Accurate analysis method for tissues of rust layer on steel plate surface

Abstract

The invention discloses an accurate analysis method for tissues of a rust layer on a steel plate surface and belongs to the technical field of observation and analysis on the tissues of the rust layer by a transmission electron microscope. A preparation method disclosed by the invention comprises the following steps: (1) preparing a sample; (2) determining the sample; (3) analyzing the sample. Standard rust layer samples are prepared and an energy loss spectrum of each standard rust layer sample is established; an energy loss spectrum of a rust layer sample to be detected is compared with the energy loss spectrum of the standard rust layer samples; finally, crystal components of the rust layer sample to be detected are determined. According to the analysis method disclosed by the invention, the structure of each phase of each rust layer sample is observed by applying an energy filter of the transmission electron microscope; the analysis method is simple and a determined result is accurate; a brand-new method for physically analyzing and characterizing rust layer components is developed.

Description

technical field [0001] The invention belongs to the technical field of observing and analyzing the rust layer structure with a transmission electron microscope, in particular to an accurate analysis method for the rust layer structure on the surface of a steel plate. Background technique [0002] Corrosion of steel is a common and serious problem, which has brought huge losses to the national economy. Therefore, the research on the corrosion resistance of steel has always been an important work concerned by material researchers. The research on the corrosion resistance of iron and steel materials mainly focuses on the analysis and research of the corrosion product of iron and steel materials - rust layer, so as to understand the corrosion mechanism of iron and steel materials. Generally, the following components mainly exist in the rust layer: α-FeOOH (goethite), β-FeOOH (monocline tetragonal lepidocite), γ-FeOOH (lepidocite), Fe 3 o 4 (magnetite), Fe 2 o 3 (hematite), e...

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Problems solved by technology

Among them, the metallographic microscope can observe the metallographic cross-sectional morphology of the rust layer at a lower magnification (less than 1000 times), and the different phases of the rust layer can be distinguished by using a polarizing microscope. The disadvantage is that the magnification is limited and the fine structure and shape of the rust layer cannot be clearly observed. It is impossible to determine the phase structure of different parts; the scanning electron microscope / electron probe can observe the surface and cross-sectional microscopic morphology of the rust layer at a higher magnification (several times to tens of thousands of times), and the attached energy spectrum or spectrum accessories can analyze The distribution of each element in the rust layer, the disadvantage is that the phase structure analysis cannot be carried out; X-ray / infrared spectroscopy can be used for the phase structure analysis of the rust layer, and the use of infrared spectroscopy can assist X-ray diffraction in the qualitative and quantitative determination of the rust layer. It is impossible to observe the microscopic appearance of different phases of the rust layer at the same time; the transmission electron microscope can observe the microscopic appearance of the rust layer, and can also analyze the structure of different phases, but because the rust powder is magnetic, it is easily absorbed by the pole piece of the electron microscope during observation. Damage caused by electron microscopy, while using electron diffraction to calibrate the structure of different phases has a large error

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