Alpha and beta double-phase brass metallographic corrosive agent and metallographic structure displaying method

Abstract

The invention discloses an alpha and beta double-phase brass metallographic corrosive agent and metallographic structure displaying method. The alpha and beta double-phase brass metallographic corrosive agent is prepared from the following components: 300-600 g of potassium dichromate K2Cr2O7, 60-150 g of ammonium chloride NH4Cl, 300-500 mL of sulfuric acid H2SO4, 400-600 mL of nitric acid HNO3, and the balance of water H2O, wherein the volume is metered to be 12 L; the displaying method comprises the steps: an alpha and beta double-phase brass sample adopts the water as a wetting agent to beground sequentially through 200-mesh, 600-mesh, 800-mesh and 1500-mesh silicon carbide or aluminum oxide waterproof abrasive paper; the ground sample is polished; the sample is flushed through water and blow-dried; the sample is corroded through the corrosive agent; the sample is flushed through water and blow-dried; and the structure of the sample is observed through a metallographic microscope and recorded. By preparing the corrosive agent which is effective for the metallographic structure of alpha and beta double-phase brass and optimizing the corrosion process, excessive corrosion of a conventional copper alloy corrosive agent to the alpha and beta double-phase brass is avoided, thus the detected phase proportion and grain structure are clearer and more accurate, and the alpha and beta double-phase brass structure is managed and controlled in the production and scientific research processes more advantageously.

Description

technical field [0001] The invention belongs to the technical field of metallographic corrosion and relates to a metallographic etchant, in particular to an α, β duplex brass metallographic etchant and a method for displaying the α, β duplex brass metallographic structure. Background technique [0002] The internal structure of metal materials is directly and closely related to its physical properties such as strength, hardness, and elongation, and has an important impact on the cold and hot processing properties of materials. Metallography refers to the chemical composition of metals or alloys and the physical and chemical states of various components inside metals or alloys. Through metallographic observation, it can directly and effectively reflect the internal structure of metal materials. It is the most widely used in material research and production. a means of detection. [0003] Duplex brass means that in addition to the α phase with good plasticity, there is also a...

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Problems solved by technology

[0007] The corrosive agents of the above two patents are mainly composed of hydrogen peroxide and ammonia water, which are suitable for corrosion and polishing of pure copper or copper alloys with high copper content. For α and β duplex brass, it will also cause excessive corrosion, resulting in metallographic structure Inaccurate observation and evaluation

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