Friends who have done metallography know that cutting, polishing, and polishing are just the foundation, and corrosion is the key step in the "development" of metallographic structure.
In the same sample, polishing is as good as possible. If the corrosion solution is wrongly selected, the ratio is incorrect, and the time control is incorrect, there will be problems such as blurred organization, overcorrosion, unclear grain boundaries, and extremely poor linearity, which will directly lead to the invalidation of metallographic observation, photography, and grading.
Organize a common metallographic material for factory laboratories today - corrosive fluid quick check sheet
Beginners can directly compare and choose without double-checking the information!
1. The principle of acidification: strictly follow the principle of "slowly pouring acid into water", prohibit the pouring of concentrated acid in water to prevent splash burns
2. Control of high-risk reagents: Wang Shui, hydrofluoric acid, concentrated nitric acid must be operated in the fume hood, wear acid and alkali resistant gloves, goggles
3. Reagent storage: picric acid solution only, light-proof seal; hydrogen peroxide and ammonia are currently used, and cannot be kept for a long time.
4. Waste liquid treatment: acidic, alkaline, fluorine-containing waste liquid is collected separately, and direct dumping is strictly prohibited.
There is no "universal formula" for metallurgical corrosion. Different materials, different heat treatment states, and suitable corrosion solutions and corrosion times are completely different. Only by selecting the right corrosion solution and controlling the operation details can clear and standard metallographic structure pictures be taken, so that the test results are accurate and reliable.
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