Al-Cu series aluminum alloy metallographic testing method

Abstract

The invention discloses an Al-Cu series aluminum alloy metallographic testing method which comprises the following steps: S01, degreasing; S02, immediately performing chemical conversion treatment ona to-be-tested surface of a fresh metallographic sample obtained in S01; S03, drying the tested surface of the metallographic sample treated in S02, grinding to be smooth by utilizing abrasive paper of 1000 meshes or 1500 meshes, and polishing the tested surface of the metallographic sample on a polishing machine by utilizing a diamond liquid abrasive with the abrasive granularity of 0.05-0.1 micron; S04, immediately immersing the tested surface of the fresh metallographic sample treated in S03 so as to obtain a metallographic testing surface; and S05, polishing on the polishing machine againfor 1-2 seconds after corrosion is completed, wiping the to-be-tested surface of the metallographic sample by utilizing absolute ethyl alcohol or acetone, and immediately performing metallographic test by utilizing a metallographic microscope. The invention provides a metallographic testing method targeted at Al-Cu series aluminum alloys. According to the testing method, a flat aluminum alloy sample on the surface of the testing surface can be obtained, and a metallographic figure with clear micro grains can be obtained after corrosion.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, in particular to an Al-Cu series aluminum alloy metallographic testing method. Background technique [0002] Aluminum and aluminum alloys have the advantages of high strength, good thermal and electrical conductivity, strong reflectivity, beautiful color, non-magnetic, good corrosion resistance, good plasticity and formability, and no low-temperature brittleness, etc., and have been widely used in many fields. Since the discovery of aluminum, human society has used it for nearly two centuries. After many years of development and utilization of aluminum alloy, many products with different models and application characteristics have been derived, such as pure aluminum, deformed aluminum alloy, deformed aluminum alloy, etc., and the unique aluminum alloy has been formed according to different composition content and thermal processing technology. Product System. In the classification of al...

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Problems solved by technology

[0004] 1. The use of conventional corrosive liquid can easily lead to excessive corrosion, and the corrosion time is difficult to control. Once excessive, black corrosion products accumulate on the test surface. Although it seems that the microscopic grain boundary structure is very obvious, because the metallographic test is often observed by a plane microscope way, the position difference in the final side view is difficult to adjust, so that the metallographic photos cannot generally present the clearest state, and cannot focus on the overall grain structure

[0005] 2. It is difficult to present a complete grain structure on the corrosion surface by using a low concentration corrosion solution for corrosion

At the same time, due to the low hardness of the aluminum alloy itself, the test surface of the metallographic sample is difficult to be flat

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