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Aluminum sensor used in hot dip galvanizing process and preparation method thereof

An aluminum sensor and sensor technology, applied in hot dip plating process, metal material coating process, instruments, etc., can solve the problems of poor accuracy, short life, inconvenient use, etc., and achieve improved work performance, simplified preparation, and convenient use. Effect

Inactive Publication Date: 2010-06-30
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since NaCl+NaCl-AlCl 3 The electrolyte is easy to absorb water, and there are some problems in preparation, storage and use, such as difficult preparation and storage, inconvenient use, short life, poor precision, etc.

Method used

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  • Aluminum sensor used in hot dip galvanizing process and preparation method thereof
  • Aluminum sensor used in hot dip galvanizing process and preparation method thereof
  • Aluminum sensor used in hot dip galvanizing process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Press Al 2 (WO 4 ) 3 The stoichiometric ratio weighs the corresponding Al 2 o 3 and WO 3 , the raw material, ZrO 2 Balls and absolute ethanol were mixed according to the mass ratio of 1:2:0.5 and put into a polytetrafluoroethylene ball milling tank. The slurry was obtained after wet ball milling for 10 hours, and the slurry was dried naturally. After the ethanol volatilized, put Calcined in a resistance furnace, the calcined atmosphere is air atmosphere, the calcined temperature is 950°C, after calcined for 12 hours, the temperature is lowered to normal temperature. Add binder PVB (polyvinyl butyral) 1% (percentage by weight, added) to the powder after roasting, wet ball mill it again according to the aforementioned method for 10 hours, and obtain aluminum ion conductor Al after milling and drying in the air. 2 (WO 4 ) 3 Powder.

[0025] Will Al 2 (WO 4 ) 3 The powder is pressed under a pressure of 300MPa to form a disc body with a diameter of 13mm and a thi...

Embodiment 2

[0027] Dense Aluminum Ion Conductor Al 2 (WO 4 ) 3The preparation method of the tube is the same as Example 1. Put Zn-Al (Al content 5wt%) alloy chip 2g as reference electrode in Al 2 (WO 4 ) 3 In the electrolyte tube, the metal Ni wire as the lead wire is inserted into the bottom of the tube, and finally the tube mouth is sealed with high-temperature cement and dried to obtain an aluminum sensor. The structure of the aluminum sensor is as figure 2 shown.

[0028] At 430-550 ℃, after adding different concentrations of aluminum to the zinc solution, the sensor has good response characteristics. The electromotive force between the aluminum concentration and the sensor at different temperatures conforms to the Nernst relationship.

Embodiment 3

[0030] Dense Aluminum Ion Conductor Al 2 (WO 4 ) 3 The preparation method of the tube is the same as Example 1. in Al 2 (WO 4 ) 3 Add 1.5g of Zn-Al (Al content 0.5wt%) alloy chips into the tube and place it in the electrolyte tube, then insert the metal Ni wire as the lead wire into the bottom of the tube, seal the tube opening with high-temperature cement and dry to obtain an aluminum sensor. At 450-520°C, in the zinc liquid containing different concentrations of aluminum, the experiment is carried out with an aluminum sensor, the sensor responds quickly, and the response time is about 50 seconds. At the same temperature, the aluminum concentration and the electromotive force of the sensor conform to the Nernst relationship. .

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Abstract

The invention relates to a novel aluminum sensor and a preparation method thereof which belong to the technical field of electrochemical sensors. The sensor comprises a dense aluminum ion conductive solid electrolyte tube and a Zn-Al alloy reference electrode sealed in the tube. The chemical composition of the aluminum ion conductive solid electrolyte which serves as the electrolyte is Al2 (WO4)3, and the aluminum content in reference electrode Zn-Al alloy is 20 to 1 weight percent. The preparation method of the sensor comprises the following steps: preparation of aluminum ion conductive solid electrolyte powder and the preparation of the tube; and the preparation of the sensor. A concentration cell of the sensor is Al(ax) |Al3+conductor|Zn-Al(as), Ni. The emf expression of the cell is as follows: E=RT / 3Fln (as / ax) (as refers to the activity of Al in the reference electrode, and ax refers to the activity of Al in zinc solution). Because as is known, the activity of Al in the zinc solution can be worked out according to the determined emf E. The invention has the advantages that the solid electrolyte is used to replace molten salt electrolyte, the work performance of the sensor can be significantly improved, so that the preparation is simplified and the use is convenient.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, and in particular relates to a design principle of a potential type aluminum sensor and a preparation method thereof. The sensor is used for effective aluminum content determination and control in continuous hot-dip galvanizing process. Background technique [0002] In the continuous hot-dip galvanized aluminum process, in order to improve the performance of the plated parts, it is necessary to add some alloying elements to the zinc bath, among which aluminum is one of the important elements. Adding aluminum in the zinc bath mainly plays the following roles: improve the smoothness of the zinc layer, inhibit the growth of the alloy layer of the zinc layer, reduce the oxidation of the zinc liquid, and control the formation of zinc slag. Aluminum in the hot-dip galvanizing pool exists in two forms: effective aluminum (that is, free aluminum) and combined aluminum. Effective aluminu...

Claims

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Application Information

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IPC IPC(8): G01N27/406C23C2/06
Inventor 王岭戴磊周会珠李跃华朱靖
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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