Method for displaying color metallographic tissues of pure aluminum
A technology of color metallography and structure, applied in the field of displaying pure aluminum color metallographic structure, can solve the problems of difficult display of microstructure grain boundaries, statistics of grain size errors, inability to distinguish grain boundaries, etc., to achieve clear and identifiable morphology and distribution , easy operation and low labor intensity
Inactive Publication Date: 2014-08-27
SHANGHAI UNIV
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Problems solved by technology
Because pure aluminum is very soft (for example, the Brinell hardness of industrial pure aluminum is only 24-32HB), it is easier to grind when preparing metallographic samples, but under ordinary mechanical polishing methods, the surface is easily scratched and it is difficult to polish to To an ideal degree, after corrosion of such a sample with a dull surface, it will be difficult to display the grain boundaries of the microstructure, and even the grain boundaries cannot be distinguished, which will bring great errors and difficulties to the statistical grain size
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[0021] The samples of industrial pure aluminum (99.7% purity) were ground. The grinding treatment specifically includes: wetting the sample with water as a wetting agent, and then grinding. Use 80-mesh, 240-mesh, 400-mesh, 800-mesh, 1000-mesh, 1500-mesh, and 2000-mesh water sandpaper in sequence to polish the surface to be observed. The time for each sanding can generally be 1-5 minutes, so that it can be roughly flat and free of dust. Grinding surface with excessive scratches. When grinding, the water sandpaper is placed on the pre-grinder and driven by it to rotate. The speed of the pre-grinder can be 200-500r / min. Water flows down continuously above the pre-grinder to moisten and cool the sandpaper. The surface to be observed faces the sandpaper, and keeps the surface in uniform contact with the sandpaper, and presses the sample to grind on the sandpaper. Rotate the sample 90 degrees after changing the sandpaper each time until the scratches from the previous process are ...
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Abstract
The invention provides a method for displaying color metallographic tissues of pure aluminum and belongs to the technical field of preparation of a metallographic sample. The method comprises the following steps: sequentially grinding the sample by using waterproof abrasive paper with the sizes of 80 meshes, 240 meshes, 400 meshes, 800 meshes, 1000 meshes, 1500 meshes and 2000 meshes; mechanically polishing on a lint dipped with one micron of diamond polishing paste; carrying out vibration polishing on the sample for three hours by using a vibration polishing machine; carrying out anode membrane coating, wherein an anode membrane coating solution is prepared from borofluoric acid and distilled water (the mass concentration of the borofluoric acid is more than 40% and the volume ratio is 1.6%-2.0%), the current density is 0.3-0.5A / cm<2> and the anode membrane coating time is 60-80 seconds; washing and drying by blowing, wherein the clear and bright color metallographic tissues of the pure aluminum can be observed by using a polarizing microscope and the crystal boundary is complete and clear. The method has the advantages of simplicity and convenience for operation, low labor intensity and good coloring effect.
Description
technical field [0001] The invention belongs to the technical field of metallographic detection and analysis, and in particular relates to a method for displaying the color metallographic structure of pure aluminum. Background technique [0002] The strength, hardness, ductility and other properties of metal materials are directly and closely related to the internal structure, so metallographic observation is the most direct and effective method to study the internal structure of metal materials. The internal chemical state and physical state, among them, the macroscopic structure (also known as "low-magnification structure") refers to the structure of the metal material observed with the naked eye or a magnifying glass (usually less than 30 times), including the grain size, shape, Distribution and defects in the material (such as shrinkage cavity, pores, cracks, segregation and inclusions, etc.), according to the morphology of the macrostructure, the quality of the metal ma...
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IPC IPC(8): G01N1/28G01N1/32
Inventor 梁冬梁柱元孙杰仲红刚翟启杰
Owner SHANGHAI UNIV