Corrosion prevention technique of aluminum zinc rare earth alloying for oil pipe

A technology of rare earth alloy and oil pipe, which is applied in metal material coating process, pipeline anti-corrosion/rust protection, hot-dip plating process, etc. It can solve the problems of poor anti-corrosion effect and achieve strong adhesion and good corrosion resistance.

Inactive Publication Date: 2005-01-12
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the poor anti-corrosion effect of existing oil pipes, the present invention provides a zinc-aluminum rare-earth alloy anti-corrosion process for oil pipes. Tubing consumption

Method used

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  • Corrosion prevention technique of aluminum zinc rare earth alloying for oil pipe
  • Corrosion prevention technique of aluminum zinc rare earth alloying for oil pipe
  • Corrosion prevention technique of aluminum zinc rare earth alloying for oil pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1: After degreasing, water washing and pickling, the oil pipe use composition is ZnCl 2 160 g / L, NH 4 Cl is 70 grams per liter of crossing liquid for treatment, and then enters a 430°C built-in zinc pot with a liquid rare earth zinc-aluminum alloy with a rare earth content of 0.06% and an aluminum content of 0.03% for coating treatment. After 3 minutes of immersion plating, the Lift the oil pipe out of the zinc liquid at a lifting speed of 3-4cm / s, cool it in the air, passivate it with sodium dichromate and nitric acid, and wash it with water after passivation. The method of adding aluminum in the above-mentioned zinc-aluminum rare earth alloy plating solution: put 0 in the zinc pot # Heat the zinc to 460°C. After the zinc liquid is completely melted, add aluminum into the zinc liquid. After the aluminum is completely melted, keep it warm for 1 hour; the addition of rare earth in the zinc-aluminum rare earth alloy plating solution adopts the method of smelti...

Embodiment 2

[0043] Embodiment 2: After degreasing, washing and pickling, the oil pipe use composition is ZnCl 2 150 g / L, NH 4 Cl is 60 g / L of the aiding solution for treatment, and then enters the zinc-based plating bath of liquid rare earth zinc-aluminum alloy with a rare earth content of 0.05% and an aluminum content of 0.04% built-in at 440°C for plating treatment, plating for 4 minutes Finally, lift the oil pipe out of the zinc liquid at a lifting speed of 3-4cm / s, cool it in the air, passivate it with sodium dichromate and nitric acid, and wash it with water after passivation. The above-mentioned adding method of aluminum in the above-mentioned zinc-aluminum rare earth alloy plating solution: put 0 in the zinc pot # Heat the zinc to 460°C. After the zinc liquid is completely melted, add aluminum into the zinc liquid. After the aluminum is completely melted, keep it warm for 1 hour; the addition of rare earth in the zinc-aluminum rare earth alloy plating solution adopts the method of...

Embodiment 3

[0044] Example 3, the composition of the oil pipe after degreasing, water washing and pickling is ZnCl 2 170 g / L, NH 4 Cl is 50 grams per liter of the aiding solution for treatment, and then enters a zinc-based plating bath with a liquid rare earth zinc-aluminum alloy with a rare earth content of 0.04% and an aluminum content of 0.02% at 435 ° C for plating treatment, plating for 5 minutes Finally, lift the oil pipe out of the zinc liquid at a lifting speed of 3-4cm / s, cool it in the air, passivate it with sodium dichromate and nitric acid, and wash it with water after passivation. The above-mentioned adding method of aluminum in the above-mentioned zinc-aluminum rare earth alloy plating solution: put 0 in the zinc pot # Heat the zinc to 460°C. After the zinc liquid is completely melted, add aluminum into the zinc liquid. After the aluminum is completely melted, keep it warm for 1 hour; the addition of rare earth in the zinc-aluminum rare earth alloy plating solution adopts t...

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Abstract

This invention relates to ZnAl rare earth alloy antiseptic technology mainly solving the problem of poor antiseptic results of current or / tubs characterizing including the following steps: the inside and outside wall surfaces of the oil tube are de-fat, washed, washed with acid and processed with coating aid to be put into a Zn solution tank containing liquid ZnAl rare earth alloy under 430deg.C-440deg.C to be coated and taken out to be passivated with heavy sodium chromate and HNo3 and washed, said liquid alloy applies alloying method in smelting.

Description

Technical field: [0001] The invention relates to an anticorrosion process for oil pipes in the field of oil field exploitation, and belongs to a zinc-aluminum rare earth alloy anticorrosion process for oil pipes. Background technique: [0002] Daqing Oilfield is a waterflood development oilfield, and the corrosion of oil pipes in water injection wells is very serious. At present, the commonly used anti-corrosion methods for oil pipes used in oil fields are as follows: one is the nickel-phosphorus plating method. The oil pipe coating layer of this anti-corrosion method is very thin. Because the coating layer is thin and does not meet the technical indicators, there must be pinholes, and because the coating layer is cathodic. A large cathode and a small anode reaction appear at the pinhole, which accelerates the corrosion of the oil pipe; the second is the organic coating and epoxy powder thermosetting coating method. This method has a thick coating and a dense thermosetting c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C22/24F16L58/08
Inventor 吴成龙赵晓光刘大全
Owner DAQING OILFIELD CO LTD
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