Electrodeposited tin coatings on ferrousand copper and copper alloy productsICS 25.220.40Galvanische Überzüge–Zinnüberzüge auf Eisen- und Kupferwerkstoffen{50965SupersedesFebruary 1982 edition.ForewordThis standard has been prepared by Technical Committee Galvanische Überzüge of the NormenausschussMaterialprüfung (Materials Testing Standards Committee), taking into account the specifications ofDINEN1403.AmendmentsThis standard differs from the February 1982 edition in that:a)the ordering information has been amended;b)service condition numbers are no longer specified;c)the standard has been editorially revised.Previous editionsDIN50965: 1962-10, 1982-02.1ScopeThis standard sets out specifications for tin coatings on ferrous and copper-based materials. It specifiestheir minimum thickness and gives information on the surface finish and heat treatment of the base metals.The standard does not cover semi-finished products and fasteners (cf. DINENISO4042). Threaded articlesshall be coated as agreed.NOTE: When using this standard, any relevant safety regulations such as the Technische Regeln für gefähr-liche Arbeitsstoffe und Gefahrstoffe (TRgA and TRGS) (Codes of practice on hazardous substances), theMAK-Liste, the TRK-Liste and the Verordnung zum Schutz vor gefährlichen Stoffen (German Regulationon dangerous substances and materials) shall be observed.2Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.DIN32506-3Testing of solderability–Vertical dipping test for pre-tinned componentsDIN50902Protective coatings on metals–Concepts, application methods and surface preparationDINEN1403Corrosion protection of metals–Electrodeposited coatings–Method of specifying gen-eral requirementsDINENISO2064Metallic and other inorganic coatings–Definitions and conventions concerning themeasurement of thickness (ISO2064:1996)DINENISO4042Fasteners–Electroplated coatings (ISO4042:1999)©No part of this translation may be reproduced without the prior permission of
DIN Deutsches Institut für Normung e.V., Berlin. Beuth Verlag GmbH, 10772Berlin, Germany,
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--`,,,,-`-`,,`,,`,`,,`---Continued on pages 2 and 3.Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.Ref.No.DIN50965:2000-05
English price group05
Sales No.0105
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DIN50965:2000-05
Technische Regeln für gefährliche Arbeitsstoffe und Gefahrstoffe
MAK-Liste: Maximale Arbeitsplatzkonzentrationen und biologische Arbeitsstofftoleranzwerte (List of thresholdvalues for dangerous substances at workplaces and compatibility values), 1989
TRK-Liste (List of guideline values for concentrations of hazardous substance at workplaces)
Verordnung zum Schutz vor gefährlichen Stoffen, as of 15 November 1999, BGBl. (German Federal Law Gazette) I,No. 52, p. 2233 ff.
3Concepts
3.1Electrodeposited coating
Metallic coating produced by cathodic precipitation from an electrolytic solution (cf. DIN50902).
3.2Significant surface
Unless otherwise agreed, significant surface is an area on a product that can be touched with a ball 20 mm indiameter.*)
3.3Minimum local thickness
The smallest local thickness measured on the significant surface of an article (cf. DINENISO2064).
4Designation
The designation system and abbreviations shall conform to DINEN1403.
4.1Flow-melted tin coatings
If coatings are to be flow-melted, the designation shall include an ‘f’, separated by a solidus from the numberindicating the minimum local thickness (cf. subclause 5.3 of DINEN1403).
Designation of a tin coating on steel, with a minimum local thickness of 20µm:
Coating DIN50965–Fe//Sn20
Designation of a tin coating flow-melted on copper, with a minimum local thickness of 4µm:
Coating DIN50965–Cu/Sn4/f
5
Ordering information
Ordering information shall be provided in accordance with clause 4 of DINEN1403, adding the followinginformation if required:
a)the procedure to be followed for testing solderability;b)the procedure to be followed for testing porosity.
6Coating thickness
6.1General
Even if the minimum local thickness is maintained on significant surfaces (cf. tables 1 and 2), the article maynot be corrosion-resistant as a whole. When selecting the significant surface area, bear in mind that the shapeof the article will influence the overall coating thickness.
7Surface finish
7.1Base metal
This standard specifies no requirements for the composition, microstructure or surface finish of base metals.In the case of milled steel, agreement between manufacturer and customer should be sought.
The articles to be coated shall show no material, manufacturing or surface defects which could impair thefunction, corrosion resistance or the appearance of the coating. In the case of milled articles, such defectsinclude fissures, pores, foreign matter inclusions and laminations and in the case of cast articles, sink marks,cold laps, shrinkage cracks and grooves, whirls and sink marks.
*)Translator’s note. In DINENISO2064, ‘significant surface’ is defined as ‘The part of an article covered orto be covered by the coating and for which the coating is essential for serviceability or appearance’.
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DIN50965:2000-05
7.2Coatings
The significant surface of tin-coated articles shall be free from faults which could impair their appearance orresistance to corrosion, such as pores, cracks, roughness, stains and discoloration.
Coatings shall be adherent. Until an appropriate standard is published, testing of adhesion shall be by agree-ment, as shall be the case when the porosity of coating is to be tested.
8Solderability
Testing shall be carried out in accordance with DIN32506-3, disregarding smooth, uncoated edges occurringwhen the specimen sheets are cut.
9Hydrogen embrittlement
Current methods of electrodepositing metal coatings from aqueous solutions do not preclude the followingsteel components becoming susceptible to hydrogen-induced, delayed brittle fracture (known as ‘hydrogenembrittlement’):
–components made from steel with a tensile strength of 1000N/mm² or more;
–components made from steel of a corresponding hardness (e.g. case hardened or nitride steel);
–components made from severely strain-hardened steel of medium strength, which have been shaped orstrain-hardened before electrodeposition.
Hydrogen embrittlement is a particularly relevant factor when there are stress concentrations as a result of thecomponent design or its surface finish, or because of material inhomogeneity.
Hydrogen embrittlement can generally be prevented by selecting a base metal which is particularly suitable forreceiving a corrosion-protective coating and by appropriate surface preparation and subsequent treatment.Heat treatment is not usually carried out because this may lead to reduced solderability.
10Coating systems
Table 1:Tin coatings on ferrous materials
SymbolFe//Sn30Fe//Sn20
Table 2:Tin coatings on copper-based materials
SymbolCu/Sn30Cu/Sn15Cu/Sn8Cu/Sn41)Cu/Sn4/f2)
1)
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--`,,,,-`-`,,`,,`,`,,`---Fe//Sn12Fe//Sn4Fe//Sn4/f1)
1)
The maximum local thickness should be 8µm.Application of a copper, bronze or nickel under-coat is recommended, while maintaining thethickness of the tin coating.
If the base metal is a copper-zinc alloy, a cop-per, bronze or nickel undercoat with a thicknessof 2µm will be required.
2)The maximum local thickness should be 8µm.
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