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Method for preparing nickel base alloy surface composite plating

A nickel-based alloy and surface composite technology, applied in the field of electrodeposition, can solve problems such as the inability to guarantee the quality of the surface coating, and achieve the effect of ensuring performance

Active Publication Date: 2009-04-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of sour oil and gas fields, the requirements for corrosion resistance of materials are getting higher and higher, and nickel-based alloy oil casing products suitable for high corrosion resistance have begun to be applied in batches. Since the alloy content reaches about 80%, traditional coatings are used. method, the quality of the surface coating can no longer be guaranteed, and a new coating process must be used for surface treatment to ensure the anti-adhesion performance requirements of nickel-based alloy oil casing products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of electrodeposition on N06985 (C≤0.015%; Cr: 21-23.5%; Ni: 46-50%; Mo: 6-8%: Cu: 1.5-2.5%; Fe: 18-21%) nickel-based alloy Copper-tin alloy nano-plating.

[0039] Step 1, put the nickel-based alloy coupling into the alkaline degreasing agent for degreasing. The composition of the alkaline degreasing agent is as follows:

[0040] Trisodium Phosphate 50g / L, Sodium Carbonate 25g / L, Sodium Hydroxide 10g / L, Sodium Silicate 15g / L, Fatty Alcohol Polyoxyethylene Ether 2g / L, the temperature is 70℃, the time is until the grease is removed; wash with water ;

[0041] The second step is to activate in hydrochloric acid to pre-remove the passivation film on the surface of the nickel-based alloy. The concentration of hydrochloric acid is 36%, and the activation time is 4 minutes;

[0042] The third step is to activate and cathode electrodeposit nickel in a solution containing nickel chloride and hydrochloric acid at room temperature. The activation time is 2min, the co...

Embodiment 2

[0047] Preparation of electrodeposition on N06985 (C≤0.015%; Cr: 21-23.5%; Ni: 46-50%; Mo: 6-8%: Cu: 1.5-2.5%; Fe: 18-21%) nickel-based alloy Copper-tin alloy nano-plating.

[0048] Step 1, put the nickel-based alloy coupling into the alkaline degreasing agent for degreasing. The composition of the alkaline degreasing agent is as follows:

[0049] Trisodium Phosphate 35g / L, Sodium Carbonate 22g / L, Sodium Hydroxide 6g / L, Sodium Silicate 11g / L, Fatty Alcohol Polyoxyethylene Ether 3g / L, the temperature is 65℃, the time is until the grease is removed; wash with water ;

[0050] The second step is to activate in hydrochloric acid to pre-remove the passivation film on the surface of the nickel-based alloy. The concentration of hydrochloric acid is 25%, and the activation time is 2 minutes;

[0051]Step 3, at room temperature, activate and cathode electrodeposit nickel in a solution containing nickel chloride and hydrochloric acid; The density is 9A / dm 2 , the time is 2min, the a...

Embodiment 3

[0056] Preparation of electrodeposition on N06985 (C≤0.015%; Cr: 21-23.5%; Ni: 46-50%; Mo: 6-8%: Cu: 1.5-2.5%; Fe: 18-21%) nickel-based alloy Copper-tin alloy nano-plating.

[0057] Step 1, put the nickel-based alloy coupling into the alkaline degreasing agent for degreasing. The composition of the alkaline degreasing agent is as follows:

[0058] Trisodium phosphate 65g / L, sodium carbonate 20g / L, sodium hydroxide 15g / L, sodium silicate 20g / L, fatty alcohol polyoxyethylene ether 2.5g / L, the temperature is 85°C, and the time is until the oil is removed; wash;

[0059] The second step is to activate in hydrochloric acid to pre-remove the passivation film on the surface of the nickel-based alloy, the concentration of hydrochloric acid is 30%, and the activation time is 9 minutes;

[0060] Step 3, at room temperature, activate and cathode electrodeposit nickel in a solution containing nickel chloride and hydrochloric acid; the activation time is 3min, the nickel chloride content...

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PUM

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Abstract

The invention relates to a preparation method of a composite plating layer used on the surface of nickel-based alloy, which comprises the following steps: 1) degreasing is carried out; 2) water washing is carried out; 3) acid washing is carried out; a passive film on the surface is pre-removed; activation in hydrochloric acid is carried out; the passive film on the surface of the nickel-based alloy is pre-removed; the concentration of the hydrochloric acid is 20 percent to 36 percent; and the time for activation is 1min to 10min; 4) the removal of the passive film on the surface and the pre-plating of nickel are carried out; activation in a solution containing nickel dichloride and the hydrochloric acid and the cathode electro-deposition of the nickel are carried out; time for activation is 1min to 4min; the content of the nickel dichloride is 120g / l to 480g / l; the content of the hydrochloric acid with the concentration of 20 percent to 36 percent is 60ml / l to 350ml / l; current density is 1A / dm<2> to 10A / dm<2>; and the thickness of a nickel plating layer is less than or equal to 0.1 micron; 5) water washing is carried out; and 6) nano copper-tin is prepared; an electro-deposition method is applied to prepare a nano copper-tin plating layer on the coupling surface of a nickel-based alloy oil bushing. The preparation method carries out the pre-plating of nickel on the coupling surface of the nickel-based alloy oil bushing at first and then plates a copper-tin alloy, thereby improving the anti-sticking performance of a connector of the oil bushing and meeting the requirement for completeness of the oil bushing in the aspect of screwing on and screwing off repeatedly.

Description

technical field [0001] The invention belongs to the technical field of electrodeposition, in particular to a method for preparing a composite coating on the surface of a nickel-based alloy. Background technique [0002] Oil casing is a product that must be used in the exploration and development of oil and gas fields. A single oil casing is connected by threads into a pipe string that can withstand various loads of several thousand meters. One of the quality indicators of the connection thread is to ensure repeated loading and unloading. There is no adhesive failure in buckle thread. The oil-casing joint is composed of internal threads and external threads. During use, the thread is tightened and loosened by making up and breaking out. The threaded joint is equivalent to a pair of friction pairs. When the surfaces of the internal thread and the external thread contact each other, the microscopic From the point of view, the actual contact area of ​​the two contact bodies is ...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D5/24
Inventor 王琍张忠铧马刘宝孙元宁
Owner BAOSHAN IRON & STEEL CO LTD
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