Nickel-based alloy electrolytic polishing liquid and polishing method thereof

A nickel-based alloy and electrolytic polishing technology, which is applied in the field of electrolytic polishing, can solve the problems of fixed size, unsure composition, and inability to obtain an ideal polished surface, etc., to achieve obvious metallic luster, good appearance, and improved corrosion resistance.

Active Publication Date: 2017-05-10
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The 6 Chinese invention patent "Hastelloy Electrolytic Polishing Process" proposes to use Isopol 140 as the electrolyte, and the parameters of the electrolytic polishing process are: temperature: 50-65°C, voltage: 8-12V, polishing time 60-120s, and titanium wire As the cathode, the area of ​​the plate is 1/3-1/5 of the area of ​​the part. Since the electrolyte is the key process material in electropolishing, and Isopol 140 is a code name, its specific composition cannot be determined, and the voltage is related to the workpiece, The geometric size, distance, and solution temperature of the cathode are all related, therefore, it is impossible to implement this patent to obtain a good electrolytic polishing surface for nickel-based a

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  • Nickel-based alloy electrolytic polishing liquid and polishing method thereof
  • Nickel-based alloy electrolytic polishing liquid and polishing method thereof
  • Nickel-based alloy electrolytic polishing liquid and polishing method thereof

Examples

Experimental program
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Example Embodiment

[0043] Example 1

[0044] For the electrolytic polishing process of the nickel-based alloy sealing plate of the nuclear power reactor core make-up tank, the specific steps are as follows:

[0045] (1) Perform activation pretreatment on the nickel-based alloy electrolytic polishing workpiece to ensure that there is no excess water on the surface of the workpiece; the pretreatment is to remove the surface oil stains on the workpiece with lye, and then put the clean workpiece into a concentration containing hydrogen peroxide 2 5% 5% dilute nitric acid enters the activation for 10 minutes, rinses with tap water after activation, and puts into the electrolytic cell after there is no obvious water flow on the surface of the workpiece.

[0046] (2) The composition of the electrolyte in the electrolytic cell is (in weight percentage): a concentration of 85wt% phosphoric acid 65%, 98wt% sulfuric acid 12%, ammonium thiocyanate 4%, 1,4-butynediol 7%, diacetyl oxime 6%, polyethylene glycol (M=4...

Example

[0049] Examples 2~4

[0050] Using the raw materials and methods of Example 1, the only difference is the composition of the electrolyte in the electrolytic cell. The composition of the electrolyte is shown in Table 1. Other processes and process parameters are the same as in Example 1. Among them, the concentration of nitric acid is 85 wt%, and the concentration of sulfuric acid is 98 wt%.

[0051] The roughness and metallographic inspection results of the polished workpiece are shown in Table 3.

[0052] Table 1 The composition of the electrolyte used in Examples 1 to 4

[0053]

Example

[0054] Examples 5-8

[0055] Using the raw materials and methods of Example 1, the only difference is that the process parameters are different during electrolysis. The detailed process parameters are shown in Table 2. The roughness and metallographic inspection results of the polished workpiece are shown in Table 3.

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Abstract

The invention relates to nickel-based alloy electrolytic polishing liquid and a polishing method thereof and belongs to the technical field of electrolytic polishing. Aiming at solving the technical problems, the invention provides the nickel-based alloy electrolytic polishing liquid. The electrolytic polishing liquid is prepared from the following components in parts by weight: 50-75 parts of phosphoric acid, 8-15 parts of sulfuric acid, 1-5 parts of ammonium thiocyanate, 5-15 parts of 1,4-butynediol, 1-8 parts of dimethylglyoxime, 1-5 parts of polyethylene glycol and 1-3 parts of guar gum. According to the electrolytic polishing liquid, the components are common chemical materials, have low prices and are easy to obtain. A good electrolytic polishing effect is obtained after a nickel-based alloy workpiece is subjected to activation treatment, proper electrolyte and current density are utilized, and different electrolysis time and electrolyte temperatures are selected; the appearance of an electrolytic polished surface of the nickel-based alloy workpiece is good; the surface has obvious metal color and luster and the roughness can reach Ra0.1mum or below. The nickel-based alloy electrolytic polishing liquid has no problems of white points, spots, inter-crystalline corrosion and the like and the corrosion resisting performance of equipment is extremely improved.

Description

technical field [0001] The invention relates to a nickel-based alloy electrolytic polishing liquid and a polishing method thereof, belonging to the technical field of electrolytic polishing. Background technique [0002] Since the 1990s, nickel-based alloys, as a new material with excellent performance, have entered the field of nuclear power plant manufacturing in large quantities, such as steam generators, water tanks and other key equipment in nuclear islands. The important reason for using nickel-based alloys is that in addition to Nickel-based alloy has excellent high temperature resistance, it also has good corrosion resistance. The corrosion resistance is closely related to the surface state of the equipment. Compared with other polishing methods, electrolytic polishing is highly praised by the nuclear power plant design department and users because it can eliminate the residual stress near the surface and provide a small surface roughness. Equipment manufacturers ar...

Claims

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Application Information

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IPC IPC(8): C25F3/22
CPCC25F3/22
Inventor 白敏温皓陈龚
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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