EN ISO 4521:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Information to be supplied by the
  purchaser to the electroplater
  4.1 Essential information
  4.2 Additional information
5 Designation
  5.1 General
  5.2 Designation specifications
  5.3 Designation of the basis material
  5.4 Designation of heat treatment requirements
  5.5 Examples of designations
6 Requirements
  6.1 General
  6.2 Appearance
  6.3 Thickness
  6.4 Porosity
  6.5 Accelerated corrosion testing
  6.6 Composition
  6.7 Stress-relief heat treatment prior to
       electroplating
  6.8 Hydrogen-embrittlement-relief heat
       treatment after electroplating
  6.9 Adhesion
  6.10 Electrical properties
  6.11 Microhardness
  6.12 Solderability
  6.13 Wear resistance
  6.14 Ductility
  6.15 Undercoats
  6.16 Freedom from contamination
  6.17 Anti-tarnish treatments
7 Sampling
Annex A (normative) - Requirements for undercoats
Annex B (normative) - Methods of measuring the thickness of
                      electroplated silver and silver alloy
                      coatings
Annex C (normative) - Adhesion tests
Annex D (normative) - Determination of the presence of
                      residual salts
Bibliography

ISO 4521:2008 specifies requirements for electroplated silver and silver alloy coatings for electrical, electronic and other engineering applications, including test methods. Engineering applications are defined as those in which the coating essentially serves a non-decorative purpose.Although ISO 4521:2008 does not specify the condition, finish or surface roughness of the basis material prior to electroplating, the appearance and serviceability of electroplated silver and silver alloy coatings depends on the condition of the basis material. It is essential that the purchaser specifies the surface finish and roughness of the basis material in order to conform to the product requirements.ISO 4521:2008 does not apply to coatings on screw threads or to coatings on sheet, strip or wire in the non-fabricated form.