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Preparation method for coating alloy coating containing permanent chemical modifier on graphite pipe

A technology of alloy coating and graphite tube, applied in metal material coating process, coating, liquid chemical plating, etc., can solve the problems of batch analysis detection limit, large amount of palladium solution, increase of analysis time, etc., and achieve test results Good, low cost, less dosage effect

Active Publication Date: 2015-05-27
广西益谱检测技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If pre-mixing is used and the machine is used, the amount of palladium solution is large, the cost is high, one step is added and the analysis time is increased, and the content of some trace elements in the palladium solution is relatively high, which will affect the analysis results of such trace elements; If expensive high-purity palladium salts are used, the impact will be eliminated, but the cost will increase; therefore, the batch analysis and detection of the above method will be limited to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]A preparation method for covering a graphite tube with an alloy coating containing a durable chemical modifier, comprising the steps of preparing a coating solution, graphite tube pretreatment, and graphite tube alloy coating. The process steps are:

[0038] (1) prepare coating solution: prepare tantalum-palladium mixed solution, make the mass concentration of tantalum and palladium in pure metal meter be respectively in the mixed solution: tantalum 20g / L, palladium 2g / L;

[0039] (2) Graphite tube pretreatment: put the pyrolytically coated graphite tube into the graphite furnace atomic absorption spectrometer, and age the unworked graphite tube once to remove impurities on the surface of the pyrolytically coated graphite tube;

[0040] (3) Graphite Tube Alloy Coating: Put the mixed solution of tantalum and palladium into the designated position of the autosampler, start the operation of the graphite furnace atomic absorption spectrometer, and the operation procedure is a...

Embodiment 2

[0054] A preparation method for covering a graphite tube with an alloy coating containing a durable chemical modifier, comprising the steps of preparing a coating solution, graphite tube pretreatment, and graphite tube alloy coating. The process steps are:

[0055] (1) prepare coating solution: prepare tantalum-palladium mixed solution, make the mass concentration of tantalum and palladium in pure metal meter be respectively in the mixed solution: tantalum 20g / L, palladium 2g / L;

[0056] (2) Graphite tube pretreatment: first check whether the pyrolytic coating surface of the graphite tube that has been worked is intact. heat up;

[0057] (3) Graphite Tube Alloy Coating: Put the mixed solution of tantalum and palladium into the designated position of the autosampler, start the operation of the graphite furnace atomic absorption spectrometer, and the operation procedure is as follows:

[0058] ①Sampling and liquid addition: heat the temperature to 105°C, add 40 μL tantalum-pall...

Embodiment 3

[0070] A preparation method for covering a graphite tube with an alloy coating containing a durable chemical modifier, comprising the steps of preparing a coating solution, graphite tube pretreatment, and graphite tube alloy coating. The process steps are:

[0071] (1) prepare coating solution: prepare tantalum-palladium mixed solution, make the mass concentration of tantalum and palladium in pure metal meter be respectively in the mixed solution: tantalum 20g / L, palladium 2g / L;

[0072] (2) Graphite tube pretreatment: check whether the pyrolytic coating surface of the graphite tube that has been worked is intact, if it is intact, put the pyrolytic coated graphite tube into the graphite furnace atomic absorption spectrometer, and perform the next step of sample injection and temperature rise ;

[0073] (3) Graphite Tube Alloy Coating: Put the mixed solution of tantalum and palladium into the designated position of the autosampler, start the operation of the graphite furnace at...

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PUM

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Abstract

The invention relates to a preparation method for coating an alloy coating containing a permanent chemical modifier on a graphite pipe, the preparation is realized on a graphite pipe with a pyrolytic coating, a tantalum palladium mixed solution with mass concentration of 2g / L tantalum and 2g / L palladium (according to pure metal) is added by an apparatus in a thermal feed manner and is coated in the center of the bottom of the inner wall of the graphite pipe in a concentrated manner; through temperature programming, the atom melting solution of tantalum palladium and steam are adhered on the inner wall of the graphite pipe by only once atomization, so as to form a tantalum palladium alloy layer, the alloy layer in the center of the bottom of the inner wall is thicker and more even (the effective position of the sample is tested), the alloy layers of the top and side of the inner wall are thinner. The method is simple, fast and automatic; the alloy coating graphite pipe can be used for about 200 times effectively in test of heavy metal cadmium and copper, and then the tantalum palladium alloy coating can be prepared again for the graphite pipe, the effect is equivalent, the alloy layer can be prepared for multiple times, and the service life of the graphite pipe is prolonged.

Description

technical field [0001] The invention relates to a graphite tube manufacturing technology, in particular to a preparation method for covering a layer of a tantalum-palladium alloy layer on the inner wall of a pyrolysis-coated graphite tube used in a graphite furnace atomic absorption spectrometer. Background technique [0002] Prolonging the life of the graphite tube of the graphite furnace atomic absorption spectrometer can greatly reduce the operating cost of the instrument. At present, the graphite furnace atomic absorption spectrometer mainly uses pyrolytic coated graphite tubes, which have a lifespan several times longer than ordinary graphite tubes and have better performance. At present, there are two main methods to further prolong the service life of graphite tubes: one is to coat graphite tubes with a better coating; the other is to reduce the atomization temperature. The conventional method of making graphite tube coating is: manual coating solution on the graphit...

Claims

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Application Information

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IPC IPC(8): C23C18/08
Inventor 甘志勇彭靖茹农耀京李鸿蓝唯蒋越华李乾坤梁宏合杜国冬时鹏涛秦玉燕梁冬丽陈永森韦璐阳
Owner 广西益谱检测技术有限公司