Corrosion sample inlaying method

Abstract

The invention discloses a corrosion sample inlaying method. The method comprises the following steps of: based on an epoxy resin inlay, which is composed of 60-80% of matrix resin, 10-25% of conductive powder, 2-10% of dispersing agent and 7-15% of curing agent by weight, orderly arranging the sample to be inlaid, namely the corrosion sample, completely covering the sample with a die, and then, pouring the epoxy resin inlay into the die until submerging the corrosion sample; curing 3-12h at room temperature, uncovering flat surface paper, taking out the sample from the die, respectively sanding the sample with 120#, 240#, 400#, 600#, 800# and 1000# sand paper stage by stage, and then, polishing the sample. With the method disclosed by the invention, the processed corrosion sample can be used for metallomicroscopy observation or electron microscopy scanning observation, so that organization, structure and form of the cross section of the corrosion sample are shown integrally and really.

Description

technical field [0001] The invention belongs to the field of testing or analyzing materials by means of measuring their chemical or physical properties, and in particular relates to a mosaic method of a corrosion sample to be tested. Background technique [0002] In the field of corrosion evaluation of metal materials, metallographic microscopes, scanning electron microscopes, etc. are usually used to obtain corrosion morphology images. These images are an important basis for judging corrosion types, analyzing corrosion degrees, and studying corrosion laws and characteristics. However, to carry out metallographic analysis or electron microscope analysis, it is necessary to select and prepare samples suitable for microscopic observation and analysis. Often, the etched material needs to be inlaid with a suitable method for grinding, polishing and viewing. [0003] The quality of the mosaic of corroded materials has an extremely important relationship with the true appearance ...

AI Technical Summary

Problems solved by technology

This method is used to inlay corrosion samples, and there are serious defects: the temperature is relatively high, generally 120-150°C, and the corrosion product layer is easily torn due to the significant difference in thermal expansion coefficient between the corrosion sample and the filler at high temperature. Moreover, if the pressure is too high, generally 17-22 MPa, the corrosion product layer is prone to compression and deformation, which cannot truly reproduce the actual structure of the corroded material.

[0007] The above-mentioned sample mounting methods all have good application effects, but there are still certain deficiencies, such as the method described in patent application CN101319974A, it is difficult to separate the sample preparation from the mold, and the sample preparation is easy to deform and damage; the methods described in patent application CN101551307A and CN101900647A All belong to hot mounting, with high temperature and pressure, which is easy to cause serious damage to the internal structure and structure of the metal sample and affect the analysis results

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