ASTM B545-97(2004)e1

    Standard Specification for Electrodeposited Coatings of Tin

    SUPERSEDED (see Active link, below)


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    1. Scope

    1.1 This specification covers the requirements for electrodeposited (electroplated) coatings of tin applied to metallic articles. Tin coatings are used to provide a low contact-resistance surface, to protect against corrosion (see ), to facilitate soldering, to provide anti-galling properties, and to be a stopoff coating in the nitriding of high-strength steels.

    1.2 Some corrosion can be expected from tin coatings exposed outdoors. In normal indoor exposure, tin is protective on iron, steel, nickel, copper, and their alloys. Corrosion can be expected at discontinuities in the coating (such as pores) due to galvanic couples formed between the tin and the underlying metal through the discontinuities, especially in humid atmospheres. Porosity increases as the coating thickness decreases, so that minimum thicknesses must be specified for each application. Parts coated with tin can be assembled safely in contact with iron and steel, tin-coated aluminum, yellow chromated zinc, cadmium, and solder coatings. (See for oxidation and corrosion properties.)

    1.3 This specification applies to electroplated coatings of not less than 99 % tin (except where deliberately alloyed for special purposes, as stated in ) obtained from any of the available tin electroplating processes (see ).

    1.4 This specification does not apply to hot-dipped tin or other non-electrodeposited coating; it also does not apply to mill products. For mill products, refer to Specifications A 623 or A 623M.

    1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    1.6This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A623 Specification for Tin Mill Products, General Requirements

    A623M Specification for Tin Mill Products, General Requirements [Metric]

    B32 Specification for Solder Metal

    B183 Practice for Preparation of Low-Carbon Steel for Electroplating

    B242 Guide for Preparation of High-Carbon Steel for Electroplating

    B246 Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes

    B281 Practice for Preparation of Copper and Copper-Base Alloys for Electroplating and Conversion Coatings

    B320 Practice for Preparation of Iron Castings for Electroplating

    B322 Guide for Cleaning Metals Prior to Electroplating

    B374 Terminology Relating to Electroplating

    B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section

    B499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals

    B504 Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method

    B507 Practice for Design of Articles to Be Electroplated on Racks

    B542 Terminology Relating to Electrical Contacts and Their Use

    B558 Practice for Preparation of Nickel Alloys for Electroplating

    B567 Test Method for Measurement of Coating Thickness by the Beta Backscatter Method

    B568 Test Method for Measurement of Coating Thickness by X-Ray Spectrometry

    B571 Practice for Qualitative Adhesion Testing of Metallic Coatings

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

    B659 Guide for Measuring Thickness of Metallic and Inorganic Coatings

    B678 Test Method for Solderability of Metallic-Coated Products

    B697 Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings

    B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings

    B765 Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings

    B809 Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor (Flowers-of-Sulfur)

    B849 Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement

    B850 Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement

    B851 Specification for Automated Controlled Shot Peening of Metallic Articles Prior to Nickel, Autocatalytic Nickel, or Chromium Plating, or as Final Finish

    D3951 Practice for Commercial Packaging


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 73181100(Coating services)


    DOI: 10.1520/B0545-97R04E01

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