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Apparatus for studying electrochemical behavior of material corrosion, and in-situ TEM method thereof

A technology for studying materials and electrochemistry, applied in the field of devices for studying the electrochemical behavior of corrosion of materials, to achieve the effect of corresponding observation

Inactive Publication Date: 2014-08-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the current research status of small-scale characterization corresponding to the initial stage of pitting corrosion, the present invention designs an in-situ (external environment, anode polarization) TEM research method to study this type of problem

Method used

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  • Apparatus for studying electrochemical behavior of material corrosion, and in-situ TEM method thereof
  • Apparatus for studying electrochemical behavior of material corrosion, and in-situ TEM method thereof
  • Apparatus for studying electrochemical behavior of material corrosion, and in-situ TEM method thereof

Examples

Experimental program
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Embodiment 1

[0026] Cut a 316F cold-rolled stainless steel rod with a diameter of 10mm (Nippon Steel Corporation, Japan) into thin slices with a length of 1 cm and a thickness of about 300 μm in the axial direction, and grind the thin slices to about 120 μm with SiC sandpaper with a particle size of 2000. The hole is punched into a disc with a diameter of 3 mm, and it is ground to about 30 μm, and then polished, pitted, and ion-thinned to make a TEM sample, and then used such as figure 1 The fixture shown is packaged as an electrode, the working electrode. Configure 0.5mol / L NaCl solution, the test solution is kept at 28°C by a constant temperature water bath, and the packaged sample is tested for the potentiodynamic polarization curve in the solution, and the test is stopped when the transient current peak does not appear on the curve. Test results such as figure 2 shown. The sample after the polarization test was removed from the fixture, soaked in absolute ethanol to remove the resid...

Embodiment 2

[0031] Solution preparation, electrode packaging, and subsequent processing are the same as in Example 1. Conduct potentiodynamic polarization curve test on TEM sample in 0.5mol / L NaCl solution, stop polarization test when transient current peak appears on the curve (such as Figure 4 shown), and then observed by TEM, the obtained HAADF-STEM morphology is as follows Figure 5 (b~f) shown. The results show that at this time, the MnS inclusions are severely dissolved, and the dissolution has extended to the stainless steel substrate, forming corrosion pits with a size of 1~2um, that is, metastable pits, indicating that the anode corresponding to the passivation interval of the polarization curve The transient current peak is the process of metastable pitting corrosion. In previous studies, due to the limitation of the spatial resolution of the observation means, it has been controversial whether the corrosion process corresponding to the transient current peak is the dissoluti...

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Abstract

The invention discloses an apparatus for studying electrochemical behavior of material corrosion, and an in-situ TEM method thereof, and belongs to the research field of corrosion electrochemistry behaviors. The apparatus comprises an upper plastic shell, a lower plastic shell, a platinum sheet and an aluminium conductive wire. The upper plastic shell is provided with a hole having a diameter of 2 mm; an upper surface of the lower plastic shell is embedded with the platinum sheet; the platinum sheet is connected to one end of the aluminium conductive wire; the other end of the aluminium conductive wire extends to the outer part of the lower plastic shell; the platinum sheet is provided with a pad, a TEM sample and the upper plastic shell in sequence; and the TEM sample contacts with electrolyte out of the apparatus through the hole on the upper plastic shell. The TEM sample is encapsulated in to an electrode by using the apparatus; then test of an electrochemical curve is carried out in the electrolyte to obtain electrochemical information; and the sample after the test is observed and characterized by TEM. The method can realize in-situ study of structural evolution in an electrochemical corrosion process in small size, thereby realizing corresponding observation of the electrochemical information and the structural evolution.

Description

technical field [0001] The invention relates to the technical field of a research method for electrochemical corrosion behavior, in particular to a device for studying electrochemical corrosion behavior of materials and an in-situ (external environment, anode polarization) TEM method thereof. Background technique [0002] Electrochemical polarization curve testing technology is a common method to study the electrochemical behavior of material corrosion. By observing the corrosion morphology corresponding to the characteristic position of the polarization curve, it is possible to know what kind of corrosion process occurs corresponding to certain characteristics of the electrochemical curve. Taking austenitic stainless steel as an example, when the solution contains aggressive anions, it presents a typical polarization curve of passivation-pitting corrosion characteristics, the activation zone, activation-passivation transition zone, passivation zone and stable The electroch...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N23/22G01N1/32
Inventor 张波周杨韬马秀良
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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