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Analysis and regulation method for pure oxalic acid anode oxidation bath liquid

A technology of anodic oxidation tank and oxalic acid, which is applied in the field of analysis and control of pure oxalic acid anodic oxidation bath solution, can solve the problems of poor reproducibility of the titration analysis method of free oxalic acid, difficulty in judging the end point, large error of analysis results, etc., and achieve accurate method Reliable, guaranteed accuracy, simple operation results

Inactive Publication Date: 2019-04-16
XIAN AERO ENGINE CONTROLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are a small number of analysis methods about oxalic acid anodic oxidation solution, the titration analysis method for free oxalic acid has poor reproducibility, the end point is difficult to judge, and the content of free oxalic acid is calculated through indirect conversion, resulting in large errors in analysis results. There is an urgent need for an analysis method for the oxalic acid anodizing bath that is compatible with this system, so that the pure oxalic acid anodizing technology can be widely used

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  • Analysis and regulation method for pure oxalic acid anode oxidation bath liquid
  • Analysis and regulation method for pure oxalic acid anode oxidation bath liquid
  • Analysis and regulation method for pure oxalic acid anode oxidation bath liquid

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Embodiment 1

[0053] Embodiment 1 Comparative Example

[0054] In this embodiment, the bath solution analysis and control method adopted in the prior art (the label in the step is indicated by A beginning) and the bath solution analysis and control method adopted in the present invention (the label in the step is indicated by B at the beginning) Compare.

[0055] The prior art analyzes and regulates the pure oxalic acid anodic oxidation bath solution according to the following steps:

[0056] A1) Determination of oxalic acid concentration: draw 1ml of oxalic acid solution in a 250ml Erlenmeyer flask, add 100ml of deionized water, and then add 20ml of sulfuric acid aqueous solution (volume ratio of water to concentrated sulfuric acid is 1:1, density 1.84g / ml), Phosphoric acid (density 1.68g / ml) 1ml, then heat the analysis solution to 70°C, use 0.02mol / L potassium permanganate standard solution to titrate until a slight red color appears, the duration of the red color is 1 minute, record Th...

Embodiment 2

[0094] Embodiment 2: This embodiment is the result of analyzing the sample by using the analysis and control method provided by the present invention alone.

[0095] Adopt the present invention to analyze the free oxalic acid of the pure oxalic acid anodizing bath liquid of preparation known concentration, the analysis result of its result liquid sample 2 is as table 2:

[0096] Table 2 Analysis results of free oxalic acid in sample 2 oxalic acid anodizing solution

[0097]

[0098]

Embodiment 3

[0099] Embodiment 3: According to the analysis result of the adjusted pure oxalic acid anodic oxidation bath solution according to the present invention.

[0100] If the concentration of the pure oxalic acid anodizing bath solution is 56g / L of free oxalic acid, the formula for adding is as follows:

[0101] C 0 V 0 =CV+m

[0102] In the formula:

[0103] C 0 is the concentration of the planned oxalic acid anodizing solution;

[0104] V 0 is the volume of the planned oxalic acid anodizing solution;

[0105] C is the concentration of free oxalic acid in the oxalic acid anodic oxidation solution after using for a period of time;

[0106] V is the volume of oxalic acid anodizing solution after using for a period of time;

[0107] m is the mass of oxalic acid that needs to be added;

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Abstract

The invention belongs to the field of material surface treatment, and relates to an analysis and regulation method for a pure oxalic acid anode oxidation bath liquid. The method comprises the following steps of 1) measuring the concentration of free oxalic acid in the pure oxalic acid anode oxidation bath liquid; 2) measuring the concentration of oxalic acid in the pure oxalic acid anode oxidationbath liquid; 3) obtaining the concentration of aluminum ions in the pure oxalic acid anode oxidation bath liquid according to the concentration of the free oxalic acid obtained in the step 1) and theconcentration of the oxalic acid obtained in the step 2); and 4) supplementing or adjusting components in the pure oxalic acid anode oxidation bath liquid according to the concentration of the free oxalic acid obtained in the step 1) and the concentration of the aluminum ions obtained in the step 3). According to the analysis and regulation method for the pure oxalic acid anode oxidation bath liquid, the pure oxalic acid anode oxidation bath liquid can be conveniently adjusted and controlled, operation is simple, the reproducibility is good, the accuracy is high, the titration end point is easy to judge, and the practicability is high.

Description

technical field [0001] The invention belongs to the field of material surface treatment, and relates to a solution analysis and supplement or adjustment method, in particular to an analysis and control method of a pure oxalic acid anodic oxidation bath solution. Background technique [0002] Anodizing is the most widely used and most successful technology in the surface treatment technology of aluminum, and it is also the most in-depth and comprehensive technology of research and development. The anodized film of aluminum can effectively protect the aluminum substrate from the corrosion of the atmospheric environment and marine environment. The oxalic acid anodic oxidation technology of aluminum alloy is an anodic oxidation technology based on anodic oxidation, with high hardness and high wear resistance of anodized film as the primary characteristics. It is generally used for general engineering applications or military applications, and is widely used in the aerospace fie...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 周佳任可真吴雨桥张立裴玉汝刘静
Owner XIAN AERO ENGINE CONTROLS
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