ASTM-B545 2004

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B545-97(2004)e1 Standard Specification for Electrodeposited Coatings of Tin

Published By	Publication Date	Number of Pages
ASTM	2004	8

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Categories: 25.220.40 - Metallic coatings, ASTM

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Description

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.

1.6 This 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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Classification
3	Ordering Information Coating Requirements Sampling
4	Test Methods Rejection and Rehearing Keywords
5	X1. DETERMINATION OF MEAN COATING THICKNESS OF SMALL ARTICLES BY THE WEIGHT LOSS METHOD X1.1 X1.2 X1.3 X1.4 X2. ADHESION TESTS X2.1 X2.2 X2.3 X2.4
6	X3. SOLDERABILITY TESTS X3.1 X3.2 X3.3 X4. SOME DEFINITIONS OF WETTING TERMINOLOGY X4.1 X4.2 X4.3 X5. SULFUR DIOXIDE POROSITY TEST (STEEL SUBSTRATES) X5.1 X5.2
7	X5.3 X5.4 X5.5 X6. DESIGN CONSIDERATIONS X6.1 X6.2 X6.3
8	REFERENCES

Additional information

Standard Title	B545-97(2004)e1 Standard Specification for Electrodeposited Coatings of Tin
Published Code	ASTM
Publication Date	2004
Pages Count	8
ICS Codes	25.220.40 - Metallic coatings

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