Chromalizing device and process for small hole of driving device for control rod of nuclear reactor

A driving device and nuclear reactor technology, applied in the direction of electrodes, cells, electrolysis process, etc., can solve the problems of excessive growth of coating, difficulty in controlling the uniformity of coating thickness, and easy initiation of cracks, etc.

Inactive Publication Date: 2013-05-15
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the radius of such small holes is small, especially the radius of the φ9.54mm small hole is not more than 5mm, and

Method used

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  • Chromalizing device and process for small hole of driving device for control rod of nuclear reactor
  • Chromalizing device and process for small hole of driving device for control rod of nuclear reactor

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Embodiment Construction

[0027] Such as figure 1 As shown, the present invention is a chrome-plating device for small holes of a nuclear reactor control rod driving device, including an anode 2 and an auxiliary cathode 6 . In order to realize the purpose of uniform axial growth of the coating in the present invention, the auxiliary cathode 6 is in the shape of a sheet and is arranged to cover both ends of the small hole, and the auxiliary cathode 6 is connected with a power line at the suction end. The anode 2 is a Pt anode whose outer diameter is 1 / 4 to 1 / 3 of the inner diameter of the small hole; There is a radial gap between them.

[0028] The two ends of the anode 2 exposed on the outside of the small hole are covered with an anode insulating sleeve 7. The anode insulating sleeve 7 is in the shape of a sleeve with an opening at one end and an end cap at the other end. The opening end of the anode insulating sleeve 7 covers the outer end surface of the auxiliary cathode 6. set up. The end of the...

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Abstract

The invention provides a chromalizing device for a small hole of a driving device for a control rod of a nuclear reactor. The chromalizing device comprises an anode and auxiliary cathodes, wherein the auxiliary cathodes are shaped like sheets and arranged by covering the two ends of the small hole; the anode is of a cylindrical body arranged along the axial direction of the small hole and penetrates through the end surfaces of the auxiliary cathodes, and radial gaps are arranged between the anode and the auxiliary cathodes; and anode insulation sleeves are sheathed at the parts at the two ends of the anode, which are exposed on the outer side of the small hole. A preparation process sequentially comprises the following steps of: (1) performing alkaline cleaning to remove oil and cleaning with B-grade pure water; (2) assembling the chromalizing device; and (3) using an electroplating solution which only comprises CrO3, concentrated H2SO4 and Cr<3+> components to chromalize the small hole. The thickness of a plated layer prepared by adopting the method is at least not less than 45mu m; the deviation of the axle center of the plated layer after plating does not exceed 10mu m; and the plated layer has no micro-cracks and can meet the using requirements of working conditions and ensure the effective operation of the driving device for the nuclear control rod.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a chrome-plating device and a process for small holes of a nuclear reactor control rod driving device. Background technique [0002] In the nuclear control rod driving device, many parts contain small holes and the sizes of the small holes are different, such as φ9.54mm, φ12mm, φ61.35mm, φ65.41mm, but each small hole needs to be chrome-plated and the plating requirements are the same: namely The thickness of the coating shall be at least 45 μm; the axial center of the coating shall not deviate more than 10 μm in the radial direction after plating; the coating shall have no microcracks. However, the radius of such small holes is small, especially the radius of the φ9.54mm small hole is not more than 5mm, and the distance between the cathode and the anode is very close during the plating process. Fast, very easy to initiate cracks. [0003] Therefore, in order to control the grow...

Claims

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Application Information

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IPC IPC(8): C25D7/04C25D17/12C25D3/04C25D21/02
Inventor 师攀科王焱周科陈瑞芳张道军姜英林亮文明娄霞
Owner DONGFANG TURBINE CO LTD
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