Method for preparing transmission electron microscope sample of rust layer powder test sample

Abstract

The invention discloses a method for preparing a transmission electron microscope sample of a rust layer powder test sample. The method comprises the following steps of: 1) scraping a rust layer from the surface of the test sample, and grinding into powder; 2) adding the rust layer powder into a collodion and isoamyl acetate solution; 3) adding deionized water into a container, dropping the mixed solution on the water to form a film, immediately fishing the mixed solution by using a clean electron microscope grid, and thus forming an organic film on the electron microscope grid; and 4) drying the electron microscope grid to which the rust layer powder is attached, spraying carbon to the surface of the electron microscope grid, and thus obtaining the rust layer sample for transmission electron microscope observation. The sample preparing process is simple, many rust layer powder test samples can be prepared at one time for observation, and the method is very suitable for preparing the transmission electron microscope sample of the rust layer powder test sample. The prepared sample is representative and can really reflect certain characteristics of an analyzed material, and the resolution of images observed in the transmission electron microscope is high.

Description

technical field [0001] The invention relates to the preparation of a sample for transmission electron microscope observation and analysis, in particular to a method for preparing a transmission electron microscope sample of a rust layer powder sample. Background technique [0002] When studying the corrosion resistance of steel materials, the corrosion product-rust layer of steel materials is usually analyzed and studied to understand the corrosion mechanism of steel materials. Scanning electron microscopy is mainly used to observe the microscopic morphology of the rust layer, but cannot analyze the various phases in the rust layer; X-ray diffraction is mainly used for the phase analysis of the rust layer, but cannot be combined with the morphology of each phase. The use of transmission electron microscopy can not only observe the microscopic morphology of each phase in the rust layer, but also analyze the phase structure. Therefore, using transmission electron microscope t...

AI Technical Summary

Problems solved by technology

The rubber powder mixing method is suitable for a small amount of powder samples, and there are few sample preparations at one time, and there are problems such as cumbersome process, easy folding of the film, affecting observation, and long drying time of samples.

Although the improved rubber powder mixing method is more convenient than the rubber powder mixing method, this method is also suitable for a small amount of powder samples, and less samples are prepared at one time; if more samples are prepared at one time, there will be problems such as uneven dispersion

[0008] However, each phase in the rust layer is relatively complex. If the sample preparation is small, it is not representative and cannot truly reflect some characteristics of the analyzed material.

Therefore, it is necessary to prepare a relatively large number of rust layer powder samples for observation, and the current methods for preparing powder samples for transmission electron microscopy are not suitable for the preparation of rust layer powder samples.

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