Method for measuring thickness of gold foil product

A measurement method, gold foil technology, applied in the field of precious metal measurement, can solve the problem of lack of measurement methods

Pending Publication Date: 2020-05-01
NANJING INST OF PROD QUALITY INSPECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the majority of gold foil manufacturers and consumers in the market are more concerned about the thickness of the gold foil product rather than the thickness of the pure gold layer of gold foil. The control of the thickness of the product by the majority of gold foil manufacturers is also based on experience and lacks precise measurement methods.

Method used

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  • Method for measuring thickness of gold foil product
  • Method for measuring thickness of gold foil product
  • Method for measuring thickness of gold foil product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 10 July 4th gold foil samples from a certain manufacturer, use a precision balance to weigh the mass G to be 0.2137g, use a vernier caliper to measure the length and width of the gold foil, and the average length L of the 10 gold foil samples 1 109.5mm, average width L 2 It is 109.5mm.

[0018] According to the measurement methods of QB / T 1734 and GB / T 21198.6, the composition of the gold foil sample is determined, and the specific steps are as follows:

[0019] (1) The X-ray fluorescence energy spectrometer will be used to analyze and detect the composition of the gold foil sample folded into a square, so as to obtain the approximate mass fraction of the main elements (gold, silver, copper, iron) in the gold foil sample;

[0020] (2) According to the quality of the gold foil to be tested and the approximate mass fraction of the main impurity elements (silver, copper, iron) measured above, use national certified standard materials to prepare silver, copper, and ir...

Embodiment 2

[0044] Adopt the same gold foil product as in Example 1, also use a vernier caliper to measure the length and width of the gold foil, and obtain the pure gold layer density ρ of the gold foil product according to the existing QB / T1133 method 金 , using the chemical method to measure the mass M of pure gold in these 10 gold foil products is 0.1664g, according to its calculation formula

[0045]

[0046] L 3 - the average length of gold foil (mm)

[0047] L 4 — average width of gold foil (mm)

[0048] ρ 金 —Comprehensive density of gold foil products (g / cm 3 )

[0049] M—the weight of pure gold in 10 gold foil products (g)

[0050] h 2 — Thickness of pure gold layer (μm)

Embodiment 3

[0052] Using the same gold foil product as in Example 1, according to the QB / T 1135 method, by adopting an X-ray fluorescence energy spectrometer to measure the characteristic spectral line intensity of the gold element, and then according to a calibration curve fitted by a series of standard samples, finally measure The thickness of the gold foil obtained is 0.064 μm.

[0053] It can be seen that the two methods of QB / T 1135 and QB / T 1133 measure the thickness of the pure gold layer of gold foil products, so the final results are relatively close, but they are far from the actual thickness of gold foil products. The QB / T 1734-2008 "Gold Foil" product standard clearly stipulates that the average thickness of gold foil products is 0.11±0.02μm, which is not the specified thickness of pure gold layer. Consumers and manufacturers are more concerned about the average thickness of the product. Therefore, the method adopted in the present invention is more accurate and more in line w...

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Abstract

The present invention discloses a method for measuring the thickness of a gold foil product. The gold foil product is subjected to component measurement according to a measurement method of QB / T1734 and GB / T 21198.6 by adopting an inductive coupling plasma emission spectrometer, and according to the percentage content and density of constituent elements, the comprehensive density of gold foil is calculated out. A vernier caliper is used for accurately measuring the length and width of the gold foil at the same time, a precision balance is used for weighing the mass of the gold foil, and finally the exact thickness of the gold foil product is calculated out according to the mass, length, width and comprehensive density of the gold foil.

Description

technical field [0001] The invention relates to the field of precious metal measurement, and specifically relates to a method for measuring the thickness of a gold foil product. Background technique [0002] The biggest feature of gold leaf is that it is as thin as a cicada's wing, so the thickness of gold leaf is an important technical indicator of this product, but the thickness of gold leaf products is generally about 0.1 micron, and it is difficult to directly measure its thickness. QB / T 1734-2008 "Gold foil" product standard refers to QB / T 1135 "Determination of gold and silver coating thickness of jewelry by X-ray fluorescence spectrometry" and QB / T 1133 "Gold coating thickness of jewelry". There are two methods for the determination of chemical method. Among them, QB / T 1135 uses X-ray fluorescence energy spectrometer to measure the characteristic line intensity of gold element, and then calculates the thickness of gold foil according to the calibration curve fitted b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/08
CPCG01B21/08
Inventor 王鑫磊黄成张帆王亮
Owner NANJING INST OF PROD QUALITY INSPECTION
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