Ultrasonic electrochemical method for accurately evaluating stainless steel pitting potential

A technology of pitting potential and stainless steel, which is applied in scientific instruments, preparation of test samples, weather resistance/light resistance/corrosion resistance, etc. It can solve problems such as difficulty in controlling heating rate, crevice corrosion, and difficulty in sealing samples at changing temperatures. Effect of eliminating data dispersion and accurate potential data

Inactive Publication Date: 2008-11-12
FUDAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the critical pitting temperature is difficult to seal when the temperature changes, and crevice corrosion often occurs first; it is diffic...

Method used

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  • Ultrasonic electrochemical method for accurately evaluating stainless steel pitting potential
  • Ultrasonic electrochemical method for accurately evaluating stainless steel pitting potential
  • Ultrasonic electrochemical method for accurately evaluating stainless steel pitting potential

Examples

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Embodiment 1

[0021] Example 1 Pitting corrosion performance evaluation of 316 stainless steel ultrasonic potential polarization curve

[0022] For 316 stainless steel, use the above steps to measure in the invented electrolytic cell with ultrasonic generator, seal the non-working surface with epoxy resin, leave only about 10mm×10mm surface and conduct polarization curve test. The specific conditions for the polarization curve test are: accurately prepare 1mol / L NaCl solution, place it in a water bath, and keep the temperature at 25°C; before the experiment, first pass high-purity nitrogen (99.999%) into the medium solution for 30 minutes to remove oxygen, During the test, ventilation and deoxygenation were continued. A standard three-electrode system was used for electrochemistry: the auxiliary electrode was a graphite electrode; the reference electrode system was composed of a saturated calomel electrode (SCE) and a salt bridge. The test results are as Figure 5 shown, at higher than Eb...

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Abstract

The invention belongs to the technical field of the stainless steel material pitting evaluation, particularly to an ultrasonic electrochemical method for correctly evaluating the stainless steel pitting potential, including: adopting the cleaning action of the ultrasonic electrolytic cell in the pitting growing process to remove the pitting cover mass inhibiting the solution diffusing formed on the surface of the pit, eliminating the data dispersion on the pitting potential and the pitting repassivation caused by the ion diffusion related with the pitting cover porosity, which is favorable to obtaining the unique pitting potential irrespective of the surfacing state of the stainless steel material. The invention is of important use value to correctly and fast evaluate the pitting resistant performance of the stainless steel and research the pitting mechanism of the stainless steel.

Description

technical field [0001] The invention belongs to the technical field of pitting corrosion evaluation of stainless steel materials, and in particular relates to a method for evaluating pitting corrosion potential of stainless steel. Background technique [0002] Pitting corrosion is one of the most common forms of corrosion in easily passivated metals or alloys, and it often occurs in the coexistence of aggressive anions and oxidizing agents. This kind of corrosion has been widely valued and deeply studied because of its strong concealment and great destructiveness. How to evaluate the local corrosion resistance of metals in passivation state has always been one of the research focuses of this kind of materials. [0003] Stainless steel is prone to pitting corrosion in solutions, especially those containing Cl ions. Pitting pores can continue to grow in neutral solutions and eventually lead to failure of stainless steel materials. The reason is that once pitting corrosion i...

Claims

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Application Information

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IPC IPC(8): G01N17/02G01N1/28
Inventor 蒋益明孙道明龚佳高娟张丽华王浩项秋伟李劲
Owner FUDAN UNIV
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