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Method for determining content of micro chlorine ions in surface treatment solution

A chloride ion content and surface treatment technology, applied in the field of electrochemical analysis, can solve problems such as unstable results, inability to give exact chloride ion data, and easy decomposition.

Inactive Publication Date: 2013-01-16
GUIZHOU HONGLIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the ion selective electrode comparison method cannot give the exact data of the trace chloride ion content in the surface treatment solution
The turbidimetric method is used for the determination of trace chloride ions in the surface treatment solution. Due to the easy decomposition and unstable nature of silver chloride by light and heat, the results are unstable, the test conditions are not easy to control, and the requirements for the experimenter are high.

Method used

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  • Method for determining content of micro chlorine ions in surface treatment solution
  • Method for determining content of micro chlorine ions in surface treatment solution
  • Method for determining content of micro chlorine ions in surface treatment solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1. Cl in chromic acid anodizing nickel acetate sealing surface treatment solution - Determination of content

[0091] ① Using a fully automatic potentiometric titrator

[0092] Instrument model: Metrohm 809 automatic potentiometric titration analyzer;

[0093] Materials and appliances: exchange unit 5ml; electrode: silver electrode 6.0430.100;

[0094] ② Reagent:

[0095] AgN03 standard solution: 0.01mol / L;

[0096] NaCl standard solution 500ppm: Weigh the standard NaCl reagent, first dry it at 600°C for 1 hour, accurately weigh 0.5000g, dissolve it with deionized water, dilute to 1000ml, and shake well;

[0097] ③Parameter setting:

[0098] DET pH

[0099] >Start condition

[0100]

[0101] >stop condition

[0102]

[0103] ④ Determination method: Pipette 1.0ml of 500ppm NaCl standard solution into a 100ml tall beaker, add 50ml of deionized water, stir well; use 0.01mol / L AgNO 3 Standard solution, titrated by potentiometric titrator, and record ...

Embodiment 2

[0105] Example 2. Trace amount of C1 in chromium oxalic acid anodizing surface treatment solution - Determination of content

[0106] ① Using a fully automatic potentiometric titrator

[0107] Instrument model: Metrohm 809 automatic potentiometric titration analyzer;

[0108] Materials and appliances: exchange unit 5ml; electrode: silver electrode 6.0430.100;

[0109] ② Reagent:

[0110] AgN03 standard solution: 0.01mol / L;

[0111] NaCl standard solution 500ppm: Weigh the standard NaCl reagent, first dry it at 600°C for 1 hour, accurately weigh 0.5000g, dissolve it with deionized water, dilute to 1000ml, and shake well;

[0112] ③Parameter setting:

[0113] DET pH

[0114] >Start condition

[0115]

[0116]

[0117] >stop condition

[0118]

[0119] ④ Determination method: Take 50.0ml of the surface treatment solution to be tested in a 300ml beaker, add 20g of solid BaCO 3 After fully reacting, the filtrate was colorless, filtered with dry filter paper, took t...

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Abstract

The invention provides a method for determining the content of micro chlorine ions in a surface treatment solution. According to the method, the concentration of chlorine ions to be measured in the solution is improved by means of adding a certain amount of standard solution, so that the content of the micro chlorine ions in the surface treatment solution can be determined rapidly and accurately, and the content of the detected micro chlorine ions is enabled to achieve n ppm level. The method can be applied to the determination of the content of the micro chlorine ions in the surface treatment solutions such as chrome plated, aluminium alloy sulfuric acid anodization, aluminium alloy hard anodization, aluminium alloy chromic acid anodization, aluminium alloy chromic oxalate anodization, various aluminium alloy anodization dichromate sealing, various aluminium alloy anodization nickel acetate sealing and the like.

Description

technical field [0001] The invention relates to a method for measuring the content of trace chloride ions in a surface treatment solution, belonging to the technical field of electrochemical analysis. Background technique [0002] At present, there are three main categories of determination methods for chloride ion content: ① classic constant analysis method, that is, indicator titration that judges the end point of titration according to the color change of the indicator; ② micro and trace analysis methods, namely ion chromatography; ③ based on Potentiometric titration method to determine the end point of titration by the sudden jump of potential, the detection limit is 10 -1 ~10 -5 mol / L, suitable for both constant analysis and detection of trace components. In addition, the determination of chloride ion content can also use ion selective electrode method and turbidimetric method. [0003] As for the surface treatment solution, due to the low content of trace chloride i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42
Inventor 张磊
Owner GUIZHOU HONGLIN MACHINERY
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