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Nickel plating method for stainless steel strips

A technology of stainless steel and strips, which is applied in the field of nuclear power fuel elements and its manufacturing, to achieve the effect of good bonding force, good assembly performance, and meeting the requirements of technical indicators

Inactive Publication Date: 2017-03-22
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no research on strip nickel plating technology in my country

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  • Nickel plating method for stainless steel strips

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Effect test

Embodiment 1

[0021] A kind of nickel plating method of stainless steel strip according to the present invention, strip is as figure 1 As shown, it includes the following steps:

[0022] (1) Degreasing: the strip is placed in a degreasing solution to remove the oil on the surface of the strip; the degreasing solution uses an alkaline cleaning agent; the degreasing time is 3 minutes, and the temperature is 70 ° C;

[0023] The alkaline cleaning agent is a mixture solution of sodium hydroxide, sodium phosphate and sodium carbonate, with a concentration of 15g / L;

[0024] (2) Pre-etching: the strip pre-etching after step (1) degreasing removes the Cr on the strip surface 2 o 3 Passivation film; the pre-etching solution is a mixed solution of nitric acid and hydrofluoric acid;

[0025] The pre-etching solution is a mixed solution of 50wt% hydrofluoric acid solution, 68wt% nitric acid solution and deionized water. The volume percentage of 50wt% hydrofluoric acid solution in the mixed solution...

Embodiment 2

[0035] A kind of nickel-plating method of stainless steel strip of the present invention, it comprises the steps:

[0036] (1) degreasing: the strip is placed in a degreasing solution to remove the oil on the surface of the strip;

[0037] The degreasing solution uses an alkaline cleaning agent; the degreasing time is 2 minutes, and the temperature is 80° C.; the alkaline cleaning agent is sodium hydroxide solution, and the concentration is 10 g / L;

[0038] (2) Pre-etching: the strip pre-etching after step (1) degreasing removes the Cr on the strip surface 2 o 3 Passivation film; the pre-etching solution is a mixed solution of nitric acid and hydrofluoric acid;

[0039]The pre-etching solution is a mixed solution of 45wt% hydrofluoric acid solution, 67wt% nitric acid solution, and deionized water. The volume percentage of the 45wt% hydrofluoric acid solution in the mixed solution is 10vol%, and the volume percentage of the 67wt% nitric acid solution is 60vol. %, the rest is...

Embodiment 3

[0049] A kind of nickel-plating method of stainless steel strip of the present invention, it comprises the steps:

[0050] (1) Degreasing: the strip is placed in a degreasing solution to remove the oil on the surface of the strip; the degreasing solution uses an alkaline cleaning agent; the degreasing time is 5 minutes, and the temperature is 60 ° C;

[0051] (2) Pre-etching: the strip pre-etching after step (1) degreasing removes the Cr on the strip surface 2 o 3 Passivation film; the pre-etching solution is a mixed solution of nitric acid and hydrofluoric acid;

[0052] The pre-etching solution is a mixed solution of 55wt% hydrofluoric acid solution, 70wt% nitric acid solution, and deionized water. The volume percentage of the 55wt% hydrofluoric acid solution in the mixed solution is 6vol%, and the volume percentage of the 70wt% nitric acid solution is 40vol. %, the rest is deionized water; the pre-etching temperature is 35 degrees, and the time is 2 minutes.

[0053] (3)...

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Abstract

The invention provides a nickel plating method for stainless steel strips. The method includes the steps of 1, degreasing; 2, pre-etching; 3, alkali washing; 4, etching; 5, nickel flash plating; and 6, nickel plating. In the step 1, the strips are placed into degreasing solutions for 2-5 minutes to remove greasy dirt on the surfaces of the strips; in the step 2, the degreased strips are pre-etched to remove Cr2O3 passivation films on the surfaces of the strips; in the step 3, alkali washing is carried out on the strips to neutralize pre-etching solutions; in the step 4, the strips are etched so that the surfaces of the strips can have certain microscopic roughness; in the step 5, nickel flash plating is carried out on the obtained strips for 1.5-2.5 minutes so that thin nickel layers can be deposited on the strips in a short time; and in the step 6, nickel plating is carried out on the strips so that the strips can have good wettability in the brazing process. According to the method, the nickel layers with the attractive appearances, the good binding force and the uniform thickness are deposited on the surfaces of the strips, and therefore the flowability of brazing filler metal is better in the subsequent brazing process of the strips and the brazing effect is improved.

Description

technical field [0001] The invention relates to the technical field of nuclear power fuel elements and their manufacture, in particular to a nickel plating method for stainless steel strips. Background technique [0002] Ribbons are an important part of nuclear fuel element grids, such as figure 1 As shown, the grid is one of the main components constituting the skeleton of the fuel assembly. Its main function is to clamp the fuel rods, so that the fuel rods are arranged in the most suitable position to meet the requirements of optimal nuclear energy, heat, machinery and hydraulic power in the core. The grid is made of strips of stainless steel (mainly nickel- and chromium-containing stainless steel such as Inconel 718) of different shapes after assembly and welding. Before welding, a uniform and complete nickel layer needs to be plated on the surface of the strips. The role is to meet the brazing requirements of the grid, so that the solder has better fluidity during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/14C25D5/16C25D5/36C25D3/12C23F1/28C25F3/06
CPCC23F1/28C25D3/12C25D5/14C25D5/16C25D5/36C25F3/06
Inventor 王志斌朱振平华旭杨勇房向晖
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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