1、July 2009DEUTSCHE NORM English price group 11No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.220.40!$XV-“1535110www
2、.din.deDDIN EN 15646Electrodeposited coatings Electroplated coatings of aluminium and aluminium alloys withsupplementary treatment Requirements and test methodsEnglish version of DIN EN 15646:2009-07Galvanische berzge Galvanische Aluminium- und Aluminium-Legierungs-berzge mit zustzlicherBehandlung A
3、nforderungen und PrfverfahrenEnglische Fassung DIN EN 15646:2009-07SupersedesDIN 50898:2005-12www.beuth.deDocument comprises 21 pagesDIN EN 15646:2009-07 2 National foreword This standard has been prepared by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” (Secretariat: BSI, U
4、nited Kingdom). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-01-76 AA Galvanische berzge. Amendments This standard differs from DIN 50898:2005-12 as follows: a) Since EN 15646:2009 h
5、as been adopted at German national level, the number of the standard has been changed. b) The standard has been editorially revised. Previous editions DIN 50898: 2005-12 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15646March 2009ICS 25.220.40English VersionElectrodeposited coatings - Electropl
6、ated coatings of aluminiumand aluminium alloys with supplementary treatment -Requirements and test methodsRevtements lectrolytiques - Dpts lectrolytiquesdaluminium et dalliages daluminium avec traitementcomplmentaire - Exigences et mthodes dessaiGalvanische berzge - Galvanische Aluminium- undAlumini
7、um-Legierungs-berzge mit zustzlicherBehandlung - Anforderungen und PrfverfahrenThis 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 nati
8、onal 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 an
9、y 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, Eston
10、ia, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHE
11、S KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15646:2009: EEN 15646:2009 (E) 2 Contents Page Foreword 4Introduction .51 Scope 72 Normative references 73
12、Terms and definitions .74 Information to be supplied by the purchaser .84.1 Essential information 84.2 Additional information 85 Designation 85.1 General 85.2 Substrate 95.3 Metallic coatings 95.3.1 General 95.3.2 Intermediate coatings . 105.4 Heat treatment . 105.5 Supplementary treatment 105.5.1 G
13、eneral . 105.5.2 Conversion coatings 105.5.3 Other supplementary treatments 105.6 Designation examples 106 Coating types and application . 116.1 Aluminium coatings 116.2 Aluminium alloy coatings 117 Requirements 117.1 General . 117.2 Appearance . 127.3 Coating thickness . 127.4 Adhesion 127.5 Corros
14、ion resistance in accelerated salt spray test . 127.5.1 General . 127.5.2 Samples . 137.5.3 Requirements for corrosion resistance . 137.6 Corrective actions. 138 Test methods . 139 Sampling 14Annex A (normative) Corrosion tests 15A.1 Alternating immersion test in accordance with EN ISO 11130:1999 .
15、15A.2 Test solution 15A.3 Standard atmosphere . 15A.4 Test . 15Annex B (informative) Fields of application 16B.1 Riveted joints, retaining ring bolts 16B.2 Welded components, e.g. welding studs . 16B.3 High temperature applications 16B.4 Sea water resistance 16B.5 Aerospace 16DIN EN 15646:2009-07 EN
16、 15646:2009 (E) 3 Annex C (informative) General process information . 17C.1 Procedure . 17C.2 Surface pretreatment 17C.3 Coating systems 18Bibliography 19DIN EN 15646:2009-07 EN 15646:2009 (E) 4 Foreword This document (EN 15646:2009) has been prepared by Technical Committee CEN/TC 262 “Metallic and
17、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 lat
18、est 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
19、 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, Pola
20、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 15646:2009-07 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 emb
21、rittlement 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 electroplati
22、ng 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 pla
23、ce, 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. con
24、version 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,
25、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 effec
26、t 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. Fo
27、r 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
28、 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 pate
29、nt 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
30、may be obtained from: Aluminal Oberflchentechnik GmbH 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;
31、 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 prod
32、uct (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, c
33、orrosion 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 Additional information When applicable, the following additional information shall be
34、 supplied by the purchaser: a) any special requirements for, or restrictions on, preparation of the articles to be coated; b) any special requirements for recovering rejected articles; c) any special requirements that depend on the shape or method of manufacturing of the component; d) any other spec
35、ial requirements (e.g. roughness and tolerances). 5 Designation 5.1 General The designation shall comprise the following: a) electrodeposited coating; DIN EN 15646:2009-07 EN 15646:2009 (E) 9 b) the number of the European Standard to which the required coating shall conform; c) a hyphen; d) the subs
36、trate code (see 5.2); e) a solidus; f) the additional applicable codes separated by solidi for every stage of the coating sequence, in the order of application (see 5.3, 5.4 and 5.5). NOTE 1 Examples of codes are given in Table 1 and examples of full designations are given in 5.6. Double separators
37、shall be used to indicate any missing stages (i.e. when a particular stage is not required). NOTE 2 The purchaser should be guided in his choice of designation by the severity of service conditions to be withstood by the coating, expressed as the service condition number (see ISO 27830 1). 5.2 Subst
38、rate For the designation of the substrate Table 1 shall apply. Additionally nickel materials shall be identified with the chemical symbol Ni and titanium materials with the chemical symbol Ti. Table 1 Code examples Substrate code (see 5.2) Electrodeposited coating code (see 5.3) Chromate conversion
39、code (see 5.5) Fe Ti Ni PL NM iron or steel titanium nickel plastics non-metallic materials Al Aluminium A C1 E1 colourless yellow iridescent light green NOTE If the standard designation of the metal is to be provided, references to the appropriate literature can be found in Bibliography references
40、2, 3, 4, 5, 6 and 7. The letters PL shall be used for electroplatable plastics and the letters NM for other non-metallic materials. The intermediate layers shall be designated in accordance with EN 12540 and EN ISO 4527. 5.3 Metallic coatings 5.3.1 General The designation of electrodeposited alumini
41、um coatings shall be its chemical symbol Al. The designation of aluminium alloy coatings shall be as follows. The metal coating layer is designated by the chemical symbol(s) for the electrodeposited metal, or metals (in the case of an alloy coating), immediately followed by: a) a number indicating t
42、he minimum local thickness of the layer in micrometres (see Clause 6); b) upper case letters indicating the type of coating, if applicable (see below). DIN EN 15646:2009-07 EN 15646:2009 (E) 10 When the coating metal is an aluminium alloy, the symbol Al shall be followed by the chemical symbol for e
43、ach minor component. Each chemical symbol for a minor component shall be followed by a whole number in parentheses designating its nominal percentage by mass. However, if the percentage mass of a minor component is less than 1 %, then it shall be designated to one decimal place. The decimal sign sha
44、ll be indicated by a comma on the line. 5.3.2 Intermediate coatings The intermediate layers shall be designated in accordance with EN 12540 or EN ISO 4527, respectively. 5.4 Heat treatment The heat treatment designation shall comprise: a) the letters “HT“; b) in parentheses, the minimum temperature
45、specified, in degrees Celsius; c) the duration, in hours. EXAMPLE A heat treatment to be carried out for 3 h at a minimum temperature of 190 C has the following designation: HT(190)3. 5.5 Supplementary treatment 5.5.1 General The supplementary treatments, if required, shall be conducted immediately
46、after electroplating. 5.5.2 Conversion coatings The application of conversion coatings shall be agreed upon between the contracting parties. Conversion coatings shall be designated in accordance with EN 12487:2000, Table 1. 5.5.3 Other supplementary treatments Other supplementary treatment shall be
47、agreed upon between the contracting parties. EXAMPLE Other supplementary treatments include the use of a sealant coating on a polymer base (polyester varnish), or the application of a lubricant for reducing the friction values. 5.6 Designation examples The following are examples of designations. EXA
48、MPLE 1 A coating of 12 m aluminium (Al12) on a component of iron (Fe) with a yellow iridescent chromate conversion coating (C1) has the following designation: Electrodeposited coating EN 15646 Fe/Al12/C1 DIN EN 15646:2009-07 EN 15646:2009 (E) 11 EXAMPLE 2 A coating of 12 m aluminium (Al12) on a comp
49、onent of iron (Fe) with a yellow iridescent chromate conversion coating (C1), which has been subsequently treated with an inorganic or organic sealant (T2), has the following designation: Electrodeposited coating EN 15646 Fe/Al12/C1/T2 EXAMPLE 3 A coating of 12 m aluminium (Al12) on top of an intermediate coating of 2 m non-polished
