Ceramic metal oxide composite anode for cathodic protection

A technology of ceramic metal and composite anode, which is applied in the field of ceramic metal oxide composite anode for cathodic protection, can solve the problems of high electrochemical activity, anode failure, insufficient protection of titanium matrix, etc., and achieves high electrochemical activity and easy processing. , the effect of low consumption rate

Inactive Publication Date: 2006-06-21
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This anode using iridium oxide has stronger corrosion resistance than the ruthenium oxide anode, but its electrochemical activity is not as high as the oxide anode containing ruthenium oxide
In addition, iridium tin oxide is not the most stable oxide and cannot provide sufficient protection for the titanium substrate. Under the conditions of high current density or aerobic precipitation, the underlying titanium substrate is still easy to form a passivation film and cause anode failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016]Using a titanium plate with a purity higher than 99.5% as the substrate, etch it in an oxalic acid solution to remove the oxide film on the surface to form a uniform rough surface; dissolve chloroiridic acid and tantalum chloride at a molar ratio of Ir:Ta of 70:30 The coating solution composed of isopropanol is painted on the treated substrate, dried with an infrared lamp, and then sintered at 450°C to 600°C for 10 to 15 minutes. Repeat the above operation for a total of 6 times to prepare IrO 2 -Ta 2 o 5 Ceramic oxide corrosion-resistant intermediate layer; paint the coating solution prepared by ruthenium trichloride, chloroiridic acid and butyl titanate according to the molar ratio of Ru:Ir:Ti of 20:10:70 on the anode of the existing intermediate layer On the surface, after drying, sinter at 350°C to 500°C for 10 to 15 minutes, repeat the above process, and paint a total of 9 times, and the last sintering time is about 1.5 hours to prepare RuO 2 -IrO 2 -TiO 2 The s...

Embodiment 2

[0020] The same method as in Example 1 was used to prepare the ceramic metal oxide composite anode for cathodic protection containing an intermediate layer of the present invention. A platinum-titanium composite anode was used as a comparison sample. The consumption rate of the anode and the polarization potential in seawater were tested. The test medium for oxide anode consumption rate is seawater, and the anode current density is 1000A / m 2 . The consumption rates for platinum-titanium anodes were taken from literature. The test conditions of the polarization potential are the same as in Example 1. The results are listed in Table 2. The anode of the present invention has lower polarization potential and consumption rate than the platinum-titanium anode, indicating that it has higher stability and electrochemical activity.

[0021] Anode material

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PUM

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Abstract

The invention relates ceramal oxidate composite anode used for cathodic protection, comprising base body, intermediate layer and surface layer. The base body adopts metallic titanium or niobium; intermediate layer adopts ceramal oxidate IrO2-Ta2O5 in which the proportion of Ir and Ta is (50-90):(10-50); the surface layer is RuO2-IrO2-TiO2 in which the proportion of Ru,Ir and Ti is (15-25):(5-15):(60-70). The composite anode possesses not only the good electrochemistry activity, but also the high stability and low consumption rate. The method suits for impressed current cathodic protection system and other electrochemistry industry.

Description

Technical field: [0001] The invention relates to a ceramic metal oxide composite anode for cathodic protection, which is mainly used in an impressed current cathodic protection system to prevent electrochemical corrosion of metal structures in seawater, brackish water, fresh water and soil, and can also be used for the occurrence of sodium hypochlorite Devices, electroplating, sewage treatment and other electrochemical industries. Electrochemical [0002] technology field. technical background: [0003] Cathodic protection can effectively prevent the corrosion of metal structures such as steel in aqueous media and electrolytes such as soil. According to the different ways of providing cathodic protection current, it can be divided into two methods: sacrificial anode and external current. The sacrificial anode generates cathodic protection current through the dissolution and consumption of the electronegative anode material itself; while the impressed current cathodic prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/16
Inventor 许立坤王廷勇
Owner SUNRUI MARINE ENVIRONMENT ENG
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