AS 4169-1994

1 - AS 4169:1994 ELECTROPLATED COATINGS - TIN AND TIN ALLOYS
4 - PREFACE
5 - CONTENTS
7 - 0 Introduction
7 - 1 Scope and field of application
7 - 2 References
7 - 3 Definitions
8 - 4 Information to be supplied by the purchaser to the electroplater
8 - 4.1 Essential information
8 - 4.2 Additi onal information
8 - 5 Basis material
8 - 6 Sampling
8 - 7.1 Service condition number
8 - 7.2 Coating classification code
8 - 8 Heat treatment of steel
8 - 8.1 Stress relief before electroplating
9 - 8.2 Hydrogen embrittlement relief after electroplating
9 - 9 Requirements for undercoats
9 - 10 Requirements for coatings
9 - 10.1 Appearance
9 - 10.2 Thickness
10 - 10.3 Adhesion
10 - 10.4 Porosity
10 - 10.5 Solderabilit y
10 - 10.5.1 General materials and piece parts
10 - 10.5.2 Printed circuit boards
11 - Annex A - Determination of coating thickness
11 - A.0 Introductory notes
11 - A.0.1 Routine methods
11 - A.0.2 Referee methods
11 - A.1 Measurement of local thickness
11 - A.1.1 Microscopical method
11 - A.1.2 Coulometric method
11 - A.1.3 Beta backscatter method
11 - A.1.4 X-ray spectrometric method
11 - A.2 Measurement of average thickness
11 - A.2.1 Principle
11 - A.2.2 Reagents
12 - A.2.3 Test specimen
12 - A.2.4 Procedure
12 - Annex B - Adhesion tests
12 - B.1 Burnishing test
12 - B.2 Bend test
12 - B.3 Thermal shock test
13 - Annex C - Guidance notes
13 - C.1 Properties of the coating
13 - C.1.1 General
13 - C.1.2 Whisker growth
13 - C.1.3 Allotropic changes
13 - C.2 Properties and preparation of the basis material
13 - C.2.1 Surface condition
13 - C.2.2 Formation of intermetallic compounds
13 - C.2.3 Diffusion of zinc
13 - C.2.4 “Difficult” basis materials
14 - C.2.5 Aluminium, magnesiumand zinc alloys
14 - C.3 Electroplating practice
14 - C.3.1 Post-electroplating rinse
14 - C.3.2 Coating thickness requirements
14 - C.3.3 Co-deposition of organic matter
14 - C.4 Flow-melting
14 - C.5 Tin coatings in contact with food
14 - C.5.1 Organic brighteners
14 - C.5.2 Tin content

Specifies requirements for electroplated coatings of tin on fabricated metal articles to protect them from corrosion and to facilitate soldering. Appendices contain test methods and give advice on the properties of tin coatings and electroplating practice. This Standard is technically identical with, and has been reproduced from, ISO 2093:1986.

This International Standard specifies requirements for electroplated coatings of nominally pure tin on fabricated metal articles. The coatings may be dull or bright as electroplated or may be flow-melted by fusion after electroplating.It does not apply to a) threaded components; b) tin-coated copper wire;c) coatings on sheet, strip or wire in unfabricated form, or on articles made from them;d) coatings on coil springs;e) coatings applied by chemical means (immersion, autocatalytic or "electroless");f) electroplating of steels with tensile strength greater than 1 000 MPa1)(or of corresponding hardness), because such steels are subject to hydrogen embrittlement (see 8.2).

First published as AS K141-1966 (endorsement of BS 1872:1964 with amendment).
Revised and redesignated AS 4169-1994.