1.1 Subject content
This Specification specifies all requirements of electrodeposited silver coating.
1.2 Scope of application
This Specification is applicable to the electrodeposited silver coating of metallic and nonmetallic workpieces for electronic and electric product.
1.3 Classification
1.3.1 Type
Silver coating can be divided into the following three types as required (see 3.3.4 and 6.3):
Type I — No brightness
Type II — Half brightness
Type III — Brightness
1.3.2 Grade
Silver coating can be divided into the following two grades as required (see 3.4.7 and 6.1.2):
Grade A — With reinforced anti-discoloration treatment (chromate treatment)
Grade B — Without reinforced anti-discoloration treatment
2 Normative References
GB 1031-83 Surface Roughness Parameters and Their values
GB 3131-88 Tin-lead Solder
GB 4677.8-84 Test Methods of Plating and Coating Thickness by Beta Backscattering for Printed Boards
GB 4955-85 Measurement of Coating Thickness — Coulometric Method by Anodic Dissolution
GB 4956-85 Non-magnetic Coatings on Magnetic Substrates — Measurement of Coating Thickness — Magnetic Method
GB 6462-86 Metallic and Oxide Coatings — Measurement of Coating Thickness — Microscopical Method
GB 9491-88 Liquid Flux for Soldering (Rosin Base)
GB 9790-88 Metallic and Related Coatings — Vickers and Knoop Microhardness Tests
GB 11378-90 Metallic Coatings — Measurement of Coating Thickness — Profilometric Method
GB 12307.1-90 Metallic Coatings — Test Methods for Electrodeposited Silver and Silver Alloy Coatings — Part 1: Determination of Coating Thickness
GB/T 13911-92 Expression Methods for Metallic Coating and Chemical Treatment
GJB 179-86 Sampling Procedures and Tables for Inspection by Attributes
SJ 20147.1-92 Measurement Methods for Electrodeposited Silver and Silver Alloy Coating Thickness — Method by the X-ray Fluorescent Spectromentry
SJ 20147.2-92 Determination Methods for Electrodeposited Silver and Silver Alloy Coatings — Determination of the Presencl of Residual Salts
3 Requirements
3.1 Materials
Used materials shall be able to produce electrodeposited silver coating in conformity with the requirements of this Specification.
3.2 Coating quality
