Hot dip silver coating /silver halides reference electrode and method for making same

A reference electrode, silver halide technology, applied in the direction of material electrochemical variables, weather resistance/light resistance/corrosion resistance, measurement devices, etc. Bond strength, high potential stability, elimination of chalking or peeling effects

Active Publication Date: 2008-11-19
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reference electrode prepared by the above two methods has improved the stability of the electrode, it still has the inherent shortcomings of the powder compaction electrode.
In addition, although the silver / silver chloride reference electrode has good performance in chloride-containing media, there are other halide ions in seawater media besides chloride ions, which can affect the stability of the silver / silver chloride reference electrode. adverse effects on sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: One end of a silver wire with a length of 100mm and a diameter of Φ3 is wound into a spiral shape of Φ15, and the other end is left with a length of about 20mm as a conductive rod for the reference electrode. After polishing the surface of the electrode substrate with fine sandpaper, degrease with acetone. Heat and melt the silver halide, the molar ratio of silver chloride and silver bromide is 80:20, immerse the treated silver substrate in the molten silver halide, take it out and cool it in air to obtain a silver halide solid solution on the silver substrate. It is then placed in a hydrogen atmosphere for reduction, converting 15% of the silver halide to metallic silver. Soak the prepared silver / silver halide reference electrode body in seawater, and use a saturated calomel electrode to measure the change of its electrode potential with the soaking time. The results show that the potential fluctuation of the silver / silver halide reference electrode is It i...

Embodiment 2

[0014] Embodiment 2: Three silver rods with a length of 50 mm and a diameter of Φ6 are used as reference electrode bases. After polishing the surface of the electrode substrate with fine sandpaper, degrease with acetone. The same method as in Example 1 is used to dip-coat silver halide on three samples, but the proportion of silver halide on each sample is different. The surface of sample 1 is pure silver chloride, and the surface of sample 2 is pure silver chloride. The molar ratio of silver to silver bromide was 65:35, and the molar ratio of silver chloride to silver bromide on the surface of sample 3 was 85:15. The prepared three reference electrode bodies were soaked in seawater, and the saturated calomel electrode was used to measure the variation of the electrode potential with the soaking time. The results showed that the potential fluctuation of the sample 1 reference electrode was less than 2mV during 30 days of immersion. The potential fluctuations of the reference ...

Embodiment 3

[0015] Example 3: The reference electrode body prepared in Example 1 is packaged in an electrode sleeve processed with UPVC to form a reference electrode assembly. The working part of the spiral electrode body is located in the cavity of the electrode sleeve, and the other end is connected to the cable. The connecting joints are sealed with epoxy resin. The reference electrode is installed in the underwater part of the hull, and after water enters the cavity of the reference electrode, the electrode body is in direct contact with the seawater. The reference electrode is connected to the potentiostat device of the externally applied current cathodic protection system of the hull as a reference electrode for measurement and control. After the system is powered on, it has been working stably, and the hull has reached -0.8V, which is in a good state of protection.

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PUM

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Abstract

The invention relates to a thermal dip-coating silver / silver halide reference electrode and a method for the production thereof, the reference electrode is composed of silver and silver halide insoluble salt, silver halide is formed on a silver matrix by adopting a thermal dip-coating method for combining with the matrix well, then part of silver halide is transformed into metallic silver through reduction so as to form a silver / silver halide reference electrode body, the silver / silver halide electrode body is packaged in an electrode sleeve processed by insulation materials, thereby forming a solid reference electrode component. The reference electrode of the invention has rather high electric potential stability, the combination between the formed silver halide coating and the matrix is firm due to the adoption of the fusing and dip-coating method, the problem of pulverization or stripping can be eliminated, and the reference electrode has a long service life owing to sufficient dip-coating amount. The reference electrode can be used to measure the metal structure electrode electric potential of mediums in seawater.

Description

Technical field: [0001] The invention relates to a hot-dipping silver / silver halide reference electrode and a preparation method thereof. The reference electrode can be used for measuring the electrode potential of metal structures in seawater medium. It belongs to the technical field of electrochemical protection. Background technique: [0002] The ocean is a very harsh corrosive environment, and metal structures in the marine environment must take appropriate protective measures to avoid corrosion damage. The combination of cathodic protection and coating is an effective method to prevent seawater corrosion of metal structures. In order to analyze the corrosion and protection status of metal structures, it is necessary to accurately measure the electrode potential of metal structures. The reference electrode is a reference electrode used to measure the potential of a metal electrode, and is a comparison benchmark for measurement. In the impressed current cathodic protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N17/02
Inventor 许立坤王均涛
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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