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A kind of pretreatment method of hard chromium plating process on the surface of nuclear stainless steel material

A technology for plating hard chrome and stainless steel, applied in the field of surface treatment of stainless steel materials for nuclear use, can solve the problems of serious pollution, poor surface, good bonding performance between the coating and the substrate, etc., and achieve the effect of obvious effect and uniform coating.

Active Publication Date: 2016-02-03
鹰普航空科技(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the subsequent activation and deposition, the bonding performance between the coating and the substrate appeared. Some surfaces are very good, and some surfaces are very poor.
On the other hand, the passivation film is removed with an acid solution, and the pollution is serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A pretreatment method of the hard chromium plating process on the surface of nuclear stainless steel materials of the present invention comprises the following steps: first blow out the mixed water containing 500 mesh micron-sized silicon dioxide powder with a spray gun with a high-pressure gas of 0.4 MPa, and spray it into the nuclear reactor On the surface of the control rod drive shaft, use the energy obtained by silica powder to remove the oxide film on the surface of the nuclear reactor control rod drive shaft. The spray time is 4 minutes. After the passivation film is completely removed, clean the surface with pure water and install the electroplating rack. Immerse the hanger equipped with the drive shaft of the control rods of the nuclear reactor into the 3 and H 2 SO 4 In the solution hard chromium plating tank, the same position as the hard chromium plating is activated in the same plating tank, the same solution and the same position, and finally the hard chr...

Embodiment 2

[0019] A kind of pretreatment method of hard chromium plating process on the surface of nuclear stainless steel material of the present invention comprises the following steps: first use 0.6MPa high-pressure gas to blow out the mixed water containing 1200 mesh micron-sized silicon dioxide powder with a spray gun, and spray it into the nuclear reactor On the surface of the control rod buffer shaft, use the energy obtained by silica powder to remove the oxide film on the surface of the nuclear reactor control rod buffer shaft. The spray time is 7 minutes. After the passivation film is completely removed, clean the surface with pure water and install electroplating. Hanger, immerse the hanger equipped with the buffer shaft of the nuclear reactor control rod into the 3 and H 2 SO 4 In the solution hard chromium plating tank, the same position as the hard chromium plating is activated in the same plating tank, the same solution and the same position, and finally the hard chromium ...

Embodiment 3

[0021] A kind of pretreatment method of hard chromium plating process on the surface of nuclear stainless steel materials of the present invention comprises the following steps: first blow out the mixed water containing 1500 mesh micron-sized silicon dioxide powder with a spray gun with 0.8MPa high-pressure gas, and spray it into the nuclear reactor The surface of the blasting valve body is used to remove the oxide film on the surface of the nuclear reactor blasting valve body by using the energy obtained by silica powder. The spraying time is 15 minutes. After the passivation film is completely removed, the surface is cleaned with pure water and the electroplating rack is installed. , immerse the hanger equipped with the blasting valve body of the nuclear reactor into the 3 and H 2 SO 4 In the solution hard chromium plating tank, the same position as the hard chromium plating is activated in the same plating tank, the same solution and the same position, and finally the hard...

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PUM

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Abstract

The invention discloses a pretreatment method for a hard chromium plating process on surface of a nuclear stainless steel material. The method is characterized by comprising the following steps of: first, blowing mixed water containing powder by a high pressure gas through a spray gun to the surface of a pre-hard chromium plated part; after completely removing the passivation coating, cleaning the surface by pure water; installing an electroplating hanging tool; soaking the hanging tool provided with the pre-hard chromium plated part to a hard chromium plating groove; activating with the hard plated chromium in a same work station of a same plating groove, same liquor and a same position; and finally performing hard chromium plating. The method provided by the invention has the advantages that the part treated by the pretreatment method is uniform in plating layer on the surface of the part after chromium plating. The plating layer is free from delaminating condition, and the bonding force of the plating layer and the matrix is greater than 50Mpa. The treatment method is in particular very remarkable in pretreatment effect of chromium plating for large nuclear stainless steel parts.

Description

technical field [0001] The invention relates to the field of surface treatment of nuclear stainless steel materials in material processing engineering, in particular to a pretreatment method for the surface hard chrome plating process of nuclear stainless steel materials. Background technique [0002] A country's energy strategy is not only related to whether it can support modern industries and modern people's lives, but also related to national security and territorial integrity. Traditional coal, gas, and oil resources are facing depletion, and new energy sources such as nuclear power, wind power, and solar energy have become the focus of development by developed countries in the world. The degree of development of nuclear power technology reflects the level of the country's high-tech level in a certain sense. In the development of nuclear power technology, the third-generation advanced pressurized water reactor nuclear power plant represents the level of a new generatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/36
Inventor 仇士学李争显樊健东永华蔡宪成张建峰
Owner 鹰普航空科技(南通)有限公司