1、February 2014 Translation by DIN-Sprachendienst.English price group 14No part of this translation 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).I
2、CS 77.060!%,Be“2093166www.din.deDDIN EN 12496Galvanic anodes for cathodic protection in seawater and saline mud;English version EN 12496:2013,English translation of DIN EN 12496:2014-02Galvanische Anoden fr den kathodischen Schutz in Seewasser und salzhaltigemSchlamm;Englische Fassung EN 12496:2013,
3、Englische bersetzung von DIN EN 12496:2014-02Anodes galvaniques pour la protection cathodique dans leau de mer et les boues salines;Version anglaise EN 12496:2013,Traduction anglaise de DIN EN 12496:2014-02SupersedesDIN EN 12496:2013-09www.beuth.deIn case of doubt, the German-language original shall
4、 be considered authoritative.Document comprises 29 pages 01.14 DIN EN 12496:2014-02 2 A comma is used as the decimal marker. National foreword This document (EN 12496:2013) has been prepared by Technical Committee CEN/TC 219 “Cathodic protection” (Secretariat: BSI, United Kingdom), Working Group WG
5、3 “Cathodic protection of steel structures in seawater” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenstelle Schiffs- und Meerestechnik (Shipbuilding and Marine Technology Standards Committee), Working Committee NA 132-04-04 AA Korrosion. The Eur
6、opean Standards referred to in this document have been published as DIN EN or DIN EN ISO Standards with the same number. Amendments Compared with DIN EN 12496:2013-09, the following corrections have been made to the German version only and therefore do not affect the English text: a) Annex A.6, thir
7、d paragraph, has been corrected to read: “.by single cuts at 25 %, 50 % and 75 % of nominal length, .” (instead of 25 %, 33 % and 50 %); b) Annex C.2, first paragraph, has been corrected to read: “. at different current densities (0,003 A/m2to 10 A/m2).” (instead of 0,0005 A/m2 to 0,1 A/m2). Previou
8、s editions DIN EN 12496: 2013-09 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12496 June 2013 ICS 77.060 English Version Galvanic anodes for cathodic protection in seawater and saline mud Anodes galvaniques pour la protection cathodique dans leau de mer et les boues salines Galvanische Anode
9、n fr den kathodischen Schutz in Seewasser und salzhaltigem Schlamm This European Standard was approved by CEN on 25 April 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard
10、 without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any o
11、ther language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republi
12、c, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN CO
13、MMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12496:2013: EEN 12496:2013 (E) 2 Co
14、ntents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Galvanic anode materials and their properties 8 4.1 General 8 4.2 Anode alloy composition 8 4.3 Electrochemical properties 9 4.3.1 General 9 4.3.2 Potential 9 4.3.3 Current capacity.9 4.3.4 Anode c
15、onsumption rate . 10 5 Anode design and acceptance criteria . 10 5.1 General . 10 5.2 Chemical composition . 11 5.3 Physical properties . 11 5.4 Electrochemical testing . 11 5.5 Anode core materials . 12 5.6 Cable connections 13 Annex A (normative) Physical tolerances for galvanic anodes . 14 A.1 An
16、ode mass . 14 A.2 Anode dimensions and straightness 14 A.3 Steel core . 15 A.4 Anode surface irregularities 15 A.5 Cracks in cast anodic material 15 A.5.1 General . 15 A.5.2 Stand-off and flush mounting anodes 16 A.5.3 Bracelet anodes 16 A.6 Internal defects and destructive testing . 16 Annex B (inf
17、ormative) Composition and performance properties for galvanic anodes . 18 B.1 Aluminium alloys 18 B.1.1 Anode material 18 B.1.2 Electrochemical properties 19 B.2 Magnesium alloy . 20 B.2.1 Anode material 20 B.2.2 Electrochemical properties 21 B.3 Zinc alloy . 22 B.3.1 Anode material 22 B.3.2 Electro
18、chemical properties 23 Annex C (informative) Description of various electrochemical tests . 24 C.1 Free running test. 24 C.2 Galvanostatic test . 24 C.3 Potentiostatic test . 24 C.4 Quality control testing 25 Bibliography . 26 DIN EN 12496:2014-02 EN 12496:2013 (E)3 Foreword This document (EN 12496:
19、2013) has been prepared by Technical Committee CEN/TC 219 “Cathodic protection”, 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 December 2013, and conflic
20、ting national standards shall be withdrawn at the latest by December 2013. 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 t
21、o the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greec
22、e, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DINEN 12496:2014-02EN 12496:2013 (E)4 Introduction The anticipated performance, including design l
23、ife, of the cast galvanic anodes for use in sea water and saline mud is determined by their composition and the quality of their manufacture. This European Standard specifies the minimum requirements for the galvanic anodes quality levels and verification procedures. DIN EN 12496:2014-02 EN 12496:20
24、13 (E) 5 1 Scope This European Standard specifies the minimum requirements and gives recommendations for the chemical composition, the electrochemical properties, the physical tolerances, and the test and inspection procedures for cast galvanic anodes of aluminium, magnesium and zinc based alloys fo
25、r cathodic protection in sea water and saline mud. This European Standard is applicable to the majority of galvanic anodes used for seawater and saline mud applications, i.e. cast anodes of trapezoidal, “D“, or circular cross section and bracelet type anodes. The general requirements and recommendat
26、ions of this European Standard may also be applied to other anode shapes, e.g. half-spherical, button, etc., which are sometimes used for seawater applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for
27、its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 287-1, Qualification test of welders Fusion welding Part 1: Steels EN 12473, General principles of cathodic protection i
28、n sea water EN ISO 8044, Corrosion of metals and alloys Basic terms and definitions (ISO 8044) EN ISO 8501-1, Preparation of steel substrates before application of paints and related products Visual assessment of surface cleanliness Part 1: Rust grades and preparation grades of uncoated steel substr
29、ates and of steel substrates after overall removal of previous coatings (ISO 8501-1) EN ISO 15607, Specification and qualification of welding procedures for metallic materials General rules (ISO 15607) EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials Weldi
30、ng procedure specification Part 1: Arc welding (ISO 15609-1) ISO 10474:1991, Steel and steel products Inspection documents 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 8044 and EN 12473 and the following apply. 3.1 acidity presence of an excess
31、 of hydrogen ions over hydroxyl ions (pH 300 mm and 610 mm; iii) -0 / + 1 % for pipeline diameters 610 mm. 3) The dimensional tolerances on the anode thickness shall be 3 mm. At least 10 % of the total number of anodes shall be checked to confirm compliance with these requirements. DINEN 12496:2014-
32、02EN 12496:2013 (E) 15 Anodes shall be free from excessive bowing or twisting. This shall be verified on a completely assembled bracelet by fitting to a full-length former or by any other agreed method. The external diameter should at no point exceed the summation of the tolerances given above. A.3
33、Steel core The cross section dimensions of the anode core shall comply with the appropriate specification. The tolerances for the position of the core for bracelet and flush mounting anodes shall be 5 mm and for stand-off type anodes 10 % of anode material thickness covering the core. Anode core pro
34、trusions and any other specified critical dimensions shall be measured on samples of all anodes of each type and shall conform to specified requirements. A.4 Anode surface irregularities All anodes shall be inspected visually to confirm compliance with the following requirements. Shrinkage depressio
35、ns shall not exceed 10 % of the nominal thickness or depth of the anode, as measured from the uppermost corner to the bottom of the depression. Shrinkage depressions that expose the anode core are not acceptable. In the topping up area the maximum shrinkage shall not be more than 10 mm depth measure
36、d from a straight edge across the topping up face and not more than 0,5 % of the gross anode volume. Any additional topping up materials or casting surface irregularities shall be fully bonded with the bulk anode material. Cold shuts shall not exceed a depth of 10 mm and/or extend over a total lengt
37、h of more than 3 times the width of the anode (for stand-off and flush mounting anodes) or more than 150 mm (for bracelet anodes). All protrusions that are hazardous to personnel during handling shall be removed. A.5 Cracks in cast anodic material A.5.1 General All anodes shall be inspected visually
38、 to confirm compliance with the following requirements. Even with good foundry practice, particular anode alloy composition (notably aluminium based) may suffer a degree of cracking. Cracks may occur while cooling during the casting of galvanic anodes because of the different coefficients of expansi
39、on of the anode and the core. These cracks are not detrimental, provided they do not converge in a manner to allow loss of anode material. A small amount of warpage is acceptable if it does not adversely affect the anode installation. No treatment shall be applied to grind, peen, or in any other man
40、ner dress cracks before inspection and checks. Zinc and magnesium anodes shall be free from cracking visible without the aid of magnification. Small cracks in the anodes can be accepted in aluminium anodes provided the cracks would not cause any mechanical failure during installation, transportation
41、 or service of the anode. The combination of cracks and lack of bond to the core is detrimental. Visible cracks in the area where the anode material is not internally supported by the core shall not be accepted. Cracks penetrating to the steel core or penetrating through the anode are not permitted.
42、 DINEN 12496:2014-02EN 12496:2013 (E)16 A.5.2 Stand-off and flush mounting anodes For transverse cracks within the section of an anode wholly supported by the core, the following acceptance criteria shall be applied: Cracks within the section of an anode supported by the core are not acceptable if t
43、he length is more than 100 mm and/or the width is more than 1 mm. Maximum 10 cracks per anode. Cracks which follow the longitudinal direction of long slender anodes shall not be accepted. A.5.3 Bracelet anodes Cracks with a length of more than 100 mm or 50 % of the anode length (whichever is greater
44、) and/or cracks with a width greater than 3 mm are not acceptable. Provided the above is satisfied, the following cracks are acceptable in transverse direction: A maximum number of two cracks is acceptable if they do not exceed the following criteria. Cracks with a length of less than 50 mm or less
45、than 20 % of the anode diameter, whichever is less, and width less than 3 mm. Cracks with a length between 50 mm and 200 mm or between 20 % and 50 % of the anode diameter, whichever is less, and width less than 1 mm. Cracks with a length between 50 mm and 200 mm shall be limited to 2 per half bracel
46、et or 4 per anode. Cracks which follow the longitudinal direction of the anodes shall not exceed 100 mm or 20 % of anode length, whichever is less, and/or 1 mm in width. Acceptance criteria for other sizes of cracks would be dependent upon core and anode design. A.6 Internal defects and destructive
47、testing The number and method of selection of anodes to be destructively tested (sectioned) within each anode type/size shall take into account anode design, and the total number of anodes. If the anode does not meet the requirements below, an additional anode shall be subjected to destructive testi
48、ng. If this does not satisfy specified requirements, the whole anode lot should be rejected or other actions taken as agreed prior to fabrication. Slender and flush mounting anodes selected for examination shall be sectioned transversely by single cuts at 25 %, 50 %, and 75 % of nominal length, or at other agreed locations for a particular anode design. Bracelet anodes selected for examination shall be sectioned transversely by single cuts at 25 % and 50 % of nominal length, or at other agreed locations for a
