Corrosion method of AlSi10Mg alloy grain boundary

By configuring the etching solution and meticulous inlaying, grinding, polishing and cleaning steps, the problem of grain boundary corrosion of AlSi10Mg alloy was solved, the grain boundaries were clearly visible, the sample preparation cost and complexity were reduced, and research progress was promoted.

CN120668442APending Publication Date: 2025-09-19KUNMING DALU TECH CO LTD
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Patent Information

Application Number
CN202510474866.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-16
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

Existing technologies make it difficult to effectively corrode the grain boundaries of AlSi10Mg alloys, resulting in poor sample preparation, increased time and economic costs, and hindering the study of the effects of grain morphology and size on alloy properties.

Method used

The etching was performed using a prepared etching solution (150 mL H2O + 8-10 g KMnO4 + 3-5 g NaOH), combined with mounting, grinding, polishing and cleaning steps, including rough polishing and fine polishing. The etching time was 40-60 seconds and the etching solution temperature was 60°C-80°C.

Benefits of technology

The grain boundaries of the AlSi10Mg alloy are clearly visible, which reduces equipment requirements and operational complexity, saves time and economic costs, and helps to study the effects of grain morphology and size on alloy properties.

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Abstract

The invention discloses a corrosion method of an Al Si 10Mg alloy grain boundary, which mainly comprises the following steps of: 1, preparing a corrosion liquid which comprises the following components: 150mL of NaOH, 8-10g of NaOH and 3-5g of NaOH; 2, embedding an Al Si 10Mg sample; thirdly, the embedded samples are sequentially polished with abrasive paper from 400 meshes to 7000 meshes; 4, roughly polishing the ground sample; 5, smearing a surfactant on the sample subjected to rough polishing, and then carrying out fine polishing; 6, cleaning the polished sample with industrial alcohol; 7, heating the prepared corrosive liquid to 60-80 DEG C, and corroding the sample for 40-60 seconds; 8, cleaning the sample with industrial alcohol after corrosion patterns appear on the surface of the sample; and 9, carrying out drying treatment. After the method is used for corroding the Al Si 10Mg alloy, the crystal boundary of the alloy can be clearly observed, and the method is low in equipment requirement, simple in operation step, capable of saving cost, good in stability and suitable for researching the grain morphology, the grain size, the microstructure performance and the like of the Al S i 10Mg alloy.
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