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Gold base alloy chemical composition analytical method

A technology of chemical composition and gold-based alloys, applied in the field of chemical analysis, can solve the problems of difficult and inability to dissolve gold-based alloys completely, and achieve the effect of eliminating substandard materials and improving product quality.

Active Publication Date: 2010-09-29
NANJING CHENGUANG GRP
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Problems solved by technology

[0003] The purpose of the present invention is to invent a method for analyzing the chemical composition of gold-based alloys, aiming at the problem that the chemical dissolution method is used to detect gold-based alloys because the dissolution is difficult to complete and cannot be carried out.

Method used

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with embodiment.

[0015] Enhancing the ratio of hydrochloric acid: nitric acid to make it greater than the traditional 3:1 ratio is the key measure to realize the complete dissolution of silver chloride and prevent precipitation, which is conducive to the complete dissolution and overcomes the problem of silver chloride covering the test area in the traditional proportioning. The sample surface prevents the depth of dissolution from proceeding.

[0016] Secondly, the speed of dissolution is promoted by slow heating.

[0017] The present invention will be further described below by taking a specific gold-based alloy as an example.

[0018] A kind of AuAgNiCu22-3-1 gold base alloy chemical composition analysis method, it comprises following work process:

[0019] 1. Decomposition of the sample

[0020] Weigh 0.1000g sample, accurate to 0.0001g. Place the sample in a 250ml beaker, add 40ml of 4-5:1 (...

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Abstract

The invention discloses a method to dissolve the gold alloy using the mixing acid of HCl and HNO3 as solvent and by adjusting temperature and adding the oxidant to analyze the chemical component precisely. It uses the AuAgNiCu22-3-1 alloy as example to descript the theory and test structure. It decomposes the AgCl by the ammonia directly and determines the component of Ag, Ni and Cu elements in AuAgNiCu22-3-1 alloy solution by the air-acetylene lean fuel flame atomic absorption spectrum, also after the multilevel and multifactor orthogonal test, it gets the proportion of HCl and HNO3 is 4:1. The error of the analysis method is smaller than 2%, the recovery rate is more than 95.0%; so it is an economic and quick detection method.

Description

technical field [0001] The invention relates to a chemical analysis method, in particular to a method for analyzing the chemical composition of insoluble materials, in particular to a method for analyzing the chemical composition of gold-based alloys. Background technique [0002] Gold-based alloy (such as AuAgNiCu22-3-1) material is an important metal material, which is widely used in the manufacture of high-precision servo mechanisms. In order to ensure product quality, its chemical composition must be strictly controlled. For users who use this material, since there is no high-precision analytical equipment (such as emission spectroscopy, nuclear magnetic resonance equipment) to analyze its chemical composition, the most commonly used chemical composition is chemical composition analysis for its main chemical composition such as gold, silver, nickel, and copper Analytical method, but the biggest problem encountered is how to make it dissolve, and then carry out correspond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/38G01N1/44G01N31/00
Inventor 彭维勉乐李陈益媚郝刚
Owner NANJING CHENGUANG GRP
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