BS EN 1965-2-2011 Structural adhesives Corrosion Determination and classification of corrosion to a brass substrate《结构胶粘剂 腐蚀 黄铜衬底腐蚀性测定和分类》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1965-2:2011Structural adhesives CorrosionPart 2: Determination and classification ofcorrosion to a brass substrateBS EN 1965-2:2011 BRITISH STANDARDNational forewordThis Br

2、itish Standard is the UK implementation of EN 1965-2:2011. Itsupersedes BS EN 1965-2:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can beobtained on request to its secretary.

3、This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 72247 9ICS 77.060; 83.180Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publishe

4、d under the authority of theStandards Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationDate Text affectedBS EN 1965-2:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1965-2 May 2011 ICS 77.060; 83.180 Supersedes EN 1965-2:2001English Version Structural adhesiv

5、es - Corrosion - Part 2: Determination and classification of corrosion to a brass substrate Adhsifs structuraux - Corrosion - Partie 2: Dtermination et classification de la corrosion dun substrat en laiton Strukturklebstoffe - Korrosion - Teil 2: Bestimmung und Klassifikation der Korrosion eines Mes

6、singmaterials This European Standard was approved by CEN on 10 March 2011. 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 without any alteration. Up-to-date lists and bibliog

7、raphical 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 other language made by translation under the responsib

8、ility 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 Republic, Denmark, Estonia, Finland, France, Germany, Greece

9、, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management

10、 Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1965-2:2011: EBS EN 1965-2:2011EN 1965-2:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .4

11、4 Principle 45 Products, materials and apparatus 45.1 Solvent 45.2 Brass electrode, consisting of 0,1 mm thick brass, Ms63F45 or Ms63F55 of width 10 mm. .45.3 Etching solution, consisting of 73 % concentrated sulfuric acid (98 %), 26 % concentrated nitric acid (63 %), 0,5 % sodium chloride, 0,5 % ca

12、rbon black. 45.4 Conditioning chamber, capable of maintaining a hot/humid climate in accordance with EN ISO 291. .55.5 Direct current source, (100 5) V, e.g. a battery, or rectifying equipment with a maximum permissable electrodyne alternating current not greater than 1 %. .55.6 Magnifier, with a ma

13、gnification of 2,5 . 55.7 Electrode and clamping, in accordance with Figure 1 56 Preparation of the brass substrate 77 Test specimens 78 Procedure .79 Discolouration/corrosion 810 Test report 8Annex A (normative) Gradings for the appearance of plus pole and minus pole test foils at the surface of co

14、ntact at the test specimen 9Bibliography . 10BS EN 1965-2:2011EN 1965-2:2011 (E) 3 Foreword This document (EN 1965-2:2011) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. This European Standard shall be given the status of a national standa

15、rd, either by publication of an identical text or by endorsement, at the latest by November 2011, and conflicting national standards shall be withdrawn at the latest by November 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights

16、. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1965-2:2001. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does not purport to address all

17、 of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is understood that some of the material permitted in this standard m

18、ay have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard to the extent possible. At the end of the test, the user of the standard should take care to carry out an appropriate disposal of the was

19、tes, according to local regulation. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, German

20、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 1965-2:2011EN 1965-2:2011 (E) 4 1 Scope This European Standard describes a method to determi

21、ne the ability of an adhesive to corrode a brass substrate under the influence of an applied voltage and high humidity. The temperature, humidity, ageing period and applied voltage are chosen to ensure the maximum differentiation between the corrosivity of different adhesives and are not intended to

22、 represent any particular service condition. 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 am

23、endments) applies. EN 923:2005+A1:2008, Adhesives Terms and definitions EN ISO 291, Plastics Standard atmospheres for conditioning and testing (ISO 291:2008) EN ISO 8044:1999, Corrosion of metals and alloys Basic terms and definitions (ISO 8044:1999) ISO 426 (all parts), Wrought copper-zinc alloys C

24、hemical composition and forms of wrought products 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008 and the following apply. 3.1 corrosion destructive attack on metals which can be chemical or electrochemical in nature NOTE The describe

25、d method measures essentially an electrochemical attack. 4 Principle Two brass electrodes are held in contact with a flat sample of the cured adhesive. The assembly is placed in an environment with a relative humidity of 92 % at 42 C and a direct current voltage of 100 V is applied across the electr

26、odes for four days. Following this the brass surface is examined and the extent of the tarnishing and/or corrosion decided on the basis of discolouration. 5 Products, materials and apparatus 5.1 Solvents. Alcohol pure: for example propan-2-ol or ethanol. 5.2 Brass electrode, consisting of 0,1 mm thi

27、ck brass, Ms63F45 or Ms63F55 of width 10 mm. The length of the foil shall be adapted to the test equipment in accordance with ISO 426 (all parts). 5.3 Etching solution, consisting of 73 % concentrated sulfuric acid (98 %), 26 % concentrated nitric acid (63 %), 0,5 % sodium chloride, 0,5 % carbon bla

28、ck. BS EN 1965-2:2011EN 1965-2:2011 (E) 5 5.4 Conditioning chamber, capable of maintaining a hot/humid climate in accordance with EN ISO 291. 5.5 Direct current source (100 5) V, e.g. a battery, or rectifying equipment with a maximum permissable electrodyne alternating current not greater than 1 %.

29、5.6 Magnifier, with a magnification of 2,5 . 5.7 Electrode and clamping, in accordance with Figure 1. This shall be constructed from inert insulating materials which do not cause additional corrosion under the test conditions. The brass test foils shall make contact with the entire test area of the

30、test specimen with a pressure of about 0,1 MPa. BS EN 1965-2:2011EN 1965-2:2011 (E) 6 Key 1 Test specimen 2 Thickness 3 Test foil 4 Electrode 5 Block of insulating material 6 Adjusting screw 7 Pivot 8 Spring 9 Intermediate piece of insulating material 10 Positive electrode 11 Negative electrode Figu

31、re 1 Test equipment for assessing the effect of electrolytic corrosion BS EN 1965-2:2011EN 1965-2:2011 (E) 7 6 Preparation of the brass substrate Degrease strips of the foil, about 200 mm long and without any flash, with acetone solvent. Immediately afterwards immerse in the etching solution (5.3) (

32、maintained at 15 C to 25 C) for 15 s. Rinse the foil under running water to remove the etching solution (5.3). Repeat this procedure as necessary until the brass foil has an even, dull lustre. Immediately afterwards immerse the brass foil in pure alcohol (5.1) dry with blotting paper and cut into pi

33、eces of suitable length. 7 Test specimens The thickness of the test specimens shall correspond to the relevant product thickness. The test surfaces shall be machined and flat and be at right angles to the edges. The material to be tested shall protrude a few tenths of a millimetre beyond the holding

34、 plates. Remove any flash left following machining with a sharp knife. Finally clean the machined test specimens with pure alcohol. NOTE The etching solution should be freshly made and used only once. The roughness of the brass surface has an influence on colouration and can lead to faulty assessmen

35、ts. An even, dull surface reveals more marked colourations than a semi-matt or glossy surface. CAUTION The etching solution is corrosive. A minimum of three test specimens shall be used for each evaluation. 8 Procedure Ensure that the surface of the electrode in contact with the brass test foils is

36、not discoloured. Insert the test specimens and test foils in the test equipment using tweezers. Do not handle them under any circumstances. Preheat the test equipment with test specimens and test foils in position to 42 C to 45 C and place it in the warm humid environment. This is to ensure that con

37、densation on the test specimen is avoided. This is critical as liquid water in contact with the test specimens and foils can form an electrolyte, significantly increasing the rate of electrolytic corrosion. Place the preheated, assembled, test fixture in the warm humid environment and connect to the

38、 direct current source. Continue ageing under these conditions for four days. On completion of the above ageing, remove the test equipment from the humidity chamber and cool it to room temperature. Remove the test foils and examine the face in contact with the test specimen with a magnifier (5.1). E

39、xamine with particular attention the positive pole for signs of the green products of corrosion, red colouration (start of dezincification, see EN ISO 8044:1999 for definition) or tarnishing. Examine the negative pole for signs of discolouration. NOTE With some materials, colourations occur during t

40、hese tests which are not due to electrolytic corrosion and are recognizable as light brown to dark layers (tarnishing). These non-corrosive colourations consist of a uniform covering over the width of the test area on the brass foils and occur both at the positive and negative electrodes and result

41、without the application of direct current. Therefore, it is possible to confirm that these colourations are not caused by electrolysis by placing the test equipment in the humidity cabinet but without applying the direct current. BS EN 1965-2:2011EN 1965-2:2011 (E) 8 9 Discolouration/corrosion This

42、is graded as follows, following the above described examinations: EN 1965-2 Plus pole grade A. toB (see Annex A) Minus pole grade 1 to 4. 10 Test report The test report shall include the following information: a) a reference to this European Standard, i.e. EN 1965-2; b) type and designation of the p

43、roduct tested; c) description of the substrate preparation procedure; d) description of the type and thickness of the substrates; e) conversion/discolouration grade ranking; f) details of any operations not specified in this European Standard together with details of any events likely to have had an

44、 effect on the results. BS EN 1965-2:2011EN 1965-2:2011 (E) 9 Annex A (normative) Gradings for the appearance of plus pole and minus pole test foils at the surface of contact at the test specimen Table A.1 Gradings for the appearance of plus pole and minus pole test foils at the surface of contact a

45、t the test specimens Plus pole test foil Description Figurative for test specimen thickness 4 mm Figurative for test specimen thickness 1,5 mm Grading Non changes * * A Slight tarnishing and marking * * AN Slight red colouration (start of dezincification) * * A/BHeavy red colouration (advanced dezin

46、cification). Green products of corrosion in the form of small specks. (The changes described can also occur jointly.) * * BMinus pole test foil Description Figurative for test specimen thickness 4 mm Figurative for test specimen thickness 1,5 mm Grading Non changes * * 1 Slight colouration, recogniz

47、able as fine dots or lines. * * 1.2 Progressive colouration (brown). * * 1.4 Colouration (black) in the form of isolated small specks, possibly also accompanied by colouration as under 1.4. * * 1.6 Colouration (black) in the form of a greater number of small specks, possibly also accompanied by colo

48、uration as under 1.4. * * 1.8 Mainly colouration (black) in the form of a greater number of small specks, possibly also accompanied by colouration as under 1.4. * * 2 Colouration (black), to all intents connected, over the entire area of contact of the test specimen, possibly also accompanied by lig

49、hter zones (brown). * * 3 Colouration (black), connected and extending considerably beyond the area of contact of the test specimen, possibly also accompanied by lighter zones (brown). * * 4 * The coloured representation on the test foil can be taken from EN 60426, see Bibliography. BS EN 1965-2:2011EN 1965-2:2011 (E) 10 Bibliography 1 EN 60426, Electrical insulating materials Determination of electrolytic corrosion caused by insulating materials Test methods (IEC 6042