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1、BRITISH STANDARD BS EN 1965-2:2001 Structural adhesives Corrosion Part 2: Determination and classification of corrosion to a brass substrate The European Standard EN 1965-2:2001 has the status of a British Standard ICS 77.060; 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT
2、 LAW Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 1965-2:2001 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Co
3、mmittee and comes into effect on 15 June 2001 BSI 06-2001 ISBN 0 580 37410 6 National foreword This British Standard is the official English language version of EN 1965-2:2001. It supersedes DD ENV 1965-2:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Com
4、mittee PRI/52, Adhesives, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the
5、 BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are res
6、ponsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK inte
7、rests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright date displayed in this document indicates when the
8、 document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1965-2 April 2001 ICS 77.060; 83.180Supersedes ENV 1965
9、-2:1995 English version Structural adhesives - 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
10、und Klassifikation der Korrosion eines Messingmaterials This European Standard was approved by CEN on 19 February 2001. 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
11、 any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the 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 b
12、y translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Irel
13、and, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any
14、form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1965-2:2001 E Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1965-2:2001 Contents Page Foreword3 1Scope4 2Normative references4 3Terms and definitions
15、.4 4Principle4 5Products, materials and apparatus4 6Preparation of the brass substrate6 7Test specimens7 8Procedure.7 9Discolouration/corrosion7 10Test report8 Annex A (normative) Gradings for the appearance of plus pole and minus pole test foils at the surface of contact at the test specimen .9 Lic
16、ensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1965-2:2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 193 “Adhesives“, the secretariat of which is held by AENOR. This European Standard shall be gi
17、ven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2001, and conflicting national standards shall be withdrawn at the latest by October 2001. This European Standard supersedes ENV 1965-2:1995. Annex A is normative. According
18、to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spa
19、in, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1965-2:2001 1 Scope This part of the present European standard describes a method to determine the ability of an adhesive to corrode a
20、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 represent any particular service condition
21、. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revi
22、sions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 923Adhesives - Terms and definitions ISO 291Plastics - Standard atmosp
23、heres for conditioning and testing ISO 426Wrought copper-zinc alloys - Chemical composition and forms of wrought products. ISO 8044Corrosion of metals and alloys Basic terms and definitions. IEC 60426Test methods for determining electrolytic corrosion with insulating materials. 3 Terms and definitio
24、ns For the purposes of this European standard, the terms and definitions given in EN 923 and the following terms and definitions apply: 3.1 corrosion destructive attack on metals which can be chemical or electrochemical in nature NOTEThe described method measures essentially an electrochemical attac
25、k. 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 electrodes for four days. Following this the brass surface i
26、s examined and the extent of the tarnishing and/or corrosion decided on the basis of discolouration. 5 Products, materials and apparatus 5.1 Solvent Alcohol pure: for example propan-2-ol or ethanol. 5.2 Brass electrode Consisting of 0,1 mm thick brass, Ms63F45 or Ms63F55 of width 10 mm. The length o
27、f the foil shall be adapted to the test equipment in accordance with ISO 426. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1965-2:2001 5.3 Etching solution Consisting of 73 % sulfuric acid, 25 % nitric acid, 0,5 % sodium chlorid
28、e, 0,5 % lustrous carbon black. 5.4 Conditioning chamber Capable of maintaining a hot/humid climate in accordance with 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 %. 5.6 Magnifier
29、With a magnification of 2,5 X. 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 test specimen
30、with a pressure of about 0,1 MPa. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 1965-2:2001 Key 1test specimen 2thickness 3test foil 4electrode 5block of insulating material 6adjusting screw 7pivot 8spring 9intermediate piece of
31、insulating material 10 positive electrode 11 negative electrode Figure 1 Test equipment for assessing the effect of electrolytic corrosion 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 i
32、n the etching solution (5.3) (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
33、blotting paper and cut into pieces of suitable length. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 7 EN 1965-2:2001 7 Test specimens The thickness of the test specimens shall correspond to the relevant product thickness. The test su
34、rfaces 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 plates. Remove any flash left following machining with a sharp knife. Finally clean the machined test specimens with pure alcohol. NOTEThe e
35、tching solution should be freshly made and used only once. The roughness of the brass surface has an influence on colouration and can be lead to faulty assessments. An even, dull surface reveals more marked colourations than a semi-matt or glossy surface. CAUTIONThe etching solution is corrosive. A
36、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 not discoloured. Insert the test specimens and test foils in the test equipment using tweezers. Do not handle them under any circumstances.
37、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 condensation on the test specimen is avoided. This is critical as liquid water in contact with the test specimens and foils can form an electro
38、lyte, significantly increasing the rate of electrolytic corrosion. Place the preheated, assembled, test fixture in the warm humid environment and connect to the direct current source. Continue ageing under these conditions for four days. On completion of the above ageing, remove the test equipment f
39、rom 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 magnifying glass. Examine with particular attention the positive pole for signs of the green products of corrosion, red colouration (start of dezincification,
40、 see ISO 8044 for definition) or tarnishing. Examine the negative pole for signs of discolouration. NOTEWith some materials, colourations occur during these tests which are not due to electrolytic corrosion and are recognizable as light brown to dark layers (tarnishing). These non-corrosive colourat
41、ions 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 without the application of direct current. Therefore, it is possible to confirm that these colouration are not caused by electrolysis by placing the
42、 test equipment in the humidity cabinet but without applying the direct current. 9 Discolouration/corrosion This 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. Licensed Copy: sheffieldun sheffieldun, na, Sun
43、Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 8 EN 1965-2:2001 10 Test report The test report shall include the following information : 1 a reference to this part of European standard ; 2 type and designation of the product tested ; 3 description of the substrate preparation proced
44、ure ; 4 description of the type and thickness of the substrates ; 5 conversion/discolouration grade ranking ; 6 details of any operations not specified in this part of the European standard together with details of any events likely to have had an effect on the results. Licensed Copy: sheffieldun sh
45、effieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 9 EN 1965-2:2001 Annex A (normative) Gradings for the appearance of plus pole and minus pole test foils at the surface of contact at the test specimen Plus pole test foil DescriptionFigurative for test specimen thickn
46、ess 4 Figurative for test specimen thickness 1,5 Grading Non changes*A Slight tarnishing and marking*AN Slight red colouration (start of dezincification) *A/B Heavy red colouration (advanced dezincification). Green products of corrosion in the form of small specks. (The changes described can also oc
47、cur jointly) *B Minus pole test foil DescriptionFigurative for test specimen thickness 4 Figurative for test specimen thickness 1,5 Grading Non changes*1 Slight colouration, recognizable as fine dots or lines *1.2 Progressive colouration (brown) *1.4 Colouration (black) in the form of isolated small
48、 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 colouration as under 1,4 *1.8 Mainly colouration (black) in the form of a greater number of small specks, possibly also accompanied by
49、 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 lighter 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 IEC 60426. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 1965-2:2001 BSI 389
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