1、BRITISH STANDARD BS EN 14436:2004 Copper and copper alloys Electrolytically tinned strip The European Standard EN 14436:2004 has the status of a British Standard ICS 77.150.30 BS EN 14436:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 2
2、9 September 2004 BSI 29 September 2004 ISBN 0 580 44518 6 National foreword This British Standard is the official English language version of EN 14436:2004. The UK participation in its preparation was entrusted to Technical Committee NFE/34, Copper and copper alloys, which has the responsibility to:
3、 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 BSI Catalogue under the section entitled “International S
4、tandards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Stan
5、dard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Europe
6、an 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 39 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since pu
7、blication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN14436 August2004 ICS77.150.30 Englishversion CopperandcopperalloysElectrolyticallytinnedstrip CuivreetalliagesdecuivreBandestames lectrolytiquement KupferundKupferlegierungenElektrolytischverzinnte Bnder ThisEuropeanSta
8、ndardwasapprovedbyCENon27May2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplica
9、tiontotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembers
10、arethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTAN
11、DARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN14436:2004:EEN 14436:2004 (E) 2 Contents page Foreword4 0.1 General5 0.2 Types of
12、electrolytic tinning process and types of coatings of tin or tin alloy.5 0.2.1 Process for matt electrolytic coatings.5 0.2.2 Process for bright electrolytic coatings5 0.2.3 Process reflow brightened electrolytic coatings6 1 Scope 6 2 Normative references 6 3 Terms and definitions .7 4 Designations
13、8 4.1 Material of the strip to be tinned 8 4.1.1 General8 4.1.2 Symbol 8 4.1.3 Number .8 4.2 Material for the coating .8 4.3 Material condition of the electrolytically tinned strip 8 4.4 Product .8 5 Ordering information.10 6 Requirements.11 6.1 Composition.11 6.1.1 Strip to be tinned .11 6.1.2 Mate
14、rial for the coating .11 6.1.3 Purity of tin and tin alloy coatings resulting from electrolysis.11 6.1.4 Use of sub-layer.12 6.2 Mechanical properties and grain size of the base material.12 6.3 Dimensions and tolerances 12 6.3.1 Tolerances on thickness.12 6.3.2 Tolerances on widths 12 6.3.3 Thicknes
15、s of coatings and/or sub-layers12 6.3.4 Coating thickness ranges .14 6.3.5 Sub-layer thickness.14 6.4 Edgewise curvature c14 6.5 Properties of the coating 14 6.5.1 Condition 14 6.5.2 Appearance 14 6.5.3 Solderability .14 6.5.4 Adhesion.15 6.5.5 Special requirements 15 7 Sampling.15 7.1 General15 7.2
16、 Analysis of the base material .15 7.3 Tensile, hardness, grain size and technological tests.15 8 Test methods15 8.1 Analysis of the base material .15 8.2 Tensile test of the base material 16 8.3 Hardness test of the base material 16 8.4 Estimation of average grain size of the base material.16 8.5 E
17、dgewise curvature c16 8.6 Solderability .16 8.7 Adhesion.16 EN 14436:2004 (E) 3 8.8 Measurement of coating thickness .16 8.9 Retests16 8.10 Rounding of results.16 9 Declaration of conformity and inspection documentation .17 9.1 Declaration of conformity.17 9.2 Inspection documentation17 10 Marking,
18、packaging and labelling17 Table 1 Composition of copper 17 Table 2 Composition of copper alloys.18 Table 3 Composition of tin and tin alloys20 Table 4 Mechanical properties and grain size of strip before tinning or base material .21 Table 5 Types of tin or tin alloy electrolytic coating according to
19、 application .36 Table 6 Typical applications according to the main sub-layer metal and thickness36 Table 7 Tolerances on thickness for strip before tinning37 Table 8 Tolerances on width for electrolytically tinned strip when sheared.37 Table 9 Edgewise curvature c for electrolytically tinned strip3
20、8 Bibliography39 EN 14436:2004 (E) 4 Foreword This document (EN 14436:2004) has been prepared by Technical Committee CEN/TC 133 “Copper and cop- per alloys”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an
21、identical text or by endorsement, at the latest by February 2005, and conflicting national standards shall be withdrawn at the latest by February 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europ
22、ean Standard: Austria, Belgium, Cyprus, Czech Republic, Den- mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem- bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Within its
23、 programme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 2 “Rolled flat products“ to prepare the following standard: EN 14436, Copper and copper alloys Electrolytically tinned strip. This is one of a series of European Standards for copper and copper alloy rolled flat products. Oth
24、er products are specified as follows: EN 1172, Copper and copper alloys Sheet and strip for building purposes. EN 1652, Copper and copper alloys Plate, sheet, strip and circles for general purposes. EN 1653, Copper and copper alloys Plate, sheet and circles for boilers, pressure vessels and hot wate
25、r storage units. EN 1654, Copper and copper alloys Strip for springs and connectors. EN 1758, Copper and copper alloys Strip for lead frames. EN 13148, Copper and copper alloys Hot-dip tinned strip. EN 13599, Copper and copper alloys Copper plate, sheet and strip for electrical purposes. EN 14436:20
26、04 (E) 5 0 Introduction 0.1 General This document covers the requirements relating to metallic strips coated with tin or an alloy of tin, using a con- tinuously applied electrolytic process. This type of process consists in subjecting the strips to different surface treatment operations in an instal
27、lation through which they travel, starting from an unwinding system and generally finishing on a winding system. Certain surface treatment operations may be chemical or thermal (degreasing, pickling, finishing, etc.), but the tin or tin alloy coating is achieved by cathodic electrolysis. Strips coat
28、ed using this method are generally intended to be cut and fashioned into individual pieces attached to a system of supporting or pre-assembled strips. Tin or tin alloy coatings are mainly intended to protect the base metal against corrosion, to facilitate soldering operations, to improve insertion a
29、nd withdrawal forces of connectors and to reduce contact resistance at elec- trical connections. The tin or tin alloy is most often applied directly to the strip. However, in certain usage conditions (temperature higher than 120 C, for example) the diffusion phenomena can be harmful (for example alt
30、eration of sol- derability). In such cases it is recommended that an appropriate sub-layer be interposed between the base metal and the final coating layer. This sub-layer is itself obtained by electrolysis. The thickness of the coating and/or the sub-layer depends on the intensity of the electrolys
31、is, as well as the conveying speed in the treatment installation and the lengths of baths. Controlling these parameters enables the thickness of the coating and/or the sub-layer to be regulated with a precision in the order of several tenths of a micrometre. This thickness can be measured and regula
32、ted con- tinuously during the production cycle. Appropriate technology can be used, if necessary, to obtain different thicknesses of the coating and/or the sub-layer on each side of the strip and/or partial application of a coating and/or sub-layer. Usually strips are tinned in larger widths and aft
33、erwards slit to narrower width specified by the customer. In this case, the final slit product has untinned edges. 0.2 Types of electrolytic tinning process and types of coatings of tin or tin alloy 0.2.1 Process for matt electrolytic coatings Matt appearance coatings are obtained using baths which
34、do not contain brightening agents. However, all matt coatings baths (except stannate-based baths) contain grain-refining agents or other additives which pro- duce a matt appearance. These products are generally based on organic compounds. 0.2.2 Process for bright electrolytic coatings Bright (reflec
35、tive) appearance coatings are obtained using baths containing one or more appropriate brighten- ing agents (brighteners). These products are generally based on organic compounds. A proportion of this (these) brightener(s) is incorporated into the coating as it is formed. Its presence may prove undes
36、irable with respect to subsequent melting or soldering operations (gas or blister formation on the coating, formation of a heterogeneous structure). It can, on the other hand, be beneficial with respect to fric- tion properties (low-friction contacts). EN 14436:2004 (E) 6 0.2.3 Process reflow bright
37、ened electrolytic coatings Reflow brightened coatings are obtained by heating a matt electrolytic coating above its fusion (melting) point for a few seconds, and then cooling it before contact with any element of the installation (guide element, transport element, etc.). The coatings remain bright a
38、fter cooling. During this operation, the temperature of the strip reaches levels very close to that of the fused coating. Different techniques exist for heating the strip as it is in motion after the coating operation: through-type gas furnace, infra-red, induction heating, oil bath, ohmic effect, s
39、team, etc. In practice, on-strip reflow brightening is not used for coatings of thickness greater than 5 m (risk of running), nor for coatings which are already bright. NOTE Electrolytic tin coatings may be subject to spontaneous growth of metallic whiskers (combined effect of humid- ity and mechani
40、cal stress, for example). This phenomenon is highly undesirable for electrotechnical applications (risk of short-circuit). The risk of it occurring can be reduced by reflow brightening, using tin-lead alloy coatings or inserting an appropriate underlayer. 1 Scope This document specifies: the composi
41、tion and tolerances on dimensions in the thickness range from 0,1 mm up to and including 4 mm of strip of copper and copper alloys to be tinned with tin or a tin-lead alloy or other tin alloys; the composition of the material to be used for the coating; the properties of strip before tinning; the pr
42、operties of the electrolytically tinned strip; the preferred thicknesses (mean values) and thickness ranges of coatings and their eventual sub-layers; the types of coating and sub-layer; the edgewise curvature of electrolytically tinned strip; the sampling procedure; the methods of test to be used f
43、or verification of conformity to the requirements of this standard; the delivery conditions. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer- ences, only the edition cited applies. For undated references, the latest ed
44、ition of the referenced document (including any amendments) applies. EN 1655, Copper and copper alloys Declarations of conformity. EN 1976, Copper and copper alloys Cast unwrought copper products. EN 10002-1, Metallic materials Tensile testing Part 1: Method of testing (at ambient temperature). EN 1
45、0204, Metallic products Types of inspection documents. EN 14436:2004 (E) 7 EN ISO 2624, Copper and copper alloys Estimation of average grain size (ISO 2624:1990). EN ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Review of methods available for
46、testing adhesion (ISO 2819:1980). EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method (ISO 6507-1:1997). ISO 1811-2, Copper and copper alloys Selection and preparation of samples for chemical analysis Part 2: Sampling of wrought products and castings. ISO 2093, Electroplated
47、coatings of tin Specification and test methods. ISO 3497, Metallic coatings Measurement of coating thickness X-ray spectrometric methods. ISO 7587, Electroplated coatings of tin-lead alloys Specification and test methods. IEC 60068-2-20, Environmental testing Part 2: Test T: Soldering. 3 Terms and d
48、efinitions For the purposes of this document, the following terms and definitions apply. 3.1 strip flat rolled product of rectangular cross-section with uniform thickness manufactured in coils and supplied in as sheared coils or traverse wound coils, usually with slit edges. The thickness does not exceed one tenth of the width 3.2 electrolytically tinned strip strip which is tinned with coatings on each face of equal thickness by drawing in an appropriate manner through an electrolytic bath 3.3 differe
