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