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Low-driving-potential aluminum alloy sacrificial anode for seawater and preparation method thereof

A sacrificial anode and low drive technology, which is applied in the field of corrosion protection of hydrogen embrittlement sensitive material structures, can solve the problems of poor activation performance of aluminum alloy sacrificial anodes, failure to achieve protection effect, uneven distribution, etc., to reduce casting defects , long service life, uniform dissolution improvement effect

Inactive Publication Date: 2019-07-23
SHANDONG DERUI ANTI-CORROSION MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the particularity of the oily seawater environment, the general-purpose aluminum alloy sacrificial anodes, especially the low-potential anodes, have coarse grains, uneven distribution, and often exist a third phase. In addition, the oil in seawater adheres to the surface of the sacrificial anode. The activation performance of the alloy sacrificial anode becomes poor, the dissolution is uneven, the corrosion products are not easy to fall off, and the satisfactory protection effect cannot be achieved. Therefore, it is of great significance to develop a low driving potential aluminum alloy suitable for high efficiency and environmental protection in seawater

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  • Low-driving-potential aluminum alloy sacrificial anode for seawater and preparation method thereof

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Embodiment 1

[0022] A low driving potential aluminum alloy sacrificial anode suitable for seawater, comprising the following raw materials in weight percentage: 85% of aluminum, 2% of zinc, 1% of bismuth, 0.05% of manganese, and 0.02% of gallium.

[0023] The preparation method of the low driving potential aluminum alloy sacrificial anode suitable for seawater comprises the following steps:

[0024] (1) Under the protection of dynamic inert gas, aluminum is added into the smelting furnace, heated and melted to obtain molten aluminum;

[0025] (2) preheat manganese, bismuth, zinc, gallium, remove contained moisture, then drop manganese, bismuth, zinc into aluminum liquid, stir and add gallium after fully dissolving, continue to stir and keep warm for a period of time;

[0026] (3) Casting with a cast steel mold, and quenching the casted product by spraying water to obtain the low driving potential aluminum alloy sacrificial anode suitable for seawater.

Embodiment 2

[0028] A low driving potential aluminum alloy sacrificial anode suitable for seawater, comprising the following raw materials in weight percentage: 85% of aluminum, 2% of zinc, 1% of bismuth, 0.05% of manganese, and 0.02% of gallium.

[0029] The preparation method of the low driving potential aluminum alloy sacrificial anode suitable for seawater comprises the following steps:

[0030] (1) Under the protection of dynamic inert gas nitrogen, aluminum is added into the smelting furnace, heated and melted at a temperature of 730°C to obtain molten aluminum;

[0031] (2) Preheat manganese, bismuth, zinc, and gallium at a temperature of 100°C for 8 minutes to remove the contained water, then put manganese, bismuth, and zinc into the aluminum liquid, stir them with permanent magnetic stirring, and then add gallium , continue to stir and keep warm for 10 minutes;

[0032] (3) Preheat the cast steel mold at a temperature of 300°C for 15 minutes, then cast it with a cast steel mold a...

Embodiment 3

[0034] A low driving potential aluminum alloy sacrificial anode suitable for seawater, comprising the following raw materials in weight percentage: 86% of aluminum, 3% of zinc, 1% of bismuth, 0.06% of manganese, and 0.02% of gallium.

[0035] The preparation method of the low driving potential aluminum alloy sacrificial anode suitable for seawater comprises the following steps:

[0036] (1) Under the protection of dynamic inert gas nitrogen, aluminum is added into the smelting furnace, heated and melted at a temperature of 750°C to obtain molten aluminum;

[0037] (2) Preheat manganese, bismuth, zinc, and gallium at a temperature of 120°C for 9 minutes to remove the contained water, then put manganese, bismuth, and zinc into the aluminum liquid, stir them with permanent magnetic stirring, and then add gallium , continue to stir and keep warm for 12 minutes;

[0038] (3) Preheat the cast steel mold at a temperature of 320°C for 18 minutes, then cast it with a cast steel mold a...

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Abstract

The invention discloses a low-driving-potential aluminum alloy sacrificial anode for seawater and a preparation method thereof. The low-driving-potential aluminum alloy sacrificial anode for the seawater comprises, by weight, 85%-90% of aluminum, 2%-5% of zinc, 1%-3% of bismuth, 0.05%-0.08% of manganese, 0.02%-0.04% of gallium. The low-driving-potential aluminum alloy sacrificial anode for the seawater has the beneficial effects that control over the anode potential negative shifting amount and comprehensive activation of the anode surface are achieved by controlling appropriate microalloyed elements, and then the service life of the aluminum alloy anode is long; in a deep seal environment, the working potential is stable, the dissolution morphology is uniform, the current efficiency is high, and the cathode protecting potential requirements of hydrogen embrittlement sensitive materials such as high-strength steel, stainless steel and titanium alloy can be met; and in addition, the cooling speed is increased through a method of controlling the mold temperature and a water cooling method, alloy grains are refined, casting flaws are reduced, a precipitated phase can be distributed more uniformly by increasing the cooling speed, and the guarantee is improved for uniform dissolution of the sacrificial anode.

Description

technical field [0001] The invention relates to the technical field of corrosion protection of hydrogen embrittlement sensitive material structures, in particular to a low driving potential aluminum alloy sacrificial anode suitable for seawater and a preparation method thereof. Background technique [0002] In recent years, with the development of offshore oil extraction and oil processing industry, the mileage of oil pipelines has increased rapidly, and the environment they are in is also complicated, such as the seabed and soil. Oil pipelines are inevitably subject to corrosion in these environments. Corrosion damage to oil pipelines will not only cause economic losses, but also cause environmental disasters or endanger public safety due to crude oil leakage. Therefore, anti-corrosion measures must be taken for oil pipelines. [0003] Electrochemical protection is a method that uses external current to change the metal potential to prevent corrosion. A method that prevents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/14C22C21/10C22C1/02
CPCC22C1/026C22C21/003C22C21/10C23F13/14
Inventor 逯颜军逯彦伟唐彪周旭华宋婕
Owner SHANDONG DERUI ANTI-CORROSION MATERIAL CO LTD
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