copper alloys. For adhesion reasons the application of a nickel strike may become necessary. High ductility of the coatings allows an extreme deformation of the work pieces in the electroplated state. The European Committee for Standardization (CEN) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning the use of individual electrolyte (electroplating solution) formulations to electrodeposit aluminium and/or aluminium alloys as given in Subclause 3.2 and Annex C. CEN takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured CEN that he is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with CEN. Information may be obtained from: Aluminal Oberflächentechnik GmbH & Co.KG Auf der Birke 2 D-56412
Heiligenroth Rasant-Alotec Beschichtungstechnik GmbH Zur Kaule 1 D-51491
Overath Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. CEN shall not be held responsible for identifying any or all such patent rights.” SIST EN 15646:2009
EN 15646:2009 (E) 6 WARNING — When using this standard, the legal safety regulations, e.g. ordinance on hazardous substances, list of MAC values, list of the values of technical limit concentration (TRK-Werte) and other technical regulations, shall be observed. SIST EN 15646:2009
EN 15646:2009 (E) 7 1 Scope This European Standard specifies requirements for electrodeposited aluminium and aluminium alloy coatings on iron materials, plastic substrates, titanium materials, nickel materials and non-metallic substrate materials rendered conductive, such as plastics. The coatings serve either as corrosion or galvanic corrosion protection, as well as for other technical applications. 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 10025-2, Hot rolled products of structural steels – Part 2: Technical delivery conditions for non-alloy structural steels EN 12487:2000, Corrosion protection of metals – Rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys EN 12508:2000, Corrosion protection of metal and alloys – Surface treatment, metallic, and other inorganic coatings – Vocabulary EN 12540, Corrosion protection of metals – Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and copper plus nickel plus chromium EN ISO 2819:1994, Metallic coatings on metallic substrates – Electrodeposited and chemically deposited coatings – Review of methods available for testing adhesion (ISO 2819:1980) EN ISO 4527, Metallic coatings – Autocatalytic (electroless) nickel-phosphorous alloy coatings – Specification and test methods (ISO 4527:2003) EN ISO 9227:2006, Corrosion tests in artificial atmospheres – Salt spray tests (ISO 9227:2006) EN ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates – Rating of test specimens and manufactured articles subjected to corrosion tests (ISO 10289:1999) EN ISO 11130:1999, Corrosion of metals and alloys – Alternate immersion test in salt solution (ISO 11130:1999) ISO 554:1976, Standard atmospheres for conditioning and/or testing – Specifications ISO 4519, Electrodeposited metallic coatings and related finishes – Sampling procedures for inspection by attributes 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12508:2000 and the following apply. 3.1 aprotic solution solution using non-aqueous inert solvent EXAMPLE Aromatic hydrocarbons. SIST EN 15646:2009
EN 15646:2009 (E) 8 3.2 complex aluminium compound compound based on trialkylaluminium compounds (AlR3 with R = H, CH3, C2H5 or higher homolog(ue)s as well as mixtures of these) with at least one alkaline metal (Li, Na, K, Cs, Rb) or one ammonium ion (NH4+) 4 Information to be supplied by the purchaser 4.1 Essential information The purchaser shall supply the following information: a) the designation (see Clause 5) of the particular coating required; b) the requirements for tensile strength of steel and any requirement for heat treatment before (see 5.4) and/or after (see C.2.2) electrodeposition; c) the significant surface, indicated by drawings of the articles or by suitably marked samples; d) the nature, condition and finish of the substrate, if any of these could affect the serviceability and/or the appearance of the coating;
e) the position on the surface for unavoidable defects, such as rack or contact marks and the limits for acceptable defects on the refined and non-refined product (see 7.2); f) the finish required, for example bright, dull, satin or other finish, preferably with a sample of the finish; g) sampling methods, acceptance levels or any other inspection requirements, if different from those given in ISO 4519 (see Clause 9); h) the standards for any thickness, corrosion or adhesion test requirements (see Clause 8); i) requirements for supplementary treatment if applicable (see 5.5);
j) any requirements for a mass fraction of alloy elements greater than 30 % (see 6.2). 4.2 A
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