Precious metal alloy coatings jewellery - General technical requirements of plating
1 Scope
This standard specifies the terms, definition, types, requirements and test methods of plating for precious metal alloy (e.g. gold, silver and rhodium) coatings jewellery.
This standard is applicable to the palting of precious metal (gold, silver, rhodium, etc.) coatings jewellery made of tin alloy, zinc alloy, aluminum alloy, copper alloy and other metals as base materials.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 5270 Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion (ISO 2819: 1980, IDT)
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227: 1990, EQV)
GB 11887 Jewellery - Fineness of precious metal alloys and designation (ISO 9202: 1991, MOD)
GB/T 16921 Metallic coatings - Measurement of coating thickness - X-ray spectrometric method (ISO 3497: 2000, IDT)
QB/T 1135 Jewelery - Measurement of gold and silver coating thickness - X-ray fluorescence spectrometric methods
QB/T 3831 Color change and corrosion resistance test method of metallic coatings and conversion coatings - hydrogen sulfide test method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
blistering
the surface of the plating layer is blistered, which is separated from the base metal or adjacent plating layer but not falling off yet.
3.2
peeling
a plating layer is separated from the base metal or adjacent plating layer.
