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2019
Discussion of the effect on gold content detection based on structure and properties of gold-silver alloys
- English Author：
- National Gold & Diamond Testing Center&Shandong Provincial Key Laboratory of Metrology and Measurement,Shandong Institute of Metrology|National Gold & Diamond Testing Center&Shandong Provincial Key Laboratory of Metrology and Measurement,Shandong Institute of Metrology|Shandong Provincial Key Laboratory of Metrology and Measurement,Shandong Institute of Metrology|National Gold & Diamond Testing Center|National Gold & Diamond Testing Center&Shandong Provincial Key Laboratory of Metrology and Measurement,Shandong Institute of Metrology|National Gold & Diamond Testing Center&Shandong Provincial Key Laboratory of Metrology and Measurement,Shandong Institute of Metrology
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Abstract:
The structure,corrosion resistance and mechanical properties of gold-silver alloys were studied by X-ray diffractometer,differential scanning calorimetry,electrochemical workstation and microhardness tester.The results show that the Ag79Au21,Ag81Au19 and Ag82Au18 alloys are all silver-based solid solution,corresponding to the mass ratio of silver to gold 2.1,2.3,2.5.The initial melting temperature and the final solidification temperature of the three alloys are similar.In addition,the three alloys display similar corrosion resistance and mechanical properties.Therefore,the silver-gold mass ratio(between 2.1 and 2.5) has no effect on the test results when the gold jewelry is tested by fire assay.
Keywords:
fire assay;gold-silver alloys;structure;corrosion resistance;mechanical property
