Preparation method of colored metallographic specimens of aluminum alloys of Al-Mg and Al-Mg-Si series

Abstract

The invention discloses a preparation method of colored metallographic specimens of aluminum alloys of Al-Mg and Al-Mg-Si series. By the steps of electrochemical polishing and anode lamination, gas evolution amount can be increased, bubbles are convenient to desorb, the fluidity and the flowing speed of solution are increased, and bubbles adsorbed on the end surface of a specimen can be effectively discharged, so that the electric field applied to the end surface of the specimen is more uniform, and the solution flows at a high speed. The colored metallographic specimens of aluminum alloys can effectively display microscopic structures of different aluminum alloy series, the grain size can be conveniently measured, and the problem that the aluminum alloy grains are difficult to display in the traditional specimen preparation method is solved. The specimens prepared by the preparation method has the advantages of high contrast display, clear grain boundary, and high accuracy of the measurement result when used for color metallographic analysis.

Description

technical field [0001] The invention relates to the field of non-ferrous metal casting, in particular to a method for preparing Al-Mg series and Al-Mg-Si series aluminum alloy color metallographic samples. Background technique [0002] At present, there are many means and methods for detecting the microstructure of materials, such as electron scanning electron microscope, electron transmission electron microscope, electron probe, X-ray flaw detection and high power metallographic microscope, etc., which can be used to detect the microstructure of materials, but each equipment and method of use Each has its own emphasis on the detection parameters. It is very common and effective to use a high-magnification metallographic microscope to observe the microstructure of aluminum alloys, especially the metamorphic effect. Engineers and technicians can predict and judge the performance of metals by observing and analyzing high-power imaging, and analyze various failures and damages....

AI Technical Summary

Problems solved by technology

However, in the traditional aluminum alloy color metallographic sample preparation process, the voltage of the electrolytic polishing and anodic coating steps is low, and the polishing time is too long, resulting in excessive temperature of the electrolyte and polishing solution, resulting in excessive dissolution of the aluminum alloy sample. , the precipitated gas is not easy to leave the surface of the sample, and the flow of the solution is reduced. This kind of preparation process is slow, the success rate of sample preparation is low, the obtained metallographic photos are not clear, and the test results are not accurate.

Especially for Al-Mg series and Al-Mg-Si series aluminum alloys, due to the good corrosion resistance of the substrate, if conventional metallographic preparation methods are used, it is difficult to fully observe the microstructure details that need to be understood, and the metallographic photos are not clear. Unable to distinguish grain boundaries, resulting in inaccurate tissue analysis test results

Images