1、BS EN 15646:2009ICS 25.220.40,NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDElectrodepositedcoatings Electroplated coatingsof aluminium andaluminium alloyswith supplementarytreatment Requirements and testmethodsThis British Standardwas published under theautho
2、rity of the StandardsPolicy and StrategyCommittee on 30 April2009 BSI 2009ISBN 978 0 580 58335 3Amendments/corrigenda issued since publicationDate CommentsBS EN 15646:2009National forewordThis British Standard is the UK implementation of EN 15646:2009.The UK participation in its preparation was entr
3、usted to TechnicalCommittee STI/33, Electrodeposited and related coatings.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct app
4、lication.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 15646:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15646March 2009ICS 25.220.40English VersionElectrodeposited coatings - Electroplated coatings of aluminiumand aluminium alloys with supplementary
5、 treatment -Requirements and test methodsRevtements lectrolytiques - Dpts lectrolytiquesdaluminium et dalliages daluminium avec traitementcomplmentaire - Exigences et mthodes dessaiGalvanische berzge - Galvanische Aluminium- undAluminium-Legierungs-berzge mit zustzlicherBehandlung - Anforderungen un
6、d 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 national standard without any alteration. Up-to-date lists and biblio
7、graphical 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
8、 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, I
9、taly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 B
10、russels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15646:2009: EBS EN 15646:2009EN 15646:2009 (E) 2 Contents Page Foreword 4Introduction .51 Scope 72 Normative references 73 Terms and definitions .74 Information to be suppl
11、ied 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 General . 105.5.2 Conversion coatings 105.5.3 Othe
12、r 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 Corrosion resistance in accelerated salt spray test . 1
13、27.5.1 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 . 15A.2 Test solution 15A.3 Standard atmosphere . 1
14、5A.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 16BS EN 15646:2009EN 15646:2009 (E) 3 Annex C (informative) General proces
15、s information . 17C.1 Procedure . 17C.2 Surface pretreatment 17C.3 Coating systems 18Bibliography 19BS EN 15646:2009EN 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
16、 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 possibilit
17、y 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 bou
18、nd 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, S
19、witzerland and the United Kingdom. BS EN 15646:2009EN 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
20、 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 electropl
21、ating 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
22、 % 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
23、 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 prod
24、ucts. 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
25、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
26、 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 us
27、e 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 h
28、e 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 Oberflchentechnik GmbH b) the req
29、uirements 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
30、 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,
31、 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) requir
32、ements 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 supplied by the purchaser: a) any special requirements for, or
33、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 special requirements (e.g. roughness and tolerances). 5 Designation
34、5.1 General The designation shall comprise the following: a) electrodeposited coating; BS EN 15646:2009EN 15646:2009 (E) 9 b) the number of the European Standard to which the required coating shall conform; c) a hyphen; d) the substrate code (see 5.2); e) a solidus; f) the additional applicable code
35、s 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 shall be used to indicate any missing stages (i.e. when a particular
36、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 Substrate For the designation of the substrate Table 1 shall apply. Additi
37、onally 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 code (see 5.5) Fe Ti Ni PL NM iron or steel titanium nickel plastics
38、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 2, 3, 4, 5, 6 and 7. The letters PL shall be used for electroplatable
39、 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 aluminium coatings shall be its chemical symbol Al. The designation of alumi
40、nium 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 the minimum local thickness of the layer in micrometres (see Clause 6)
41、; b) upper case letters indicating the type of coating, if applicable (see below). BS EN 15646:2009EN 15646:2009 (E) 10 When the coating metal is an aluminium alloy, the symbol Al shall be followed by the chemical symbol for each minor component. Each chemical symbol for a minor component shall be f
42、ollowed 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 shall be indicated by a comma on the line. 5.3.2 Intermediate coatings The in
43、termediate 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 specified, in degrees Celsius; c) the duration, in hours. EXAMPLE A heat t
44、reatment 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 after electroplating. 5.5.2 Conversion coatings The application of convers
45、ion 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 agreed upon between the contracting parties. EXAMPLE Other supplementary t
46、reatments 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. EXAMPLE 1 A coating of 12 m aluminium (Al12) on a component of iron (Fe) with
47、 a yellow iridescent chromate conversion coating (C1) has the following designation: Electrodeposited coating EN 15646 Fe/Al12/C1 BS EN 15646:2009EN 15646:2009 (E) 11 EXAMPLE 2 A coating of 12 m aluminium (Al12) on a component of iron (Fe) with a yellow iridescent chromate conversion coating (C1), w
48、hich 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 dull nickel (Nis2) on a component of iron (F
49、e) with a yellow iridescent chromate conversion coating (C1) has the following designation: Electrodeposited coating EN 15646 Fe/Nis2/Al12/C1 6 Coating types and application 6.1 Aluminium coatings The electrodeposited aluminium coatings shall be deposited from an aprotic solution. For this, e.g. compounds of the type MX2 AlR3should be used (c
