Crevice-corrosion-avoiding sample packaging method and structure in stainless steel pitting study

A technology of crevice corrosion and encapsulation method, which is applied in the preparation of test samples, electrochemical variables of materials, etc., can solve the problems of measurement result influence, pitting corrosion measurement result loss of accuracy, etc., achieve low cost, simple process, The results are accurate

Active Publication Date: 2015-10-21
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

As discussed above, these non-passive metals react with aggressive anions; as a result, measurements obtained by electrochemical measurements will be affected
For example, in the measurement of pitting corrosion, electrochemical parameters such as pitting current density must include two parts: the current generated by crevice corrosion and the current generated by pitting corrosion, thus making the measurement results of pitting corrosion inaccurate

Method used

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  • Crevice-corrosion-avoiding sample packaging method and structure in stainless steel pitting study
  • Crevice-corrosion-avoiding sample packaging method and structure in stainless steel pitting study
  • Crevice-corrosion-avoiding sample packaging method and structure in stainless steel pitting study

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Embodiment 1

[0052] Embodiment 1 (adopt packaging structure of the present invention-with pre-passivation treatment)

[0053] 1. Cutting the working electrode: Grinding the 304 austenitic stainless steel sample (Φ10×2mm, 304 austenitic stainless steel composition shown in Table 1) obtained by wire cutting method with 180, 360, 600, 800, 1000, 1200 sandpaper in sequence After leveling, polish it, wipe it with alcohol and acetone, and dry it for later use;

[0054] 2. Pre-passivation treatment: heat the concentrated nitric acid solution with a mass fraction of 25% in a water bath and keep it at 50°C, put the working electrode in it and soak for 90min;

[0055] 3. Encapsulation: Paste a film on the center of the working surface of the working electrode. The thickness of the film is about 1mm and the diameter is 8mm; the working electrode is inlaid with phenolic resin, and the wire is welded on the non-working surface; after the working electrode is inlaid, the The scotch tape is removed, and...

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Abstract

The invention provides a crevice-corrosion-avoiding sample packaging method in stainless steel pitting study. The method comprises the steps of working electrode cutting, prepassivation processing, packaging and passivation film removing. The method is characterized in that in the packaging step, before packaging materials are used for packaging a working electrode of a sample, a film adheres to the center of the working face of the working electrode, film is smaller than the working face of the working electrode, so that the edge where the film does not adhere is reserved on the periphery of the working face of the sample working electrode, after the packaging step is over, the film is removed, and in the passivation film removing step, a cathode polarization method is used for removing a passivation film. The invention further provides a crevice-corrosion-avoiding sample packaging structure in stainless steel pitting study.

Description

technical field [0001] The invention relates to a sample packaging method for avoiding crevice corrosion in stainless steel pitting corrosion research. The invention also relates to a sample packaging structure for avoiding crevice corrosion in stainless steel pitting corrosion research. Background technique [0002] Stainless steel materials are widely used because of their good processing performance and general corrosion resistance, but when they contain Cl - Stainless steel is prone to pitting corrosion in the environment of corrosive ions. Pitting corrosion is an important form of local corrosion of stainless steel. Generally speaking, the morphology of pitting is characterized by the fact that the diameter of the pit hole is smaller than the depth of the pit hole, and the orifice is easily covered by corrosion products and is not easy to be observed. So it is very dangerous. [0003] At present, the parameters used to characterize the pitting corrosion ability of st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N1/28
Inventor 李文胜郑志军石林胡平聂铭王伟钟万里高岩
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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