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Surface modified stainless steel cathode for electrolyser

A stainless steel, electrolyzer technology, applied in electrodes, electrode coatings, electrolysis components, etc., can solve the problem of difficulty in obtaining carbon steel coated cathodes

Inactive Publication Date: 2015-01-07
CHEMETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

) is very difficult to obtain carbon steel coated cathodes that match the 5 to 8 year life expectancy of standard commercial anodes in chlorate electrolysers

Method used

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  • Surface modified stainless steel cathode for electrolyser
  • Surface modified stainless steel cathode for electrolyser
  • Surface modified stainless steel cathode for electrolyser

Examples

Experimental program
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Effect test

Embodiment

[0044] Micro slot test:

[0045] A series of cathode material samples were tested in laboratory microcells under static conditions, but otherwise similar to those experienced in commercial chlorate electrolyzers. Micro-cell construction using a sample of cathode material as the cell cathode and using an adjusted as a cell anode. Both electrodes are flat sheets. Active test surface area is 2cm 2 And the gap between them is 5.8mm. The electrolyte is NaClO with a concentration of 450 / 115 / 5gpl 3 / NaCl / Na 2 Cr 2 o 7 of aqueous solution. These electrodes were immersed in an electrolyte solution at a test temperature of 80°C. Unlike commercial electrolyzers, the electrolyte was not circulated and there was no continuous supply of brine feed during the test.

[0046]Where indicated, various cathode material samples were surface-modified and their roughness was measured prior to assembly into microchannels. Fresh electrolyte is then added, heated to the test temperature, an...

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Abstract

Sodium chlorate is produced industrially via electrolysis of brine and is thus an energy intensive process. An improved cathode for this and other industrial processes is a low nickel content stainless steel whose surface has been suitably modified. With an appropriate amount of surface roughening, the cathode provides for improved overvoltages during electrolysis while still maintaining corrosion resistance.

Description

technical field [0001] The present invention relates to cathode electrodes for use in industrial electrolysis, such as brine electrolysis for the production of chlorate products. In particular, the present invention relates to surface modified, low nickel content stainless steel cathodes for such applications. Background technique [0002] Sodium chlorate is mainly produced industrially by electrolysis of sodium chloride brine to produce chlorine, sodium hydroxide and hydrogen. Chlorine gas reacts immediately with sodium hydroxide to form sodium hypochlorite, which is then converted to chlorate. Throughout the electrolysis process, the complex electrochemical and chemical reactions involved depend on the following parameters: the temperature, pH, composition and concentration of the electrolyte, the potential and overvoltage of the anode and cathode, and the design of the equipment and electrolysis system. To obtain optimal results, important is the selection of cell param...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B1/26
CPCC25B11/04C25B1/265C25B11/02B24C1/06B24C11/00C25B11/057C25B11/051C25B11/046
Inventor P·科扎克D·萨默斯B·兰
Owner CHEMETICS
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