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Method for determining titanium content in copper alloy

A determination method and technology of copper alloys, which are applied in the preparation of test samples, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems affecting color stability, color and luster. Problems such as interference, method accuracy decline, etc.

Inactive Publication Date: 2009-01-28
上海电气集团上海电机厂有限公司
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Problems solved by technology

The detection limit of titanium content in hydrogen peroxide spectrophotometry is 0.30%, increasing the detection limit will reduce the accuracy of the method
Moreover, this method has certain limitations: nickel, cobalt, iron and trivalent chromium ions in copper alloys all have color interference, which must be eliminated by using a test solution without hydrogen peroxide as a reference; Agent hydrogen peroxide itself is not stable enough, it will decompose and disproportionate at normal temperature (2H 2 o 2 =2H 2 O+O 2 ↑), when the solution contains trace impurities or some heavy metal ions such as: Cu 2+ 、Cr 3+ , Fe 2+ and Mn 2+ etc. can accelerate its decomposition and affect the stability of color development

Method used

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  • Method for determining titanium content in copper alloy
  • Method for determining titanium content in copper alloy
  • Method for determining titanium content in copper alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 (verify the best assay condition of the assay method of titanium content in the copper alloy of the present invention):

[0033] Pipette 10.00ml of titanium standard solution into a 50ml measuring flask, add 10.00ml of bottom solution, and add water to about 30ml.

[0034] Then add 1ml of ascorbic acid solution, drop a drop of bromophenol blue indicator, adjust to just blue with ammonia water, immediately adjust to yellow with hydrochloric acid and add 1 drop, add 6ml of acetic acid solution, shake well; accurately add 2.00ml of color-changing acid solution , dilute with water to the mark of the measuring bottle, and shake well.

[0035] Pour the color-developing solution into a 1cm cuvette, add 1-2 drops of ammonium fluoride solution to the remaining solution to remove the color of the complex, and use this as the reference solution.

[0036] Use a photometer to read the absorbance of the above-mentioned chromogenic solution and reference solution at diff...

Embodiment 2

[0039] Embodiment 2 (verify the measurement range of the assay method of titanium content in the copper alloy of the present invention is wide):

[0040] Pipette 0.00ml, 2.00ml, 4.00ml, 6.00ml, 8.00ml, 10.00ml titanium standard solution, place in 6 50ml volumetric flasks, add 10.00ml of bottom liquid respectively, operate according to the test procedure of embodiment 1 respectively, read Measure the absorbance and draw the working curve.

[0041] as table 1 and figure 2 As shown, the test results show that under the test conditions, the titanium content obeys Beer's law in the range of 0-100 μg, and it can be concluded that the method for measuring the titanium content in the copper alloy of the present invention has the advantage of a wide range of measurement. However, as shown in Table 2, other measuring methods have relatively narrow measuring ranges.

[0042] Table 1: Ti content / ug~absorption A relationship table

[0043]

Ti content / ug

0

...

Embodiment 3

[0046] Embodiment 3 (verify the accuracy of the assay method of titanium content in the copper alloy of the present invention is high)

[0047] Weigh 0.2000 g of the copper alloy standard sample (the standard value of titanium in the copper alloy standard sample is 0.51%) and place it in a 100 ml measuring bottle, add 15 ml of nitric acid, heat to dissolve, add 5 ml of urea solution, cool, and dilute to the scale of the measuring bottle , shake well. Pipette 10.00ml of this solution into a 50ml measuring bottle, add water to about 30ml, then add 1ml of ascorbic acid solution, add a drop of indicator, adjust to just blue with ammonia water, immediately adjust to yellow with hydrochloric acid and add 1 drop in excess, Add 6ml of acetic acid solution and shake well. Accurately add 2.00ml of color-changing acid solution, dilute with water to the mark of the measuring bottle, and shake well. Pour the chromogenic solution into a 1cm cuvette. Add 1 to 2 drops of ammonium fluoride ...

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Abstract

The invention discloses a titanium content measuring method of copper alloys, which comprises the following steps: A. a copper alloy sample is weighed and dissolved; B. a solution that is obtained from step A is added into an ascorbic acid solution, pH value of the solution is adjusted between 1.5 and 2.5, and a chromotropic acid solution is further added; C. the solution that is obtained from step B is partly poured into a cuvette and taken as a visualization reagent, a complex compound formed by the titanium and the chromotropic acid is removed from the residue solution, and the residue solution is taken as a reference liquid; and D. a photometer is used for simultaneously measuring the visualization reagent and the reference liquid, absorbency values are measured and read, and the titanium content in the copper alloy is computed according to the absorbency values. The titanium content measuring method of the copper alloys has the advantages of stable color development, good result repeatability, high accuracy and wide measurement range.

Description

technical field [0001] The invention relates to metal detection and inspection, in particular to a method for measuring titanium content in copper alloys. Background technique [0002] The determination of titanium is mainly based on photometry. Existing spectrophotometric methods for the determination of titanium include hydrogen peroxide spectrophotometry and diantipyridine spectrophotometry, both of which have relatively narrow measurement ranges. The detection limit of titanium content in hydrogen peroxide spectrophotometry is 0.30%, increasing the detection limit will reduce the accuracy of the method. Moreover, this method has certain limitations: nickel, cobalt, iron and trivalent chromium ions in copper alloys all have color interference, which must be eliminated by using a test solution without hydrogen peroxide as a reference; Agent hydrogen peroxide itself is not stable enough, it will decompose and disproportionate at normal temperature (2H 2 o 2 =2H 2 O+O ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/28
Inventor 袁萍陈娥
Owner 上海电气集团上海电机厂有限公司
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