Preparation Method of Electron Backscattered Diffraction Samples of Surface Coatings of Galvanized Sheets

Abstract

The invention relates to the field of preparation of a sample of a galvanized sheet surface plating layer and discloses a preparation method of an electronic back-scattering diffraction sample of thegalvanized sheet surface plating layer. The preparation method comprises the following steps: pre-treating a test sample, adjusting a double-beam system sample room, setting a cutting region and carrying out ion beam cutting. According to the preparation method of the electronic back-scattering diffraction sample of the galvanized sheet surface plating layer, provided by the invention, an accuratemicro-region processing function of a focused ion beam is used for accurately controlling the cutting thickness of a galvanized layer, the galvanized layer is prevented from being influenced by corrosion and stress and the preparation success rate of the electronic back-scattering diffraction sample of the galvanized sheet surface plating layer is greatly improved.

Description

technical field [0001] The invention relates to the field of sample preparation of the surface coating of a galvanized sheet, in particular to a method for preparing an electron backscattering diffraction sample of the surface coating of a galvanized sheet. Background technique [0002] With the development of the automobile industry, in order to meet the needs of different use environments for the corrosion resistance of the body, the requirements for the corrosion resistance and durability of the body are increasing year by year. In order to extend the service life of automobiles and reduce maintenance costs, developed countries such as Europe and the United States have put forward strict standards and specifications for automobile anti-corrosion performance. In order to prevent corrosion of steel materials, the method of coating protective layer is often used to isolate steel from other corrosive media. The most important application of zinc is the corrosion protection o...

AI Technical Summary

Problems solved by technology

[0009] However, conventional sample preparation methods cannot effectively prepare qualified galvanized layer EBSD analysis samples. The main reasons are as follows:

[0010] 1) Use EBSD to analyze the galvanized layer, mainly to observe and analyze its cross-section, and the thickness of the galvanized layer is generally within 20 μm. Because the area is too small, the use of conventional mechanical polishing, chemical polishing and other means cannot effectively ensure the preservation of complete plating. zinc layer thickness;

[0011] 2) The material and structure of the galvanized layer and the steel base are completely different, so mechanical polishing and chemical polishing cannot be used to uniformly set the working parameters. The surface of the steel base reaches a stress-free state, while the galvanized layer may still have scratches or stress;

[0012] 3) The galvanized layer is generally relatively soft, so it cannot be prepared by mechanical polishing. In the process of electrolytic polishing, the steel base connected to the galvanized layer will corrode the zinc layer, thereby affecting the electrolytic effect.

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