Low-temperature oil casing steel surface pack cementation aluminizing technique

An oil casing, embedding and infiltration technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of difficult to control performance stability, reduce the types of infiltration agents, and complex changes in content. The effect of reducing the activation energy of the reaction, lowering the aluminizing temperature and improving the corrosion resistance

Inactive Publication Date: 2010-07-14
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0006] The present invention provides a low-temperature embedding aluminizing process on the surface of oil casing steel, which overcomes the problems of complex changes in the type and content of the infiltration agent, difficult control of performance stability, and high cost in the aluminization technology by changing the infiltration agent.

Method used

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  • Low-temperature oil casing steel surface pack cementation aluminizing technique
  • Low-temperature oil casing steel surface pack cementation aluminizing technique
  • Low-temperature oil casing steel surface pack cementation aluminizing technique

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Embodiment 2

[0023] In embodiment 2: the penetrant composition and content (mass percentage) are metal source Al powder (20%, 150 orders), Zn powder (14%, 150 orders), activator NH 4 Cl (3%), filler Al 2 o 3 (63%, 150 mesh); aluminizing process parameters (aluminizing temperature, time) are: 450 ° C × 8h.

Embodiment 3

[0024] In embodiment 3: the penetrant composition and content (mass percentage) are metal source Al powder (20%, 150 orders), Zn powder (14%, 150 orders), activator NH 4 Cl (5%), filler Al 2 o 3 (61%, 150 mesh); aluminizing process parameters (aluminizing temperature, time) are: 380°C×10h.

[0025] 2. Effect of low temperature aluminizing treatment:

[0026] Using the above-mentioned low-temperature embedding aluminizing process to treat casing steel N80, an aluminized layer with a thickness of 50-90 μm can be obtained, which is basically the same as the thickness of the nano-sized surface layer. The zigzag combination is firm and the distribution is continuous, and the Al element is distributed in a gradient at the interface between the substrate surface and the infiltrated layer. After aluminized oil casing steel was continuously corroded in 3.5% NaCl solution for 24 hours, the corrosion morphology was uniform without obvious localized corrosion (see attached figure 1 )....

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Abstract

The invention relates to a metal surface aluminizing technique, in particular to a low-temperature oil casing steel surface pack cementation aluminizing technique. The invention at least solves the following problems that: the complex change of the variety and content of aluminizing agent in the aluminizing technique needs to be reduced by changing aluminizing agent, the property stability can hardly be controlled, and the cost is high. The adopted technical scheme is as follows: the low-temperature oil casing steel surface pack cementation aluminizing technique sequentially includes the following steps that: the surface nanocrystallization of an oil casing steel sample: a SNC-2 metal surface nanocrystallization tester is utilized to nanocrystallize the surface of the oil casing steel sample in order to obtain a nano-structured surface layer with the thickness of 50Mu m to 90Mu m; the aluminization of the surface-nanocrystallized oil casing steel sample: aluminizing process parameters are as follows: the aluminizing temperature is 380 DEG C to 500 DEG C, and the aluminizing time is 6 hours to 10 hours; and the composition and content of the aluminizing agent are as follows: Al powder as metal source, Zn powder, NH4CL as activating agent and Al2O3 as filler. The aluminizing temperature is low; the variety of aluminizing agent is simple, the content can be easily controlled, and the process stability is high; and the effect is good.

Description

technical field [0001] The invention relates to a metal surface aluminizing process, in particular to a low-temperature embedding aluminizing process on the surface of oil casing steel. Background technique [0002] Oil casing is one of the main materials used in petroleum exploration and development. The oil and gas industry requires a large number of high-quality casings (steel pipes) of different specifications, and casing costs account for 25-35% of the total cost of well construction. With the development of oilfields and offshore oilfields in western my country and the exploitation of deep wells and ultra-deep wells, CO 2 、H 2 The rapid general corrosion and severe local corrosion caused by S lead to early corrosion failure of pipelines and equipment, resulting in huge economic losses. Therefore, it is of great significance to explore cost-effective oil casing steel anticorrosion technology. [0003] Aluminizing technology refers to that under certain conditions, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/50C23C10/02
Inventor 黄敏王宇
Owner XI'AN PETROLEUM UNIVERSITY
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