基于金银合粒组织结构和性能的金量测定影响探讨
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摘要
利用X射线衍射仪、差示扫描量热仪、电化学工作站、显微硬度计对火试金法中金银合粒的组织结构、耐腐蚀性、力学性能进行了研究。结果表明:银、金质量比分别为2. 1,2. 3和2. 5时金银合粒的分子式为Ag_(79)Au_(21)、Ag_(81)Au_(19)和Ag_(82)Au_(18),均为银基固溶体,其熔化开始温度和凝固结束温度相近,耐腐蚀性和力学性能相似。采用火试金法测定金合金首饰中金量时,银、金质量比为2. 1～2. 5对测定结果没有影响。
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 Ag_(79)Au_(21),Ag_(81)Au_(19)and Ag_(82)Au_(18) 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.
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 Ag_(79)Au_(21),Ag_(81)Au_(19)and Ag_(82)Au_(18) 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.
引文
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[2]刘海彬,刘雪松,李婷,等.火试金法测定首饰中金含量影响因素分析[J].黄金,2017,38(10):84-86.
[3]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.金合金首饰金含量的测定灰吹法(火试金法):GB/T 9288—2006[S].北京:中国标准出版社,2006.
[4]李嘉伟,温涌波,于盼成,等.火试金法中银作用的探讨[J].现代测量与实验室管理,2014(6):14-17.
[5]李素青,李玉鹍.火试金法测定白色K金合金首饰的含金量[J].宝石和宝石学杂志,2008,10(3):23-26.
[6]神克常.取向性及合金化对Au及其合金的结构与性能影响的研究[D].济南:山东大学,2017.
[7]许晓文,杨万龙,李一峻,等.定量化学分析[M]. 2版.天津:南开大学出版社,2006:414.
[8]宁远涛.合金元素对Au的强化效应与应用[J].贵金属,2002,23(3):51-56.
[9]李桂华,何文军,王义善,等.镍元素对18K金固溶强化的影响[J].黄金,2016,37(5):6-9.