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Corrosive for showing white layer of processed surface of nickel-base superalloy as well as preparation method and applications thereof

A nickel-based high-temperature alloy, processed technology, applied in the field of metallographic electrolytic corrosion, can solve the problems such as the inability to observe and measure the thickness of the white layer, and achieve the effects of observation and measurement, good corrosion effect, and simple formula

Inactive Publication Date: 2012-06-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The white layer structure on the processed surface of the nickel-based superalloy can hardly be seen from the photos, and the thickness of the white layer on the processed surface cannot be observed and measured

Method used

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  • Corrosive for showing white layer of processed surface of nickel-base superalloy as well as preparation method and applications thereof
  • Corrosive for showing white layer of processed surface of nickel-base superalloy as well as preparation method and applications thereof
  • Corrosive for showing white layer of processed surface of nickel-base superalloy as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First put 70ml of hydrochloric acid in the glass container of the electrolytic corrosion instrument, then add 8ml of nitric acid, 12ml of hydrofluoric acid, 5ml of sulfuric acid and 20g of copper sulfate, stir evenly with a glass rod during the addition process, and prepare the etchant.

[0019] Process and polish the workpiece sample of nickel-based superalloy FGH95, the specific steps are:

[0020] 1. Wire-cut the workpiece sample of nickel-based superalloy FGH95 to obtain a cross-sectional sample of the processed surface;

[0021] 2. Use 400#, 800# water sandpaper to polish on the automatic polishing machine in turn;

[0022] 3. Use polishing flannelette to polish on the automatic polishing machine, and add appropriate amount of metallographic polishing agent during the polishing process to improve the polishing effect of the sample.

[0023] Adjust the current of the electrolytic corrosion instrument to 0.45A, adjust the voltage to 1.5V, and set the electrolytic co...

Embodiment 2

[0026] First put 73ml of hydrochloric acid in the glass container of the electrolytic corrosion instrument, then add 9ml of nitric acid, 15ml of hydrofluoric acid, 4ml of sulfuric acid, and 15g of copper sulfate. During the addition process, use a glass rod to stir evenly to prepare the etchant.

[0027] Adjust the current of the electrolytic corrosion instrument to 0.47A, adjust the voltage to 1.8V, and set the electrolytic corrosion time to 35 seconds. Connect the nickel-based superalloy GH4169 workpiece sample mechanically polished according to the method of Example 1 to the anode of the electrolytic corrosion instrument, and immerse it together with the stainless steel cathode in the corrosive agent, and pay attention that the sample and the cathode cannot be in contact. Then turn on the power, and the electrolytic corrosion ends after 35 seconds. The sample is taken out from the etchant, rinsed repeatedly with alcohol, and then dried with a hair dryer. Thus, a desired obs...

Embodiment 3

[0030] First put 75ml of hydrochloric acid in the glass container of the electrolytic corrosion instrument, then add 10ml of nitric acid, 10ml of hydrofluoric acid, 3ml of sulfuric acid, and 10g of copper sulfate. During the addition process, use a glass rod to stir evenly to prepare the etchant.

[0031] Adjust the current of the electrolytic corrosion instrument to 0.5A, adjust the voltage to 2V, and set the electrolytic corrosion time to 30 seconds. Connect the nickel-based superalloy GH4169 workpiece sample mechanically polished according to the method of Example 1 to the anode of the electrolytic corrosion instrument, and immerse it together with the stainless steel cathode in the corrosive agent, and pay attention that the sample and the cathode cannot be in contact. Then turn on the power, and the electrolytic corrosion ends after 30 seconds. The sample is taken out from the etchant, rinsed repeatedly with alcohol, and then dried with a hair dryer. Thus, a desired obser...

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Abstract

The invention provides a corrosive for showing a white layer of the processed surface of nickel-base superalloy as well as a preparation method thereof. The corrosive comprises 70-75ml of hydrochloric acid, 8-10ml of nitric acid, 10-15ml of hydrofluoric acid, 3-5ml of sulfuric acid and 10-20g of copper sulfate. The preparation method is as follows: putting the hydrochloric acid into a glass container, then adding the nitric acid, the hydrofluoric acid, the sulfuric acid and the copper sulfate in sequence, and finally stirring the mixture uniformly. The corrosive is added into an electrolytic corrosion instrument, the anode of the electrolytic corrosion instrument is conducted with a corroded nickel-base superalloy workpiece with the processed surface, the cathode, the workpiece and the anode are dipped into the corrosive, and the electrolytic corrosion parameters are as follows: the voltage is 1.5V-2V, the current is 0.45A-0.5A, and the corrosion time is 30-40seconds. According to theinvention, the textures of the white layer on the processed surface of the nickel-base superalloy can be shown clearly, the boundary line between the textures of the white layer and the texture of a base body of the processed surface can be distinguished easily, and the observation and the measurement of the white layer on the processed surface of the nickel-base superalloy can be well facilitated.

Description

technical field [0001] The invention relates to an etchant for displaying a white layer on the processed surface of a nickel-based superalloy, a corrosion method and application thereof, and belongs to the technical field of metallographic electrolytic corrosion. Background technique [0002] Nickel-based superalloys are difficult-to-machine materials, and a metamorphic layer will appear on the cutting surface. After corrosion, it will appear white (white layer) under optical microscope observation. The structure of this layer is different from that of the superalloy matrix, and has no obvious structural characteristics. Due to the strong corrosion resistance of nickel-based superalloys, this characteristic brings a lot of inconvenience to the metallographic observation work, especially when observing the white layer structure of the processed surface of nickel-based superalloys, the use of conventional corrosive agents can only obtain the matrix The microstructure of the mi...

Claims

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Application Information

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IPC IPC(8): G01N1/32C25F3/02
Inventor 刘战强杜劲刘子夜
Owner SHANDONG UNIV
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