Method for analyzing composite type sodium polysulfide in aluminum alloy alkalization milling liquid

A sodium polysulfide and composite technology, which is applied in the direction of chemical analysis by precipitation, can solve the problems of large analysis error, inaccurate analysis, large error, etc., and achieve the effect of accurate results and simple process

Inactive Publication Date: 2014-08-13
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline chemical milling of aluminum alloys in domestic aviation companies has problems such as large consumption of sodium sulfide, inaccurate analysis, and experience in supplementary processing in actual production, which seriously affects the corrosion uniformity of aluminum alloys, thereby affecting the aluminum alloying process. Precision control of milling, so it is very important to accurately analyze the concentration of sodium sulfide in the bath
[0003] At present, the common methods for analyzing sodium sulfide content in aluminum alloy alkaline milling fluid are iodine titration and potassium dichromate oxidation method. When ordinary sodium sulfide is used for chemical milling, the iodine titration method and potassium dichromate oxidation method have large errors in the analysis of sodium sulfide

Method used

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  • Method for analyzing composite type sodium polysulfide in aluminum alloy alkalization milling liquid
  • Method for analyzing composite type sodium polysulfide in aluminum alloy alkalization milling liquid
  • Method for analyzing composite type sodium polysulfide in aluminum alloy alkalization milling liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The basic process formula of aluminum alloy alkaline milling fluid:

[0022] Sodium hydroxide: 160 g / L

[0023] Sodium persulfide: 25.0001g / L

[0024] Triethanolamine: 40 g / L

[0025] Additive A: 0.3 g / L

[0026] Additive B: 0.3 g / L

[0027] Aluminum ion: 10 g / L

[0028] Analysis steps:

[0029] (1) Reagent preparation: Prepare 10% analytically pure BaCl 2 Solution, filtered; mass fraction 20% analytically pure NaClO 4 solution;

[0030] (2) Sampling: Pipette 5 mL of the chemical milling solution after standing in a beaker, and then pipette 20 mL of NaClO 4 solution in a conical flask.

[0031] (3) Oxidation: Slowly pour 5 mL of chemical milling solution into the Erlenmeyer flask, shake well, and rinse the beaker 3-4 times. In order to confirm that all sodium polysulfide is converted into SO 4 2- , heat the solution to boil for 3~5 min;

[0032] (4) Precipitation: After the solution is cooled to room temperature, filter it with quantitative analysis filter ...

Embodiment 2

[0043] The basic process formula of aluminum alloy alkaline milling fluid:

[0044] Sodium hydroxide: 180 g / L

[0045] Sodium sulfide: 25.0008g / L

[0046] Triethanolamine: 45 g / L

[0047] Additive A: 0.3 g / L

[0048] Additive B: 0.3 g / L

[0049] Aluminum ion: 30 g / L

[0050] Analysis steps:

[0051] (1) Reagent preparation: Prepare 10% analytically pure BaCl 2 Solution, filtered; mass fraction 20% analytically pure NaClO 4 solution;

[0052] (2) Sampling: Pipette 5 mL of the chemical milling solution after standing in a beaker, and then pipette 20 mL of NaClO 4 solution in a conical flask.

[0053] (3) Oxidation: Slowly pour 5 mL of chemical milling solution into the Erlenmeyer flask, shake well, and rinse the beaker 3-4 times. In order to confirm that all sodium polysulfide is converted into SO 4 2- , heat the solution to boil for 3~5 min;

[0054] (4) Precipitation: After the solution is cooled to room temperature, filter it with quantitative analysis filter pap...

Embodiment 3

[0065] The basic process formula of aluminum alloy alkaline milling fluid:

[0066] Sodium hydroxide: 200 g / L

[0067] Sodium tetrasulfide: 25.0006g / L

[0068] Triethanolamine: 50 g / L

[0069] Additive A: 0.3 g / L

[0070] Additive B: 0.3 g / L

[0071] Aluminum ion: 50 g / L

[0072] Analysis steps:

[0073] (1) Reagent preparation: Prepare 10% analytically pure BaCl 2 Solution, filtered; mass fraction 20% analytically pure NaClO 4 solution;

[0074] (2) Sampling: Pipette 5 mL of the chemical milling solution after standing in a beaker, and then pipette 20 mL of NaClO 4 solution in a conical flask.

[0075] (3) Oxidation: Slowly pour 5 mL of chemical milling solution into the Erlenmeyer flask, shake well, and rinse the beaker 3-4 times. In order to confirm that all sodium polysulfide is converted into SO 4 2- , heat the solution to boil for 3~5 min;

[0076] (4) Precipitation: After the solution is cooled to room temperature, filter it with quantitative analysis filte...

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Abstract

The invention discloses a method for analyzing composite type sodium polysulfide in aluminum alloy alkalization milling liquid. The method is characterized by comprising the steps of oxidizing an S-containing substance in the milling liquid into high-valence SO4<2-> through potassium perchlorate, depositing SO4<2-> ions through soluble barium salt, weighing generated BaSO4, and calculating the content of the composite type sodium polysulfide according to the weight of the substance of barium sulfate. According to the analysis method, an analysis error is smaller than 0.5 percent. The method mainly comprises the following steps of (1) sampling; (2) oxidization; (3) deposition; (4) filtering and drying; and (5) weighing. The invention discloses the simple method for analyzing the composite type sodium polysulfide in the aluminum alloy alkalization milling liquid; the analysis process is simple, and a result is accurate.

Description

technical field [0001] The invention relates to an analysis method of composite sodium polysulfide, in particular to an analysis method of composite sodium polysulfide in aluminum alloy alkaline milling fluid. Background technique [0002] Chemical milling, referred to as chemical milling, also known as chemical corrosion processing, wet corrosion, etc., is an ancient and non-traditional processing technology. It is to expose the parts to be processed to corrosive media for corrosion, and protect other parts to obtain parts. A processing method of the desired shape and size. Chemical milling has no mechanical chip stress and can process various complex parts. It is an important and indispensable key technology in many manufacturing industries. The proportion of aluminum alloy parts in modern processing structural parts is very high. With the maturity of chemical milling processing technology, my country's aluminum alloy chemical milling has entered the stage of high-precisi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/02
Inventor 刘刚
Owner NANCHANG HANGKONG UNIVERSITY
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