1 Scope
This part of QB/T 1901 specifies methods to determine fineness, thickness, corrosion resistance and adhesion for gold alloy coverings on watch-cases and accessories, including bracelets when they are permanently attached to the case.
The tests apply only to significant surfaces.
This part of QB/T 1901 applies to all gold alloy coverings specified in QB/T 1901.1.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB/T 6462 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method (eqv ISO 1463: 1982)
GB/T 4955 Metallic coatings - Measurement of coating thickness - Coulometric method by anodic dissolution ( ISO 2177: 1985, IDT)
QB/T 1901.1 Watch-cases and accessories - Gold alloy coverings - Part 1: General requirement (ISO 3160-1:2006, IDT)
GB/T 16921 Measurement of metallic coating thickness - X-ray spectrometric methods (eqv ISO 3497: 1990)
QB/T 3819 Thickness measurement method of the metallic coatings and conversion coatings for the light industrial products - β-Ray backscatter method (ISO 3543: 1981, IDT)
ISO 3868 Metallic and other non-organic coatings - Measurement of coating thicknesses - Fizeau multiple-beam interferometry method
ISO 4524-1 Metallic coatings - Test methods for electrodeposited gold and gold alloy coatings - Part 1: Determination of coating thickness
ISO 4524-5 Metallic coatings - Test methods for electrodeposited gold and gold alloy coatings - Part 5: Adhesion tests
QB/T 3831 Color change and corrosion resistance test method of Metallic coatings and conversion coatings - hydrogen sulfide test method (neq ISO 4538: 1978)
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests (eqv ISO 9227: 1990)
GB/T 9288 Gold jewellery alloys - Determination of gold - Cupellation method (fire assay) (neq ISO 11426: 1993)
GB/T 18043 Precious metal jewellery content non-damaged test method - X-ray fluorescence spectrometry
GB/T 18179 Metallic coatings - Porosity tests - Humid sulfur (flowers of sulfur) (ISO 12687: 1996, IDT)
GB/T 19351 Metallic coatings - Determination of porpsity in gold coatings on metal substrates - Nitric acid vapour test (ISO 14647: 2000, IDT)
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Determination of fineness
6 Determination of contents
7 Determination of thickness
8 Determination of the corrosion resistance
9 Adhesion test
Annex A (Normative) Method of separating the gold alloy covering
Annex B (Normative) Description of the main tests for determination of the thickness of gold alloy coverings
Bibliography
