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Measurement method for content of hydrofluoric acid in titanium alloy pickling solution

A technology of titanium alloy acid and measurement method, which is applied in chemical analysis by titration, material analysis by observing the influence on chemical indicators, and analysis by chemical reaction of materials, etc. The recovery rate is only 85%~90%, and it is difficult to guide the actual production, so as to achieve the effect of low cost and accurate analysis method.

Inactive Publication Date: 2015-06-24
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

For the newly prepared bath solution, this method is more accurate, and the recovery rate of standard addition is 97-100%, while for the bath solution that has been used for a long time, due to the interference of impurities in the bath solution, the recovery rate of this method is only 85%-90%
In addition, the titration endpoint of this method is difficult to judge (gradual change rather than sudden change), so this method is difficult to guide the actual production

Method used

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Embodiment Construction

[0024] In order to test the accuracy of the analytical method, a spike recovery test was carried out on 4 unknown dynamic pickling solutions. The spiked substance was hydrofluoric acid, and 3 concentration levels were spiked. The specific implementation method is as follows:

[0025] Original form: Take 50 ml of dynamic pickling solution in a 100ml plastic volumetric flask, add water to dilute to the mark, and shake well.

[0026] Adding standard sample 1: Take 50 ml of dynamic pickling solution in a 100ml plastic volumetric flask, add 20ml of hydrofluoric acid with a concentration of 8.650mol / L, dilute with water to the mark, and shake well.

[0027] Standard sample 2: Take 50 ml of dynamic pickling solution in a 100ml plastic volumetric flask, add 25ml of hydrofluoric acid with a concentration of 8.650mol / L, dilute with water to the mark, and shake well.

[0028] Standard sample 3: Take 50 ml of dynamic pickling solution in a 100ml plastic volumetric flask, add 30ml of hydr...

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Abstract

The invention discloses a measurement method for content of hydrofluoric acid in a titanium alloy pickling solution. The titanium alloy pickling solution comprises the main components including nitric acid, the hydrofluoric acid and fluorotitanic acid. The measurement method adopts an acid-base titration method for measuring the content of the fluorotitanic acid, and adopts a calcium fluoride precipitation method for measuring the content of total fluorine in a bath solution; and the content of the fluorine in the fluorotitanic acid is subtracted by the content of the total fluorine to obtain the content of the hydrofluoric acid in the solution. The measurement method has the advantages that the interferences caused by the fluorotitanic acid can be effectively avoided; the adding standard recovery rate of the content of the hydrofluoric acid, measured by adopting the method, is more than 95%; and the determination requirements on the concentration of the hydrofluoric acid are met and the production can be smoothly carried out.

Description

technical field [0001] The invention relates to a method for analyzing a solution, in particular to a method for measuring the content of hydrofluoric acid in a titanium alloy pickling solution. Background technique [0002] Due to its excellent corrosion resistance, high specific strength, high toughness and weldability, titanium alloys have important applications in the field of aero-engines. The amount of titanium alloys used in some advanced aero-engines has accounted for 25-40% of the weight of the engine. Higher requirements are put forward for the quality of titanium alloy parts, and its quality detection method is mainly fluorescent penetrant detection. [0003] Fluorescent penetrant testing is one of the most important methods for inspecting the surface integrity of industrial components. Fluorescent penetrant testing of titanium alloy parts is to detect opening defects on the surface of workpieces through the optical properties of certain fluorescent substances wh...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/79
Inventor 王春霞冯长杰周雅吴光辉
Owner NANCHANG HANGKONG UNIVERSITY
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