Method for accurate measurement on nitric acid content of chemical corrosion solution for titanium alloy

A technology for chemical corrosion and nitric acid content, applied in the field of chemical analysis, can solve problems such as low nitric acid content determination accuracy, and achieve the effects of obvious changes in the titration end point, high method accuracy, and simple steps.

Inactive Publication Date: 2014-05-28
AECC AVIATION POWER CO LTD
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Problems solved by technology

The methods that can be queried involve steps such as sample separation, fractionation, redox, titration, etc., and the commonly used methods have the following limitations: acid-base titration can only be applied to solutions that do not contain metal impurities and other weak acid and weak base salts ;The det

Method used

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  • Method for accurate measurement on nitric acid content of chemical corrosion solution for titanium alloy
  • Method for accurate measurement on nitric acid content of chemical corrosion solution for titanium alloy
  • Method for accurate measurement on nitric acid content of chemical corrosion solution for titanium alloy

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Example Embodiment

[0029] Example 1:

[0030] In this embodiment, the titanium milling bath is taken as an example, and the method for determining the content of nitric acid adopts the following steps:

[0031] Step 1. Use a PTFE pipette to accurately suck 5.00mL of titanium alloy chemical corrosion solution, place it in a 500mL PTFE volumetric flask pre-filled with 400ml of distilled water, add distilled water to dilute to the mark, and shake the solution evenly . A uniformly mixed dilution of the titanium alloy chemical corrosion solution is obtained.

[0032] Step 2. Use a Teflon pipette to accurately draw 5.00 mL of the above diluent and place it in a 500 mL conical flask. The diluted solution of the titanium alloy chemical corrosion solution divided into 500 mL conical flasks is obtained.

[0033] Step 3, accurately add 25.00 mL of 0.1 mol / L ferrous sulfate standard solution to the 500 mL conical flask for dividing the diluent of the titanium alloy chemical corrosion solution, then add 10 g of so...

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Abstract

The invention provides a method for accurate measurement on nitric acid content of a chemical corrosion solution for titanium alloy. With the presence of high concentration sulfuric acid, NO<3-> is reduced into NO through ferrous sulfate, and the excessive ferrous sulfate is titrated through potassium permanganate standard solution; a Gaikeli funnel is used during the experiment, carbon dioxide produced by sodium bicarbonate ensures complete exhausting of air from an erlenmeyer flask, and carbon dioxide constantly produced during the reaction protects the solution and prevents the entry of external air, so as to ensure sufficient reduction of the solution while preventing the interference from oxygen in the air. The above points show that the experiment method saves time, and can eliminate the influence of metal impurities and other weak-acid or weak-base salt solutions; the end point mutation is obvious during solution titration, so as to measure more accurate nitric acid content.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, in particular to a method for accurately measuring the content of nitric acid in a titanium alloy chemical corrosion solution. Background technique [0002] The main components of titanium alloy chemical corrosion solution are nitric acid and hydrofluoric acid, which are used in chemical milling, dust removal, coloring and surface pre-corrosion of titanium alloy. [0003] At present, the determination of nitric acid content in the national standard and navigation mark mainly includes acid-base titration and redox capacity method. The methods that can be queried involve steps such as sample separation, fractionation, redox, titration, etc., and the commonly used methods have the following limitations: acid-base titration can only be applied to solutions that do not contain metal impurities and other weak acid and weak base salts ;The determination of nitric acid content in mixed acid ca...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 刘朝马静刘红霞李骏涛樊洁王益芳马刚许丽
Owner AECC AVIATION POWER CO LTD
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