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Method for Rapidly Forming Dense Silver Chloride Coating and Silver Chloride Electrode Prepared Thereby

A silver chloride, dense technology, applied in the field of corrosion and protection of reinforced concrete structures, can solve the problems of general reproducibility of AgCl electrodes, large difference in slope of response curve, cumbersome preparation of anodic chlorination method, etc., and achieve potential reproducibility Excellent, efficiency-enhancing, and manufacturing-time-reducing effects

Active Publication Date: 2017-12-22
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the anodic chlorination method is cumbersome to prepare in the early stage, the electroplating process is extremely time-consuming, the reproducibility of the electroplated AgCl electrode is average, and the slope of the response curve of the electrode potential to the concentration of chloride ions is quite different from the theoretical value.

Method used

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  • Method for Rapidly Forming Dense Silver Chloride Coating and Silver Chloride Electrode Prepared Thereby
  • Method for Rapidly Forming Dense Silver Chloride Coating and Silver Chloride Electrode Prepared Thereby
  • Method for Rapidly Forming Dense Silver Chloride Coating and Silver Chloride Electrode Prepared Thereby

Examples

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Embodiment 1

[0032] Prepare the chloride ion selective electrode: weld one end of the silver wire to one end of the copper cable, seal the welding place with epoxy resin, then pretreat the silver wire at the exposed end according to the above method, soak the pretreated silver wire in AgCl In the plating solution: the immersion time in the AgCl plating solution and the sodium hypochlorite solution content in the AgCl plating solution are shown in Table 1 below.

[0033] AgCl plating solution comprises the following components by weight percentage: sodium hypochlorite solution (wherein available chlorine content 10%) content is shown in Table 1, and solid caustic soda content is 1%, and fatty alcohol polyoxyethylene ether sulfate sodium salt (AES) content is 0.35% , and the balance is distilled water.

[0034] Wherein, the silver wire has a diameter of 0.3 mm and a length of 8 mm. The welding end of the silver wire, the welding place with the copper cable, and the welding end of the copper...

Embodiment 2

[0039] Such as figure 2 as shown, figure 2 The SEM picture of the electrode prepared for Example 1; for the chloride ion selective electrode produced in Example 1, the surface microscopic morphology of the prepared electrode was observed with an electron microscope. figure 2 (a)-(h) in (a)-(h) respectively correspond to the SEM figure of the electrode of A1-A8 that embodiment 1 prepares because A3 and A7 preparation method are the same, so figure 2 (c) and figure 2 (g) is the same. from figure 2 From (a) to 2(d), it can be seen that when the immersion time is the same, the higher the sodium hypochlorite content in the plating solution composition, the denser the electrode surface coating. In addition, when the sodium hypochlorite content reaches 40%, the coating on the electrode surface is very dense, even if the concentration of sodium hypochlorite is increased again, the compactness of the coating will not increase significantly; by figure 2 From (e) to 2(h), it ...

Embodiment 3

[0041] Select the electrode whose serial number is A3 among the embodiment 1, and the chloride ion content is respectively 1,0.1,0.01,10 -3 and 10 -4 moL -1 The electrode potential was tested in the concrete simulated liquid.

[0042] According to the Nernst formula, the electrode potential can be expressed by the following formula (1):

[0043]

[0044] However, the response relationship between the actual electrode potential and the log value of the chloride ion concentration cannot strictly follow the Nernst formula, so it is necessary to determine the true slope of the electrode potential to the log value of the chloride ion concentration. Such as image 3As shown, the slope of the response curve of the electrode potential and the log value of the chloride ion concentration is about 50mV / decade.

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Abstract

The invention discloses a method for rapidly forming a dense silver chloride coating, which belongs to the technical field of corrosion and protection of reinforced concrete structures, and comprises the following steps: 1) welding one end of the silver wire to one end of a copper cable, and sealing the welding with epoxy resin , then pretreat the silver wire at the exposed end, and soak the pretreated silver wire in the AgCl plating solution; 2) After the silver wire is soaked in the AgCl plating solution for 10-60 minutes, a layer of black dense chloride is formed on the surface Silver plating. A method for quickly forming a dense silver chloride coating on the surface of a silver wire according to the present invention utilizes the strong oxidizing properties of hypochlorite to manufacture chloride ion selective electrodes in a short period of time; The time improves the efficiency of manufacturing electrodes, and at the same time, the potential reproducibility of the electrodes produced by the method is excellent, and the response curve of the potential to the concentration of chloride ions is good.

Description

technical field [0001] The invention belongs to the technical field of corrosion and protection of reinforced concrete structures, and in particular relates to a method for rapidly forming a dense silver chloride coating and a silver chloride electrode prepared therefrom. Background technique [0002] Steel bar corrosion is the main reason for the decline in the durability of concrete structures, which seriously threatens the service safety of concrete structures; while chloride ion intrusion is the main factor causing steel bar corrosion, when the concentration of free chloride ions in the concrete pore fluid around the steel bar exceeds the corrosion critical Concentration, steel will corrode. Therefore, it is of great practical significance to monitor the free chloride ion concentration in the concrete protective layer in real time to provide data support for the durability evaluation and remaining life prediction of concrete structures, and to ensure the durability and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 蒋林华金鸣陶德彪徐金霞陈敏尹武晓查捷
Owner HOHAI UNIV
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