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Method for measuring tin in tin bronze

A determination method and tin bronze technology, which are applied in chemical analysis by titration, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc. The problem of high cost is to achieve the effect of sensitive indicator, low measurement cost and easy observation.

Inactive Publication Date: 2017-01-25
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The atomic absorption method is suitable for the determination of trace amounts of tin; the graphite furnace method is prone to meteorological interference; the investment cost of large-scale instruments such as plasma emission spectrometers is high, and it is difficult to eliminate various interference effects

Method used

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  • Method for measuring tin in tin bronze
  • Method for measuring tin in tin bronze

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Embodiment 1

[0027] 1. Dissolve: Weigh 0.5000g tin bronze sample in a 400mL beaker, add HNO 3 (Density 1.42g / mL) 20mL, 40mL of concentrated HCl (density 1.19g / mL) is heated on a hot plate until the sample is completely dissolved, and diluted with water to 100mL.

[0028] 2. Separation of precipitation: add 2mL FeCl 3 Solution (concentration of 10g / L), use ammonia solution (the volume ratio of ammonia water with a density of 0.9g / mL to water is 1:1), adjust the pH to 8, and use ammonium chloride solution (concentration of 10g / L) to Wash the precipitate until there is no copper ions, and put the precipitate into a 500mL Erlenmeyer flask;

[0029] 3. Titration: add 150mL water, 50mL HCl (density 1.19g / mL), 3g aluminum powder (aluminum foil), 0.5g NaHCO 3 (Solid), then cover the porcelain crucible, heat it until the reaction is complete, remove the triangular flask and cool to room temperature, add 20mL of ammonium thiocyanate solution (concentration of 250g / L), add 5mL of starch solution (solution ...

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Abstract

The invention relates to a method for measuring tin in tin bronze. The method comprises the following steps of (1) dissolution: weighing a tin bronze test specimen in a beaker; using HNO3 and HCl for dissolving the test specimen; performing dilution by water; (2) precipitate separation: adding an FeCl3 solution in a test specimen; regulating the pH value to be 7.5 to 8.5; performing filtering and precipitation; (3) titration: using HCl for dissolution and precipitation; adding aluminum powder or aluminum foils for reduction; then, adding NaHCO3 solid and acid for reaction to exhaust air; performing heating until the reaction is completed; then, using starch solution as an indicator; performing titration by a potassium iodate standard titration solution till the titration terminal point when the solution becomes purple. The method has the advantages that a great number of interferents are removed through the precipitate separation step; after the separation, the reaction is thorough; the terminal point can be easily observed; the measuring result is stable, accurate and fast; the operation flow process is short; the requirements on the equipment and environment conditions are simple; the measuring cost is low; the use of virulent and environment-pollution reagents is also avoided; the environment pollution is small.

Description

Technical field [0001] The invention relates to a method for measuring tin in tin bronze, in particular to a quantitative analysis method for measuring tin in tin bronze by chemical redox titration volumetric method. Background technique [0002] The tin content of tin bronze is generally between 3% and 14%, and it is mainly used to make elastic components and wear-resistant parts. This alloy has high mechanical properties, anti-wear properties and corrosion resistance, easy cutting processing, good brazing and welding properties, small shrinkage coefficient, non-magnetic, and can be used for wire flame spraying and arc spraying to prepare bronze bushes and shafts Coatings such as sleeves, diamagnetic components, and the chemical composition of the tin bronze alloy are of great significance to ensure the mechanical properties and life of the parts. [0003] At present, the analysis methods of tin in tin bronze are commonly used: chemical titration, graphite furnace atomic absorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N31/16
CPCG01N21/78G01N31/16
Inventor 戴文杰常欢刘建华王宴秋
Owner INNER MONGOLIA BAOTOU STEEL UNION
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