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Aluminum alloy sacrificial anode material capable of improving protection effect of water/gas interface of sewage storage tank and preparation method thereof

A technology of interface protection and sacrificial anode, which is applied in the field of metal corrosion and protection, can solve the problems of undetected protection effect of Al-Zn-In aluminum alloy, peeling off of the anode surface, and poor protection effect, so as to improve the electrochemical performance. performance, reduced current efficiency, uniform effect of surface corrosion and dissolution

Active Publication Date: 2020-05-22
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • 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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  • Aluminum alloy sacrificial anode material capable of improving protection effect of water/gas interface of sewage storage tank and preparation method thereof
  • Aluminum alloy sacrificial anode material capable of improving protection effect of water/gas interface of sewage storage tank and preparation method thereof
  • Aluminum alloy sacrificial anode material capable of improving protection effect of water/gas interface of sewage storage tank and preparation method thereof

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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, put an aluminum ingot with a purity of 99.99% into a graphite crucible for melting, and heat it up to a predetermined temperature to completely melt it to obtain liquid aluminum;

[0034] 2) After melting and holding for 30 to 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 is 710°C to 730°C.

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 the high-purity aluminum ingot (purity 99.99%) into the 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

The invention provides an aluminum alloy sacrificial anode material capable of improving the protection effect of a water / gas interface of a sewage storage tank and a preparation method thereof. The aluminum alloy sacrificial anode material comprises, by mass, 3.0-4.0% of Zn, 0.01-0.1% of In, 0.4-0.5% of Mg, 0.01-0.1% of Sn, and the balance Al. The preparation method comprises the steps of smelting an aluminum ingot to obtain molten aluminum and continuously introducing inert gas for protection in the smelting process; conducting heat preservation on the molten aluminum for 30-35 min, adding Zn to the molten aluminum, after melting and even stirring, adding In, Mg and Sn until complete melting, and conducting drossing after even mixing and then heat preservation to obtain mixed liquid; pouring the mixed liquid in a die to be molded, cooling the mixed liquid to the indoor temperature and preparing the aluminum alloy sacrificial anode material. By adding appropriate types of alloy elements at the appropriate ratio, the aluminum alloy material capable of effectively protecting the water / gas interface of the sewage storage tank is prepared, and the aluminum alloy material is dissolveduniformly 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 Applications(China)
IPC IPC(8): C22C21/10C22C1/02C23F13/14
CPCC22C21/10C22C1/026C23F13/14
Inventor 周勇周攀虎董会孙良刘彦明
Owner XI'AN PETROLEUM UNIVERSITY
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