Analyzing method for lead content in tin-lead alloy

A technology of tin-lead alloy and analysis method, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as the lack of a unified, efficient and fast detection method, etc., To achieve the effect of simple operation, fast analysis speed and high analysis accuracy

Inactive Publication Date: 2013-04-17
SHANGHAI FALAB TEST
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Problems solved by technology

At present, the main test methods for lead content in tin-lead alloys are the national standard: GB 3260.4-2000 "Tin Chemical Analysis Method for Determination of Lead by Oscillograph", the test range is: 0.00020% ~ 0.015%, which belongs to the test of trace amounts of lead. There is no unified, efficient and rapid detection method for the detection of lead content in tin-lead alloys with a lead content of more than 10%

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Embodiment Construction

[0017] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0018] A kind of analysis method of lead content in tin-lead alloy, this method comprises the following steps:

[0019] A. Weigh 0.2500g of tin-lead alloy into a beaker, add 15mL of nitric acid solution (1+1), dissolve at low temperature and concentrate to about 5mL;

[0020] B. Add 30mL of boiling water and 1g of ammonium nitrate to the beaker, stir to dissolve and let stand for 30min;

[0021] C. Filter the solution obtained in the previous step with a slow filter paper added with a little pulp, and wash the beaker several times with hot nitric acid solution (1+100);

[0022] D, the filtrate obtained in the previous step is moved to a 250mL volumetric flask to constant volume and ...

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Abstract

The invention provides an analyzing method for lead content in tin-lead alloy. The method comprises the following steps: A, weighing a tin-lead alloy sample m and placing the sample in a beaker, and adding a dilute nitric acid solution to dissolve and condense the sample at low temperature; B, adding boiled water and ammonium nitrate into the beaker, stirring until dissolution and standing; C, filtering with a piece of filter paper and washing the beaker for a plurality of times with a hot nitric acid solution; D, moving the obtained filter liquor to a measuring flask, diluting to the specified volume and shaking up; E, moving the solution with constant volume to a cone-shaped bottle, first adding an ammonium fluoride and saturated thiocarbamide solution and then adding a methyl orange solution; F, toning the solution with a hexamethylene tetramine solution until the red color disappears; and G, adding a dimethyl orange indicator, toning the solution with an EDTA standard solution with the concentration of c until the solution turns from red into yellow, wherein the dosage of the EDTA standard solution is V. Therefore, the mass fraction of lead can be calculated according to the formula. The analyzing method is simple and convenient to operate, has high accuracy and high analyzing speed, and provides an accurate, efficient and low-cost method for detecting lead content.

Description

technical field [0001] The invention relates to a method for detecting the content of metal elements, in particular to an analysis method for the content of lead in tin-lead alloys. [0002] Background technique [0003] Tin-lead alloys include lead-based and tin-based bearing alloys, and cadmium-based bearing alloys are collectively referred to as babbitt alloys. It has a small friction coefficient, good toughness, thermal conductivity and corrosion resistance, and is mainly used to make sliding bearings. Tin-lead alloys can also be used to produce various exquisite alloy ornaments and alloy handicrafts, such as rings, necklaces, bracelets, earrings, brooches, buttons, tie clips, hat ornaments, craft decorations, alloy photo frames, religious emblems, miniature statues , Souvenirs, etc. The lead-tin alloy used as alloy jewelry and alloy handicraft material has the following characteristics: 1. The performance of the tin-lead alloy is stable, the melting point is low, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 石维颜景林郑海鹏
Owner SHANGHAI FALAB TEST
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