An aluminum alloy sacrificial anode material for improving the water/air interface protection effect of sewage storage tanks and its preparation method

An interface protection and sacrificial anode technology, applied in the field of metal corrosion and protection, can solve problems such as the failure to find the protection effect of Al-Zn-In aluminum alloy, the flakes on the surface of the anode, and the poor protection effect, so as to improve the electrochemical performance. Performance, accelerated dissolution, uniform effect of surface corrosion and dissolution

Active Publication Date: 2021-06-01
XI'AN PETROLEUM UNIVERSITY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing typical Al-Zn-In-Cd aluminum alloy sacrificial anode materials produced according to GB / T 4948-2002 "Aluminum-Zinc-Indium Sacrificial Anodes" found that the anode surface flakes off in actual operation and the efficiency is low. Moreover, the protection effect at the water / air interface of the storage tank is not good, and there are still local corrosion and potential instability.
In addition, the Cd element is also a toxic element, and its use is also restricted in some occasions
At present, in the existing aluminum alloy anode patent literature, there is no relevant patent technical record about the protection effect of Al-Zn-In aluminum alloy on the water / air interface or the whole position in the sewage storage tank

Method used

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  • An aluminum alloy sacrificial anode material for improving the water/air interface protection effect of sewage storage tanks and its preparation method
  • An aluminum alloy sacrificial anode material for improving the water/air interface protection effect of sewage storage tanks and its preparation method
  • An aluminum alloy sacrificial anode material for improving the water/air interface protection effect of sewage storage tanks and its preparation method

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preparation example Construction

[0032] The preparation method of the aluminum alloy sacrificial anode material comprises the following steps:

[0033] 1) During the whole process of continuously feeding inert gas for protection, the aluminum ingot with a purity of 99.99% is put into a graphite crucible for melting, and the temperature is raised to a predetermined temperature to completely melt it to obtain molten aluminum;

[0034] 2) After melting and heat preservation for 30~35 minutes, add Zn to the molten aluminum according to the ratio, melt and stir evenly, then add other alloying elements In, Mg and Sn in turn until completely melted, stir gently, then remove slag, and keep warm;

[0035] 3) Finally, cast into a mold and cool to room temperature, so as to prepare the aluminum alloy casting.

[0036] In step (1), the inert gas is nitrogen. The melting temperature is 770°C to 790°C.

[0037] In step (2), the holding time after slag removal is 2-2.5 hours.

[0038] In step (3), the pouring temperature...

Embodiment 1

[0040]First put high-purity aluminum ingots (purity 99.99%) into a graphite crucible melting furnace, raise the temperature to 780°C to melt it into molten aluminum, and then add 3.7% Zn, 0.03% In, 0.45 % Mg, 0.065% Sn, stir evenly, and keep warm for 30min after the temperature rises to 780°C. Then stir and remove the slag. After fully stirring, keep it warm at 780°C for 2 hours to make it uniform. Finally, the melt is poured into the mold at a pouring temperature of 710°C. After the casting is cooled to room temperature, the aluminum alloy casting can be prepared; during the whole smelting process, an inert gas nitrogen is used to protect the melt to reduce the burning loss of alloying elements. After the smelting is completed, the alloy composition of the sample is detected by inductively coupled plasma emission spectrometer (ICP), and the actual chemical composition is basically the same as the design composition.

Embodiment 2

[0042] First put high-purity aluminum ingots (purity 99.99%) into a graphite crucible melting furnace, raise the temperature to 770°C to melt it into molten aluminum, and then add 3.0% Zn, 0.01% In, 0.4 % Mg, 0.01% Sn, stir evenly, and keep warm for 30min after the temperature rises to 770°C. Then stir and remove the slag. After fully stirring, keep it warm at 770°C for 2.2h to make it uniform. Finally, the melt is poured into the mold, and the pouring temperature is 715°C. After the casting is cooled to room temperature, the aluminum alloy casting can be prepared; during the whole smelting process, an inert gas nitrogen is used to protect the melt to reduce the burning loss of alloying elements. After the smelting is completed, the alloy composition of the sample is detected by inductively coupled plasma emission spectrometer (ICP), and the actual chemical composition is basically the same as the design composition.

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Abstract

An aluminum alloy sacrificial anode material for improving the water / air interface protection effect of a sewage storage tank and a preparation method thereof according to the present invention comprise the following components in terms of mass percentage: Zn 3.0-4.0%, In 0.01-0.1%, Mg 0.4-0.5% %, Sn 0.01-0.1%, and the rest is Al. Melt aluminum ingots to obtain molten aluminum, and continuously pass inert gas for protection during the smelting process; after the molten aluminum is kept warm for 30 to 35 minutes, add Zn to the molten aluminum, melt and stir evenly, then add In, Mg and Sn, until completely melted, stirred evenly, removed slag, and kept warm to obtain a mixed solution; the mixed solution was poured into a mold and cooled to room temperature to prepare the aluminum alloy sacrificial anode material. The invention prepares the aluminum alloy material capable of effectively protecting the position of the water / air interface of the sewage storage tank by adding suitable alloy element types and proportions, and dissolves evenly in the sewage storage tank.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion and protection, and relates to an aluminum alloy anode material, in particular to an aluminum alloy sacrificial anode material for improving the water / air interface protection effect of a sewage storage tank and a preparation method thereof. Background technique [0002] Storage tanks play an important role in the storage and transportation of crude oil sewage. However, due to the complex composition of sewage, there are many corrosive ions, and the corrosion of different positions of storage tanks varies greatly. Especially at the water / air interface, the liquid film is discontinuous due to the alternation of dry and wet, resulting in the protection current not reaching the atmospheric area and prone to corrosion. Safety issues such as corrosion-induced perforations are common. Therefore, how to effectively prevent corrosion has become an urgent problem for enterprises to solve. At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/02C23F13/14
CPCC22C1/026C22C21/10C23F13/14
Inventor 周勇周攀虎董会孙良刘彦明
Owner XI'AN PETROLEUM UNIVERSITY
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