Brass dezincification-resistance sample preparation method

A technology for sample preparation and resistance to dezincification, applied in the preparation of test samples, etc., can solve the problems of chamfering and peeling of the dezincification layer, and the experimental results are easy to cause large errors, so as to prevent precipitation, and the depth is clearly visible. Effect

Active Publication Date: 2013-04-24
上海宝冶工程技术有限公司
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Problems solved by technology

[0004] In the above experiment process, during the preparation of the metallographic sample of the slice, because the brass sample is located at the edge of the inlaid resin, it is easy to form chamfering and peeling of the dezincification layer during the grinding and polishing process. The result is prone to large errors

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  • Brass dezincification-resistance sample preparation method
  • Brass dezincification-resistance sample preparation method
  • Brass dezincification-resistance sample preparation method

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preparation example Construction

[0032] A method for preparing a brass anti-dezincification sample, the specific steps of the brass anti-dezincification sample preparation method are:

[0033] 11. Inlay the brass sample to be tested, after grinding and polishing, in CuCl at 75°C 2 2H 2 Corrosion in O solution for 24 hours;

[0034] 12. Cut the brass sample to be tested perpendicular to the corroded surface after corrosion to obtain two slices, and use absolute ethanol to clean the section of any slice and the corroded surface;

[0035] 13. Coat the cleaned corrosion surface with glue as a protective layer, and the protective layer must be in full contact with the surface of the brass sample;

[0036] 14. Inlay the sliced ​​surface with resin;

[0037] 15. Polish the inlaid section surface with metallographic sandpaper;

[0038] 16. Put the polished section surface on a polishing machine for polishing;

[0039] 17. Corrode the polished section surface for 20-50 seconds in a solution composed of 1g-3g ferr...

Embodiment 1

[0049] According to the AS2345-2006 standard, after the brass sample to be tested was inlaid according to the standard, after being ground and polished, it was heated in CuCl at 75°C. 2 2H 2 O solution for 24 hours corrosion test. After the corrosion experiment is completed, slice (perpendicular to the exposed surface of the specimen) and then perform the following procedures on the slice:

[0050] (1) Polish the sliced ​​samples sequentially through metallographic sandpaper of 600 mesh, 800 mesh, 1000 mesh, and 1500 mesh. The force direction is parallel to the horizontal plane; (2) Put the polished sample on a polishing machine to polish, and then use 5μm, 2.5μm, 0.25μm diamond polishing liquid to polish in sequence, each process is about 25s; (3) After polishing The sample was corroded in ferric chloride (2g) hydrochloric acid (10ml) alcohol (100ml) solution for about 30s, placed under a metallographic microscope to observe and measure the thickness of the dezincified laye...

Embodiment 2

[0053] According to the AS2345-2006 standard, after the sample was inlaid according to the standard, after grinding and polishing, it was placed in CuCl at 75°C 2 2H 2 O solution for 24 hours corrosion test. After the corrosion experiment is completed, a series of procedures are carried out:

[0054](1) Slice the sample after the corrosion experiment, and clean the corroded surface and the sliced ​​surface of the sample with absolute ethanol; (2) Use the cold mounting method to mix the mounting powder and the mounting liquid at a volume ratio of 5:2 Mix the mosaic resin, place the sliced ​​surface on the bottom of the mold, pour the mixed mosaic resin into the mold, and apply a pressure of 2.0 Bar, wait for 20 to 30 minutes, demould and take out the sample; (3) After the mosaic The sample is polished by metallographic sandpaper of 600 mesh, 800 mesh, 1000 mesh, and 1500 mesh. Each process is subject to the elimination of the previous grinding mark. Each process is about 20s,...

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Abstract

The invention discloses a brass dezincification-resistance sample preparation method. The method comprises the following steps: inlaying a brass sample to be tested, grinding, polishing, and corroding in a 75DEG C CuCl2.2H2O solution for 24h; slicing the corroded brass sample to be tested, and corroding and cleaning the surface of the obtained slice with anhydrous ethanol; coating the cleaned slice surface with a glue to form a protection layer, wherein the protection layer fully contacts with the brass sample surface; carrying out resin inlaying of the slice surface; grinding the inlaid slice surface with metallographic sandpaper; polishing the ground slice surface on a polishing machine; and corroding the polished slice surface in a solution composed of 1-3g of ferric trichloride, 10-20ml of hydrochloric acid and 80-150ml of alcohol. The preparation method solves the dezincification layer chamfering and spalling problems, effectively prevent the water stain from appearing, and makes the dezincification layer depth be clear; and the concentrations and the proportions of the above corrosion solutions are adjusted to improve the corrosion effect in order to make the dezincification layer depth be clearly displayed in the corrosion state.

Description

technical field [0001] The invention relates to a preparation technology of a brass anti-dezincification sample, in particular to a preparation method of a brass anti-dezincification sample. Background technique [0002] Brass parts are widely used in life, such as water tank belts, water supply and drainage pipes, corrugated pipes, serpentine pipes, condenser pipes, bullet casings, and various punched products with complex shapes, small hardware, etc. Because the environment where the parts are located is easy to contact with corrosive media, there are certain requirements for the corrosion resistance of brass parts. Therefore, it is necessary to test the dezincification corrosion resistance of the product before use. Dezincification often occurs in α brass with high zinc content, especially α+β brass. The potential of the zinc electrode is much lower than that of copper. The zinc with low electrode potential is first dissolved in the neutral saline solution, and the coppe...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32
Inventor 钱锟张立华韩波阳刚冯凌超徐登波
Owner 上海宝冶工程技术有限公司
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