Corrosion-resistant and high-temperature-resistant sacrificial anode material and preparation method thereof

A sacrificial anode and high temperature resistant technology, applied in the field of sacrificial anode materials and their preparation, can solve the problems of uneven surface dissolution of sacrificial anodes, low current efficiency of sacrificial anodes, easy diameter reduction and breakage, etc. Improves corrosion conditions and promotes uniform distribution

Active Publication Date: 2021-01-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the dissolution is uneven, the sacrificial anode is easy to shrink and break off, and falls to the bottom of the wellbore of the oil and gas well to block the oil-water flow channel
When the sacrificial anode materials used in the above-mentioned marine environment and buried environment are applied to the working environment of oil and gas wells, due to the strong corrosiveness of the liquid in the oil and gas wells and the high working temperature, the salinity is generally 50g / L, containing CO2 and sulfate-reducing bacteria (abbreviated as SRB) and other corrosive media, the general temperature is 70 ° C, so the current efficiency of the sacrificial anode is low and the consumption is fast, resulting in uneven dissolution on the surface of the sacrificial anode, and the corrosion products are not easy to fall off

Method used

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  • Corrosion-resistant and high-temperature-resistant sacrificial anode material and preparation method thereof
  • Corrosion-resistant and high-temperature-resistant sacrificial anode material and preparation method thereof
  • Corrosion-resistant and high-temperature-resistant sacrificial anode material and preparation method thereof

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preparation example Construction

[0035] The preparation process of the aluminum alloy sacrificial anode of the present invention comprises the following steps,

[0036] Step 1, smelting Al-Zn-In-Sn-Mg master alloy: adding electrolytic primary aluminum to the resistance furnace to form an aluminum alloy solution, spraying and refining the aluminum alloy solution, and passing argon gas into the aluminum alloy solution for degassing And pull out the oxidation scum on the surface, then add Zn, In, Sn, Mg in proportion, carry out electromagnetic stirring on the aluminum alloy during the melting process, the melting temperature is 760-800 ℃, the time is 0.5-2h, and naturally cool to room temperature.

[0037] Step 2, heating the Al-Zn-In-Sn-Mg master alloy smelted in the first step to 800-820°C, and then adding Al-La master alloy, Al-Y master alloy, and Al-Nd master alloy in proportion, These three alloys are directly purchased from the market, and the mass fractions of La, Y and Nd will be marked, heated to 840-8...

Embodiment 1

[0039] The components of the Al-Zn-In sacrificial anode material of the present invention and their mass percentages are Zn 5%, In 0.05%, Sn 0.1%, Mg 0.8%, La 0.015%, Y 0.02%, Nd 0.01%, Cu 0.006 %, Fe 0.12%, Si 0.06%, and the balance is Al.

[0040] The preparation process includes the following steps,

[0041] Step 1, smelting Al-Mg intermediate alloy: Add electrolytic primary aluminum to the resistance furnace to form an aluminum alloy solution, spray and refine the aluminum alloy solution, pass argon gas into the aluminum alloy solution for degassing and remove the surface oxide floating Slag, and then add Zn, In, Sn, Mg in proportion, electromagnetically stir the aluminum alloy during the smelting process, the smelting temperature is 760°C, the time is 2h, and naturally cool to room temperature after smelting.

[0042] Step 2, heating the Al-Mg master alloy smelted in the first step to 800°C, then adding Al-La master alloy, Al-Y master alloy, and Al-Nd master alloy in pro...

Embodiment 2

[0045] The components of the Al-Zn-In sacrificial anode material of the present invention and their mass percentages are Zn 4.5%, In 0.035%, Sn 0.1%, Mg 1.0%, La 0.01%, Y 0.02%, Nd 0.02%, Cu 0.007% , Fe 0.13%, Si0.08%, and the balance is Al.

[0046] The preparation process includes the following steps,

[0047] Step 1, smelting Al-Mg intermediate alloy: Add electrolytic primary aluminum to the resistance furnace to form an aluminum alloy solution, spray and refine the aluminum alloy solution, pass argon gas into the aluminum alloy solution for degassing and remove the surface oxide floating Slag, and then add Zn, In, Sn, Mg in proportion, electromagnetically stir the aluminum alloy during the smelting process, the smelting temperature is 800°C, the time is 1h, and naturally cool to room temperature after smelting.

[0048] Step 2: Heat the Al-Mg master alloy smelted in the first step to 800°C, then add Al-La master alloy, Al-Y master alloy, and Al-Nd master alloy in proporti...

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Abstract

The invention relates to a corrosion-resistant and high-temperature-resistant sacrificial anode material and a preparation method thereof. The material comprises the following components of, in percentage by mass, 4%-6% of Zn, 0.035%-0.05% of In, 0.04%-0.1% of Sn, 0.3%-1.0% of Mg, 0.01%-0.02% of La, 0.01%-0.02% of Y, 0.01%-0.02% of Nd, less than or equal to 0.26% of impurities and the balance Al.During preparation, electrolytic primary aluminum is molten into an aluminum alloy solution, then blowing, refining, degassing, slag pulling out are conducted, Zn, In, Sn and Mg are added, smelting isconducted at 760-800 DEG C, and then cooling is conducted; heating is conducted to achieve 800-820 DEG C, an Al-La intermediate alloy, an Al-Y intermediate alloy and an Al-Nd intermediate alloy are added, and refining, degassing and slag pulling out are conducted at 840-860 DEG C; and finally, heat preservation is conducted at 700-720 DEG C for 60-80 minutes, and then cooling is conducted to achieve the room temperature.

Description

technical field [0001] The invention relates to the technical field of oil and gas field corrosion and protection, in particular to a corrosion-resistant and high-temperature-resistant sacrificial anode material and a preparation method thereof. Background technique [0002] In the field of oil and gas industry, the exploitation process of oil and gas wells often faces the problem of corrosion of oil and casing. In order to prevent and slow down the corrosion of oil and casing, and ensure the normal and stable production of oil and gas wells, a sacrificial anode pup joint is placed in the wellbore to protect the oil and casing from corrosion. This not only has a good anti-corrosion effect, but also has low cost, management, It is also more convenient to maintain and use, and has broad application prospects. At present, the available sacrificial anodes mainly include aluminum-based alloy sacrificial anodes, magnesium-based alloy sacrificial anodes and zinc-based alloy sacrif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/14C22C1/03C22C21/10
CPCC23F13/14C22C21/10C22C1/026C22C1/03
Inventor 孙雨来李琼玮杨立华董晓焕何淼董俊杨会丽李慧姜毅付彩利
Owner PETROCHINA CO LTD
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